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Geometrical and electronic structure at and near surfaces

English title Geometrical and electronic structure at and near surfaces
Applicant Aebi Philipp
Number 159753
Funding scheme Project funding
Research institution Département de Physique Université de Fribourg
Institution of higher education University of Fribourg - FR
Main discipline Condensed Matter Physics
Start/End 01.04.2015 - 31.05.2019
Approved amount 561'908.00
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Keywords (8)

transition metal dichalcogenides; Surfaces; low dimensional systems; angle-resolved photoemission; low energy electron diffraction; scanning tunneling microscopy and spectroscopy; Fermi surface mapping; Oxide-based materials

Lay Summary (German)

Lead
Bei diesem Projekt geht es um Grundlagenforschung auf dem Gebiet der Elektronenstruktur und der Anordnung der Atome im Festkörper und an Oberflächen. Das Hauptziel ist es neues Wissen zu kreieren und ein besseres quantenmechanisches Verständnis über Prozesse im sub-nanometer Bereich zu erarbeiten. Forschung auf diesem Gebiet ist höchst relevant für Entwicklungen im Bereich neuer Materialien.
Lay summary

Inhalt und Ziel

 

Wir werden winkelaufgelöste Photoemissions- und Rastertunnelmikroskopie / Spektroskopie Experimente an einkristallinen Materialien machen. Die Experimente finden im Ultrahochvakuum statt da sie extrem oberflächenempfindlich sind. Messungen werden mit Festkörperrechungen basierend auf der Quantenmechanik komplettiert. Die Photoemission erlaubt es durch das Messen der Winkelverteilung der emittierten Elektronen herauszufinden wie die Elektronen im Material verteilt sind (in Energie und Impuls). Dies ist wichtig weil die Elektronenverteilung die Eigenschaften des Materials bestimmt. Da die Elektronen auf ihrem Weg ins Vakuum an den Atomen des Kristalls streuen, entsteht ein Interferenzmuster das zur Untersuchung der Atompositionen benutzt werden kann. Die Rastertunnelmikroskopie und Spektroskopie erlaubt ebenfalls das Untersuchen der Elektronenstruktur, dies aber sehr lokal (Nanometer) im Gegensatz zur Photoemission wo über einen grösseren Bereich (Millimeter) gemittelt wird. Die beiden Methoden sind daher komplementär. Das Ziel ist es besser zu Verstehen was der Grund ist, dass Atome sich in einer gewissen Struktur anordnen oder dass ein Phasenübergang stattfindet.

 

Wissenschaftlicher und gesellschaftlicher Kontext

 

Unsere Arbeit liefert neue Ergebnisse im fundamentalen Verständnis der kondensierten Materie. Es geht darum neues Wissen zu kreieren das aber nicht sofort zu neuen Anwendungen führt. Wichtig ist auch das Training der Mitarbeiter im Arbeiten mit komplexen Instrumenten und Problemen. Dies ist in jeder hochqualifizierten, zukünftigen Arbeitsstelle von grossem gesellschaftlichen Nutzen. 

 

