Project

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High resolution spectroscopy of strongly correlated electron systems and artificial structures at surfaces

Applicant Grioni Marco
Number 162593
Funding scheme Project funding (Div. I-III)
Research institution Institut de Physique des Nanostructures EPFL - FSB - IPN
Institution of higher education EPF Lausanne - EPFL
Main discipline Condensed Matter Physics
Start/End 01.12.2015 - 30.11.2018
Approved amount 751'883.00
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Keywords (6)

strong correlations; ARPES; RIXS; low-dimensional; electronic properties; ultrafast dynamics

Lay Summary (French)

Lead
Nous étudions les propriétés électroniques de nouveau matériaux à l'aide de techniques spectroscopiques avancées
Lay summary

Le but de ce projet est l’étude des propriétés électroniques de nouveaux matériaux qui montrent un intérêt à la fois de nature fondamentale ainsi que pour des applications futures. Dans ces systèmes les interactions électroniques et entre les électrons et le réseau sont en général importantes, ce qui donne lieu à plusieurs instabilités électroniques et à des nouveaux états quantiques de la matière, caractérisés par des propriétés physiques remarquables. Parmi les composés que nous étudierons on trouve les supraconducteurs non-conventionnels, les oxydes des métaux de transitions, les isolants topologiques, le graphène et d’autres matériaux quasi uni- et bidimensionnels.

 

Pour nos techniques spectroscopiques avancées telles que la spectroscopie à très haute résolution des photoélectrons (ARPES) et la diffusion inélastique résonante des rayons X, nous utiliserons des sources de rayonnement synchrotron en Suisse et à l’étranger. A Lausanne nous développerons un équipement de pointe pour des mesures ARPES ultrarapides de type pompe-sonde afin d’étudier la dynamique des électrons et du réseau, ainsi que la formation et la relaxation de nouvelles phases transitoires. Nous utiliserons une nouvelle source d’impulsions ultrarapides dans les domaines UV et des rayons X mous qui est désormais opérationnelle au Centre pour la Spectroscopie Ultrarapide de Lausanne (LACUS).

Direct link to Lay Summary Last update: 25.09.2015

Lay Summary (English)

Lead
We study the electronic properties of novel materials by advanced spectroscopic techniques
Lay summary
The goal of this project is to investigate the electronic properties of novel materials that are interesting both from a fundamental point of view and for future practical applications. These systems typically host strong interactions – among the electrons, between electrons and the lattice – that often lead to electronic instabilities and novel quantum states of matter with unique properties. The compounds that we will consider include novel superconductors; transition metal oxide systems; topological insulators; graphene, and other quasi-one-dimensional and two-dimensional materials.

We will exploit advanced spectroscopic techniques such as high energy resolution photoelectron spectroscopy (ARPES) and resonant inelastic x-ray scattering (RIXS), making extensive use of synchrotron radiation sources worldwide. At Lausanne we will also develop a new state-of-the-art apparatus for ultrafast pump-probe ARPES experiments to study the materials’ electron and lattice dynamics, and the formation and relaxation of new transient phases. To this end we will take advantage of a new source of ultrafast UV and soft x-ray pulses available at the Lausanne Center for Ultrafast Spectroscopy (LACUS).

Direct link to Lay Summary Last update: 25.09.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
Volatile two-dimensional electron gas in ultrathin BaTiO3 films
Lutz Peter, Moser Simon, Jovic Vedran, Chang Young Jun, Koch Roland J., Ulstrup Søren, Oh Ji Seop, Moreschini Luca, Fatale Sara, Grioni Marco, Jozwiak Chris, Bostwick Aaron, Rotenberg Eli, Bentmann Hendrik, Reinert Friedrich (2018), Volatile two-dimensional electron gas in ultrathin BaTiO3 films, in Physical Review Materials, 2(9), 094411-094411.
Kondo lattice excitation observed using resonant inelastic x-ray scattering at the YbM5 edge
Hancock J. N., Dzero M., Sarrao J., Schmitt T., Strocov V., Guarise M., Grioni M. (2018), Kondo lattice excitation observed using resonant inelastic x-ray scattering at the YbM5 edge, in Physical Review B, 98(7), 075158-075158.
Probing band parity inversion in the topological insulator GeBi 2 Te 4 by linear dichroism in ARPES
Sterzi A., Manzoni G., Crepaldi A., Cilento F., Zacchigna M., Leclerc M., Bugnon Ph., Magrez A., Berger H., Petaccia L., Parmigiani F. (2018), Probing band parity inversion in the topological insulator GeBi 2 Te 4 by linear dichroism in ARPES, in Journal of Electron Spectroscopy and Related Phenomena, 225, 23-27.
Reinvestigating the surface and bulk electronic properties of Cd3As2
Roth S., Lee H., Sterzi A., Zacchigna M., Politano A., Sankar R., Chou F. C., Di Santo G., Petaccia L., Yazyev O. V., Crepaldi A. (2018), Reinvestigating the surface and bulk electronic properties of Cd3As2, in Physical Review B, 97(16), 165439-165439.
Dynamics of correlation-frozen antinodal quasiparticles in superconducting cuprates
Cilento Federico, Manzoni Giulia, Sterzi Andrea, Peli Simone, Ronchi Andrea, Crepaldi Alberto, Boschini Fabio, Cacho Cephise, Chapman Richard, Springate Emma, Eisaki Hiroshi, Greven Martin, Berciu Mona, Kemper Alexander F., Damascelli Andrea, Capone Massimo, Giannetti Claudio, Parmigiani Fulvio (2018), Dynamics of correlation-frozen antinodal quasiparticles in superconducting cuprates, in Science Advances, 4(2), eaar1998-eaar1998.
Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K -edge resonant inelastic x-ray scattering
Lu Xingye, Olalde-Velasco Paul, Huang Yaobo, Bisogni Valentina, Pelliciari Jonathan, Fatale Sara, Dantz Marcus, Vale James G., Hunter E. C., Chang Johan, Strocov Vladimir N., Perry R. S., Grioni Marco, McMorrow D. F., Rønnow Henrik M., Schmitt Thorsten (2018), Dispersive magnetic and electronic excitations in iridate perovskites probed by oxygen K -edge resonant inelastic x-ray scattering, in Physical Review B, 97(4), 041102-041102.
Enhanced ultrafast relaxation rate in the Weyl semimetal phase of MoTe2 measured by time- and angle-resolved photoelectron spectroscopy
Crepaldi A., Autès G., Gatti G., Roth S., Sterzi A., Manzoni G., Zacchigna M., Cacho C., Chapman R. T., Springate E., Seddon E. A., Bugnon Ph., Magrez A., Berger H., Vobornik I., Kalläne M., Quer A., Rossnagel K., Parmigiani F., Yazyev O. V., Grioni M. (2017), Enhanced ultrafast relaxation rate in the Weyl semimetal phase of MoTe2 measured by time- and angle-resolved photoelectron spectroscopy, in Physical Review B, 96(24), 241408-241408.
Strongly bound excitons in anatase TiO2 single crystals and nanoparticles