Direct link to Lay Summary Last update: 31.03.2015

Responsible applicant and co-applicants

Employees

Publications

Publication
Semimetal-to-semiconductor transition and charge-density-wave suppression in 1T−TiSe2−xSx single crystals
Mottas M.-L., Jaouen T., Hildebrand B., Rumo M., Vanini F., Razzoli E., Giannini E., Barreteau C., Bowler D. R., Monney C., Beck H., Aebi P. (2019), Semimetal-to-semiconductor transition and charge-density-wave suppression in 1T−TiSe2−xSx single crystals, in Physical Review B, 99(15), 155103-155103.
Local Real-Space View of the Achiral 1T−TiSe22×2×2 Charge Density Wave
Hildebrand B., Jaouen T., Mottas M.-L., Monney G., Barreteau C., Giannini E., Bowler D. R., Aebi P. (2018), Local Real-Space View of the Achiral 1T−TiSe22×2×2 Charge Density Wave, in Physical Review Letters, 120(13), 136404-136404.
Robustness of the charge-ordered phases in IrTe2 against photoexcitation
Monney C., Schuler A., Jaouen T., Mottas M.-L., Wolf Th., Merz M., Muntwiler M., Castiglioni L., Aebi P., Weber F., Hengsberger M. (2018), Robustness of the charge-ordered phases in IrTe2 against photoexcitation, in Physical Review B, 97(7), 075110-075110.
A Ga-doped SnO 2 mesoporous contact for UV stable highly efficient perovskite solar cells
Roose Bart, Johansen Christian M., Dupraz Kevin, Jaouen Thomas, Aebi Philipp, Steiner Ullrich, Abate Antonio (2018), A Ga-doped SnO 2 mesoporous contact for UV stable highly efficient perovskite solar cells, in Journal of Materials Chemistry A, 6(4), 1850-1857.
Rotation symmetry breaking in La2−xSrxCuO4 revealed by angle-resolved photoemission spectroscopy
Razzoli E., Matt C. E., Sassa Y., Månsson M., Tjernberg O., Drachuck G., Monomo M., Oda M., Kurosawa T., Huang Y., Plumb N. C., Radovic M., Keren A., Patthey L., Mesot J., Shi M. (2017), Rotation symmetry breaking in La2−xSrxCuO4 revealed by angle-resolved photoemission spectroscopy, in Physical Review B, 95(22), 224504-224504.
Selective Probing of Hidden Spin-Polarized States in Inversion-Symmetric Bulk MoS2
Razzoli E., Jaouen T., Mottas M.-L., Hildebrand B., Monney G., Pisoni A., Muff S., Fanciulli M., Plumb N. C., Rogalev V. A., Strocov V. N., Mesot J., Shi M., Dil J. H., Beck H., Aebi P. (2017), Selective Probing of Hidden Spin-Polarized States in Inversion-Symmetric Bulk MoS2, in Physical Review Letters, 118(8), 086402-086402.
Band Bending in Mg-Colored and O 2 -Activated Ultrathin MgO(001) Films
Jaouen T., Hildebrand B., Aebi P., Delhaye G., Tricot S., Lépine B., Jézéquel G., Schieffer P. (2017), Band Bending in Mg-Colored and O 2 -Activated Ultrathin MgO(001) Films, in The Journal of Physical Chemistry C, 121(8), 4363-4367.
Local resilience of the 1T−TiSe2 charge density wave to Ti self-doping
Hildebrand B., Jaouen T., Didiot C., Razzoli E., Monney G., Mottas M.-L., Vanini F., Barreteau C., Ubaldini A., Giannini E., Berger H., Bowler D. R., Aebi P. (2017), Local resilience of the 1T−TiSe2 charge density wave to Ti self-doping, in Physical Review B, 95(8), 081104-081104.
Surface science at the PEARL beamline of the Swiss Light Source
Muntwiler Matthias, Zhang Jun, Stania Roland, Matsui Fumihiko, Oberta Peter, Flechsig Uwe, Patthey Luc, Quitmann Christoph, Glatzel Thilo, Widmer Roland, Meyer Ernst, Jung Thomas A., Aebi Philipp, Fasel Roman, Greber Thomas (2017), Surface science at the PEARL beamline of the Swiss Light Source, in Journal of Synchrotron Radiation, 24(1), 354-366.
Short-range phase coherence and origin of the 1T−TiSe2 charge density wave
Hildebrand B., Jaouen T., Didiot C., Razzoli E., Monney G., Mottas M.-L., Ubaldini A., Berger H., Barreteau C., Beck H., Bowler D. R., Aebi P. (2016), Short-range phase coherence and origin of the 1T−TiSe2 charge density wave, in Physical Review B, 93(12), 125140-125140.
Evolution of the charge density wave superstructure in ZrTe3 under pressure
Hoesch Moritz, Garbarino Gaston, Battaglia Corsin, Aebi Philipp, Berger Helmuth (2016), Evolution of the charge density wave superstructure in ZrTe3 under pressure, in Physical Review B, 93(12), 125102-125102.
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.
Scanning tunneling microscopy of the charge density wave in 1T−TiSe2 in the presence of single atom defects
Novello A. M., Hildebrand B., Scarfato A., Didiot C., Monney G., Ubaldini A., Berger H., Bowler D. R., Aebi P., Renner Ch. (2015), Scanning tunneling microscopy of the charge density wave in 1T−TiSe2 in the presence of single atom defects, in Physical Review B, 92(8), 081101-081101.
Tuning the metal-insulator transition in NdNiO3 heterostructures via Fermi surface instability and spin fluctuations
Dhaka R. S., Das Tanmoy, Plumb N. C., Ristic Z., Kong W., Matt C. E., Xu N., Dolui Kapildeb, Razzoli E., Medarde M., Patthey L., Shi M., Radović M., Mesot Joël (2015), Tuning the metal-insulator transition in NdNiO3 heterostructures via Fermi surface instability and spin fluctuations, in Physical Review B, 92(3), 035127-035127.
Three-dimensional momentum-resolved electronic structure of 1T−TiSe2: A combined soft-x-ray photoemission and density functional theory study
Vydrova Z., Schwier E. F., Monney G., Jaouen T., Razzoli E., Monney C., Hildebrand B., Didiot C., Berger H., Schmitt T., Strocov V. N., Vanini F., Aebi P. (2015), Three-dimensional momentum-resolved electronic structure of 1T−TiSe2: A combined soft-x-ray photoemission and density functional theory study, in Physical Review B, 91(23), 235129-235129.
Tuning electronic correlations in transition metal pnictides: Chemistry beyond the valence count
Razzoli E., Matt C. E., Kobayashi M., Wang X.-P., Strocov V. N., van Roekeghem A., Biermann S., Plumb N. C., Radovic M., Schmitt T., Capan C., Fisk Z., Richard P., Ding H., Aebi P., Mesot J., Shi M. (2015), Tuning electronic correlations in transition metal pnictides: Chemistry beyond the valence count, in Physical Review B, 91(21), 214502-214502.