Baldini E., Chiodo L., Dominguez A., Palummo M., Moser S., Yazdi-Rizi M., Auböck G., Mallett B.P.P., Berger H., Magrez A., Bernhard C., Grioni M., Rubio A., Chergui M. (2017), Strongly bound excitons in anatase TiO2 single crystals and nanoparticles, in Nature Communications, 8(1), 13-13.
Electronic and magnetic excitations in the half-stuffed Cu-O planes of Ba2Cu3O4Cl2 measured by resonant inelastic x-ray scattering
Fatale S., Fatuzzo C. G., Babkevich P., Shaik N. E., Pelliciari J., Lu X., McNally D. E., Schmitt T., Kikkawa A., Taguchi Y., Tokura Y., Normand B., Rønnow H. M., Grioni M. (2017), Electronic and magnetic excitations in the half-stuffed Cu-O planes of Ba2Cu3O4Cl2 measured by resonant inelastic x-ray scattering, in Physical Review B, 96(11), 115149-115149.
Preface
Grioni Marco, Yazyev Oleg V. (2017), Preface, in Journal of Electron Spectroscopy and Related Phenomena, 219, 1-1.
Temperature dependent non-monotonic bands shift in ZrTe 5
Manzoni G., Crepaldi A., Autès G., Sterzi A., Cilento F., Akrap A., Vobornik I., Gragnaniello L., Bugnon Ph., Fonin M., Berger H., Zacchigna M., Yazyev O.V., Parmigiani F. (2017), Temperature dependent non-monotonic bands shift in ZrTe 5, in Journal of Electron Spectroscopy and Related Phenomena, 219, 9-15.
Time-resolved ARPES at LACUS: Band Structure and Ultrafast Electron Dynamics of Solids
Crepaldi Alberto, Roth Silvan, Gatti Gianmarco, Arrell ChristopherA., Ojeda José, van Mourik Frank, Bugnon Philippe, Magrez Arnaud, Berger Helmuth, Chergui Majed, Grioni Marco (2017), Time-resolved ARPES at LACUS: Band Structure and Ultrafast Electron Dynamics of Solids, in CHIMIA International Journal for Chemistry, 71(5), 273-277.
Publisher’s Note: Electronic Phase Separation and Dramatic Inverse Band Renormalization in the Mixed-Valence Cuprate LiCu2O2 [Phys. Rev. Lett. 118 , 176404 (2017)]
Moser S., Nomura Y., Moreschini L., Gatti G., Berger H., Bugnon P., Magrez A., Jozwiak C., Bostwick A., Rotenberg E., Biermann S., Grioni M. (2017), Publisher’s Note: Electronic Phase Separation and Dramatic Inverse Band Renormalization in the Mixed-Valence Cuprate LiCu2O2 [Phys. Rev. Lett. 118 , 176404 (2017)], in Physical Review Letters, 118(19), 199902-199902.
Hallmarks of Hunds coupling in the Mott insulator Ca2RuO4
Sutter D., Fatuzzo C. G., Moser S., Kim M., Fittipaldi R., Vecchione A., Granata V., Sassa Y., Cossalter F., Gatti G., Grioni M., Rønnow H. M., Plumb N. C., Matt C. E., Shi M., Hoesch M., Kim T. K., Chang T-R, Jeng H-T, Jozwiak C., Bostwick A., Rotenberg E., Georges A., Neupert T., et al. (2017), Hallmarks of Hunds coupling in the Mott insulator Ca2RuO4, in Nature Communications, 8, 15176-15176.
Bulk diffusive relaxation mechanisms in optically excited topological insulators
Sterzi A., Manzoni G., Sbuelz L., Cilento F., Zacchigna M., Bugnon Ph., Magrez A., Berger H., Crepaldi A., Parmigiani F. (2017), Bulk diffusive relaxation mechanisms in optically excited topological insulators, in Physical Review B, 95(11), 115431-115431.
Persistence of a surface state arc in the topologically trivial phase of MoTe2
Crepaldi A., Autès G., Sterzi A., Manzoni G., Zacchigna M., Cilento F., Vobornik I., Fujii J., Bugnon Ph., Magrez A., Berger H., Parmigiani F., Yazyev O. V., Grioni M. (2017), Persistence of a surface state arc in the topologically trivial phase of MoTe2, in Physical Review B, 95(4), 041408-041408.
An experimentalist's guide to the matrix element in angle resolved photoemission
Moser Simon (2017), An experimentalist's guide to the matrix element in angle resolved photoemission, in Journal of Electron Spectroscopy and Related Phenomena, 214, 29-52.
Evidence for a Strong Topological Insulator Phase in ZrTe5
Manzoni G., Gragnaniello L., Autès G., Kuhn T., Sterzi A., Cilento F., Zacchigna M., Enenkel V., Vobornik I., Barba L., Bisti F., Bugnon Ph., Magrez A., Strocov V. N., Berger H., Yazyev O. V., Fonin M., Parmigiani F., Crepaldi A. (2016), Evidence for a Strong Topological Insulator Phase in ZrTe5, in Physical Review Letters, 117(23), 237601-237601.
Hybridization and electron-phonon coupling in ferroelectric BaTiO3 probed by resonant inelastic x-ray scattering
Fatale S., Moser S., Miyawaki J., Harada Y., Grioni M. (2016), Hybridization and electron-phonon coupling in ferroelectric BaTiO3 probed by resonant inelastic x-ray scattering, in Physical Review B, 94(19), 195131-195131.
Some Like It Flat: Decoupled h-BN Monolayer Substrates for Aligned Graphene Growth
Roth Silvan, Greber Thomas, Osterwalder Jürg (2016), Some Like It Flat: Decoupled h-BN Monolayer Substrates for Aligned Graphene Growth, in ACS Nano, 10(12), 11187-11195.
SmB6 electron-phonon coupling constant from time- and angle-resolved photoelectron spectroscopy
Sterzi A., Crepaldi A., Cilento F., Manzoni G., Frantzeskakis E., Zacchigna M., van Heumen E., Huang Y. K., Golden M. S., Parmigiani F. (2016), SmB6 electron-phonon coupling constant from time- and angle-resolved photoelectron spectroscopy, in Physical Review B, 94(8), 081111-081111.
Nature and topology of the low-energy states in ZrTe5
Moreschini L., Johannsen J. C., Berger H., Denlinger J., Jozwiack C., Rotenberg E., Kim K. S., Bostwick A., Grioni M. (2016), Nature and topology of the low-energy states in ZrTe5, in Physical Review B, 94(8), 081101-081101.
Ultrafast Band Structure Control of a Two-Dimensional Heterostructure
Ulstrup Søren, Čabo Antonija Grubišić, Miwa Jill A., Riley Jonathon M., Grønborg Signe S., Johannsen Jens C., Cacho Cephise, Alexander Oliver, Chapman Richard T., Springate Emma, Bianchi Marco, Dendzik Maciej, Lauritsen Jeppe V., King Phil D. C., Hofmann Philip (2016), Ultrafast Band Structure Control of a Two-Dimensional Heterostructure, in ACS Nano, 10(6), 6315-6322.
Non-Zhang-Rice Singlet Character of the First Ionization State of T-CuO
Adolphs Clemens P. J., Moser Simon, Sawatzky George A., Berciu Mona (2016), Non-Zhang-Rice Singlet Character of the First Ionization State of T-CuO, in Physical Review Letters, 116(8), 087002-087002.
A novel quasi-one-dimensional topological insulator in bismuth iodide β-Bi4I4
Autès Gabriel, Isaeva Anna, Moreschini Luca, Johannsen Jens C., Pisoni Andrea, Mori Ryo, Zhang Wentao, Filatova Taisia G., Kuznetsov Alexey N., Forró László, Van den Broek Wouter, Kim Yeongkwan, Kim Keun Su, Lanzara Alessandra, Denlinger Jonathan D., Rotenberg Eli, Bostwick Aaron, Grioni Marco, Yazyev Oleg V. (2016), A novel quasi-one-dimensional topological insulator in bismuth iodide β-Bi4I4, in Nature Materials, 15(2), 154-158.
Interplay between electronic and structural properties in the Pb/Ag(1 0 0) interface
Crepaldi A, Zhan R R, Moser S, Sheverdyaeva P M, Carbone C, Papagno M, Moras P, Baraldi A, Grioni M (2015), Interplay between electronic and structural properties in the Pb/Ag(1 0 0) interface, in Journal of Physics: Condensed Matter, 27(45), 455502-455502.