Collaboration

Group / person Country
Types of collaboration
Ch. Renner, E. Giannini, UniGe Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
C. Bernhard, UniFR Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
C. Monney, Fritz-Haber, Berlin, Ambizione UniZH Germany (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
R. Fasel, empa Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
A. Magrez, H. Berger, L. Forro, EPFL Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Th. Schmitt, PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
D. Bowler, London Centre for Nanotechnology Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
Th. Greber, J. Osterwalder, UniZh Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Ph. Schieffer, G. Jézéquel, IPR, Rennes France (Europe)
- in-depth/constructive exchanges on approaches, methods or results
- Publication
M. Muntwiler, Th. Jung, PSI Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results

Awards

Title Year
Chorafas Prize 2018, https://www.weizmann.ac.il/feinberg/about/dimitris-n-chorafas-prize/about-foundation-and-prize 2018

Associated projects

Number Title Start Funding scheme
147198 Geometrical and electronic structure at and near surfaces 01.04.2013 Project funding
147198 Geometrical and electronic structure at and near surfaces 01.04.2013 Project funding
128686 Towards a more bulk sensitive photoemission experiment 01.06.2010 R'EQUIP

Abstract

Context and significance:The project focuses on fundamental physics concerning the atomic and electronic structure. The main goal is to create new knowledge and better understanding on the quantum mechanics and sub-nanometer level of how electrons and atoms are organized in solids and near surfaces. In particular, the results lead to new views and explanations on the mechanisms behind the extremely variable properties of new and old materials used in various devices and applications. Research in this field is crucial for all developments in relation with new materials. Scientific frame and methodology:In the present project angle-resolved photoemission and scanning tunneling microscopy and spectroscopy experiments are done. These experiments allow a very detailed investigation of the “organization” of electrons and atoms at the surface and close to it. However, these experiments require well-defined surfaces of the materials under study and stringent vacuum conditions.
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