Ultrafast Optical Control of the Electronic Properties of ZrTe5
Manzoni G., Sterzi A., Crepaldi A., Diego M., Cilento F., Zacchigna M., Bugnon Ph., Berger H., Magrez A., Grioni M., Parmigiani F. (2015), Ultrafast Optical Control of the Electronic Properties of ZrTe5, in Physical Review Letters, 115(20), 207402-207402.
Electron scattering, charge order, and pseudogap physics in La1.6−xNd0.4SrxCuO4 : An angle-resolved photoemission spectroscopy study
Matt C. E., Fatuzzo C. G., Sassa Y., Månsson M., Fatale S., Bitetta V., Shi X., Pailhès S., Berntsen M. H., Kurosawa T., Oda M., Momono N., Lipscombe O. J., Hayden S. M., Yan J.-Q., Zhou J.-S., Goodenough J. B., Pyon S., Takayama T., Takagi H., Patthey L., Bendounan A., Razzoli E., Shi M., et al. (2015), Electron scattering, charge order, and pseudogap physics in La1.6−xNd0.4SrxCuO4 : An angle-resolved photoemission spectroscopy study, in Physical Review B, 92(13), 134524-134524.
Magnons in tetragonal CuO
Moser S., Shaik N. E., Samal D., Fatale S., Dalla Piazza B., Dantz M., Pelliciari J., Olalde-Velasco P., Schmitt T., Koster G., Mila F., Rønnow H. M., Grioni M. (2015), Magnons in tetragonal CuO, in Physical Review B, 92(14), 140404-140404.
Observation of Ultrafast Free Carrier Dynamics in Single Layer MoS 2
Grubišić Čabo Antonija, Miwa Jill A., Grønborg Signe S., Riley Jonathon M., Johannsen Jens C., Cacho Cephise, Alexander Oliver, Chapman Richard T., Springate Emma, Grioni Marco, Lauritsen Jeppe V., King Phil D. C., Hofmann Philip, Ulstrup Søren (2015), Observation of Ultrafast Free Carrier Dynamics in Single Layer MoS 2, in Nano Letters, 15(9), 5883-5887.
Composition and temperature dependence of the Yb valence in YbMn6Ge6−xSnx studied by RIXS
Mazet T., Malterre D., François M., Eichenberger L., Grioni M., Dallera C., Monaco G. (2015), Composition and temperature dependence of the Yb valence in YbMn6Ge6−xSnx studied by RIXS, in Physical Review B, 92(7), 075105-075105.
Bulk and surface band structure of the new family of semiconductors BiTeX (X=I, Br, Cl)
Moreschini L., Autès G., Crepaldi A., Moser S., Johannsen J.C., Kim K.S., Berger H., Bugnon Ph., Magrez A., Denlinger J., Rotenberg E., Bostwick A., Yazyev O.V., Grioni M. (2015), Bulk and surface band structure of the new family of semiconductors BiTeX (X=I, Br, Cl), in Journal of Electron Spectroscopy and Related Phenomena, 201, 115-120.
Preface
Yeom Han Woong, Grioni Marco (2015), Preface, in Journal of Electron Spectroscopy and Related Phenomena, 201, 2-3.
Magnetic excitations in soft X-ray RIXS: Recent developments
Fatale S., Moser S., Grioni M. (2015), Magnetic excitations in soft X-ray RIXS: Recent developments, in Journal of Electron Spectroscopy and Related Phenomena, 200, 274-281.
Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene
Ulstrup Søren, Johannsen Jens Christian, Cilento Federico, Crepaldi Alberto, Miwa Jill A., Zacchigna Michele, Cacho Cephise, Chapman Richard T., Springate Emma, Fromm Felix, Raidel Christian, Seyller Thomas, King Phil D.C., Parmigiani Fulvio, Grioni Marco, Hofmann Philip (2015), Ramifications of optical pumping on the interpretation of time-resolved photoemission experiments on graphene, in Journal of Electron Spectroscopy and Related Phenomena, 200, 340-346.

Collaboration

Group / person Country
Types of collaboration
ISSP - University of Tokyo Japan (Asia)
- Publication
- Research Infrastructure
Institut fu r Theoretische Physik III, Ruhr-Universita t Bochum Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Advanced Light Source United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Institute for Theoretical Solid State Physics, IFW Dresden Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Central Laser Facility, RAL Great Britain and Northern Ireland (Europe)
- Research Infrastructure
ESRF France (Europe)
- Research Infrastructure
Swiss Light Source, PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure
Aarhus University Denmark (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Politecnico di Milano Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
ELETTRA Trieste Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
- Research Infrastructure

Scientific events

Active participation

Title Type of contribution Title of article or contribution Date Place Persons involved
Réunion thématique GDR MEETICC (invited) Talk given at a conference What can ARPES do for you 15.10.2018 Versailles, France Grioni Marco;
XXI International conference on Ultrafast Phenomena, UP2018 Talk given at a conference trARPES of topological matter 03.09.2018 Hamburg, Germany Crepaldi Alberto;
HoW exciting! 2018 (invited) Talk given at a conference trARPES 06.08.2018 Berlin, Germany Crepaldi Alberto;
From Solid state to Biophysics IX (invited) Talk given at a conference Exploring with (tr)ARPES the topological jungle 16.06.2018 Cavtat, Croatia Grioni Marco;
LACUS Day Talk given at a conference Tr-ARPES at LACUS 14.02.2018 Lausanne, Switzerland Crepaldi Alberto;
Workshop “High-resolution x-ray spectroscopy of quantum materials" (invited) Talk given at a conference ARPES and RIXS studies of unconventional cuprates 07.09.2017 Hsinchu, Taiwan Grioni Marco;
Int’l Conference on Electronic Crystals ECRYS-2017 (invited) Talk given at a conference ARPES and RIXS signatures of electron-lattice coupling in transition metal oxides 28.08.2017 Cargèse, France Grioni Marco;
Workshop Ab-inition correlated methods in spectroscopy (invited) Talk given at a conference Experimental studies of correlated materials by ARPES and RIXS 06.08.2017 Prague, Czech Republic Grioni Marco;
Flatland 2017 Talk given at a conference Time-resolved ARPES 11.07.2017 Lausanne, Switzerland Crepaldi Alberto;
Flatland 2017 Talk given at a conference CVD Graphene Growth on h-BH: The Route Towards High Quality 11.07.2017 Lausanne, Switzerland Roth Siulvan;
MaNEP Workshop on Topological Quantum Phenomena Talk given at a conference Time-resoved ARPES 15.11.2016 Zurich, Switzerland Crepaldi Alberto;
SSP 2016 (invited) Talk given at a conference Spin-split states: from Rashba to topological surface states 23.08.2016 Lugano, Switzerland Grioni Marco;
HoW Exciting 2016 (invited) Talk given at a conference The electronic structure of transition metal oxides probed by high- (and higher) energy spectroscopies 03.08.2016 Berlin, Germany Grioni Marco;
CORPES 2017 Talk given at a conference Time-resolved ARPES 02.07.2016 Hiroshima, Japan Crepaldi Alberto;
Workshop on Resonant Inelastic and Elastic X-Ray Scattering 2016 (invited) Talk given at a conference Soft-RIXS probes electron-lattice coupling in oxides 30.06.2016 Dresden, Germany Grioni Marco;
Ultrafast Dynamics and Time-Resolved Interactions Workshop (invited) Talk given at a conference Time-resolved ARPES 26.06.2016 Szeged , Hungary Crepaldi Alberto;
From Solid State Physics to Biophysics (invited) Talk given at a conference Spin-split states: from Rashba to topological surface states 04.06.2016 Cavtat, Croatia Grioni Marco;
International Conference on Low-Energy Electrodynamics in Solids, LEES 2016 (invited) Talk given at a conference Time-resolved ARPES 29.05.2016 Shiga, Japan Crepaldi Alberto;
2016 Quantum Materials Symposium (invited) Talk given at a conference Spin-split states: from Rashba to topological surface states 22.02.2016 Muui Island, Korean Republic (South Korea) Grioni Marco;
2DLM (invited) Talk given at a conference Investigating the signatures of spin-orbit interaction in layered materials by angle-resolved photoemission (ARPES) 07.01.2016 Hongkong, Hongkong Grioni Marco;
IXS 2015 (invited) Talk given at a conference Magnons in an edge-sharing 2D cuprate: tetragonal CuO 01.12.2015 Hsinchu, Taiwan Grioni Marco;


Associated projects

Number Title Start Funding scheme
149651 High resolution spectroscopy of strongly correlated electron systems and artificial structures at surfaces 01.10.2013 Project funding (Div. I-III)
182035 High resolution spectroscopy of strongly correlated electron systems and artificial structures at surfaces 01.12.2018 Project funding (Div. I-III)
141962 Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials 01.01.2013 Sinergia

Abstract

With this proposal we seek the renewal of the grant that supports the research on electronic properties of novel materials at the Laboratory for Electron spectroscopy of the Institute of Condensed Matter Physics (LSE-ICMP) of the EPFL. The planned scientific activities are based on, and will extend, the successful work performed during the first part (1.5 years; Oct. 2013 - present) of the current grant. We will investigate various kinds of “quantum matter”, i.e. physical systems where quantum effects at the microscopic level yield exceptional macroscopic physical properties. The materials that we will consider include novel superconductors; transition metal oxide systems; topological insulators; graphene, and other quasi-2D materials. We will again exploit advanced spectroscopic probes of the electronic and magnetic structure. High-resolution angle resolved photoemission (ARPES) is our traditional tool, and we will continue to perform ARPES experiments at our home laboratory and at various synchrotron radiation (SR) sources. From resonant inelastic X-ray scattering (RIXS) experiments with synchrotron radiation we will gain a complementary view of the electronic excitations, as well as unique information on the spin dynamics of magnetic systems, such as the cuprate materials. In the next grant period we will further develop activities based on pump-probe time-resolved experiments. These experiments allow us to address the ultrafast dynamics of novel materials, directly in the time domain, and also to investigate interesting and otherwise inaccessible transient phases. We will again use the ARTEMIS laser facility (RAL-Didcot), but will perform the core of the time-resolved ARPES work at a new laser source of ultrafast extreme-UV (EUV) pulses recently commissioned at EPFL. We are also members of an international consortium that will build a unique time-resolved RIXS experiment at the European free-electron laser in Hamburg.Our research depends on the availability of high-quality crystalline samples. In this respect, the long-standing collaboration with the prominent crystal growth laboratory (H. Berger, A. Magrez) of our Institute, specialized in the synthesis of novel materials, is an important asset. As in the past grant period, in particular cases we will grow in situ thin film samples that are not easily obtained, or do not even exist, as bulk crystals. We will also use thin film samples to study specific physical effects - such as the Rashba effect - occurring at surfaces and interfaces. The Institute of Condensed Matter Physics (ICMP) of the EPFL provides an ideal environment for our research. Collaborations with the experimental groups of H. Brune (STM/STS), L. Forro (transport), H. Ronnow (neutrons, magnetism) and F. Carbone (ultrafast dynamics) allow us to address a given physical problem from several different and complementary perspectives. At EPFL we also greatly profit from the theoretical support of O. Yazyev (DFT calculations) and F. Mila (strong correlations). In the new grant period we will also develop a strong collaboration with M. Chergui (Laboratory of Ultrafast Spectroscopy).
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