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Fluctuations of boson and fermion condensates

English title Fluctuations of boson and fermion condensates
Applicant Chang Johan Juul
Number 150573
Funding scheme SNSF Professorships
Research institution Physik-Institut Universität Zürich
Institution of higher education University of Zurich - ZH
Main discipline Condensed Matter Physics
Start/End 01.01.2015 - 31.12.2018
Approved amount 1'529'271.00
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Keywords (8)

Electronic surface transport; Fluctuation phenomena; Unconventional superconductivity; Many-body physics; Two-dimensional electron gasses; Thermoelectrics; Strongly correlated electrons; Quantum criticality

Lay Summary (German)

Lead
Im Festkörper kann starke Elektronenwechselwirkung einen dramatischen Einfluss auf dessen elektronische Eigenschaften haben. Faszinierende Phänomene wie Supraleitung und sogar Hochtemperatur-Supraleitung werden unter anderem in diesen so genannten „korrelierte Elektronensystemen“ observiert. Insbesondere die technologisch und physikalisch vielversprechende Hochtemperatur-Supraleitung stellt derzeit eines der wichtigsten ungelösten physikalischen Probleme in der Festkörperphysik.
Lay summary

Inhalt und Ziel des Forschungsprojektes

Das übergeordnete Thema des Projektes ist das Studium von Elektronenleitung in zwei-dimensionalen Systemen. Insbesondere sogenannte Quantenmaterialien – Festkörper welche den Gesetzen der Quantenmechanik unterliegen – werden studiert. Ein Ziel ist ein klarer experimenteller Fall für Phasen-fluktuierende Supraleitung zu identifizieren. Nernst-Effekt Experimente an NbN Filmen werden durchgeführt um dieses Ziel zu erreichen. Das zweite Ziel ist eine neue Art von Experimenten in welchen Oberflächen Elektronenleitung durch Dotierung mit Molekülen kontrolliert werden.

Wissenschaftlicher und gesellschaftlicher Kontext des Forschungsprojektes

Materialien werden immer wichtiger für Technologien. Zum Beispiel benutzen wir Metalle (wie Kupfer) und Halbmetalle (wie Silizium) als elektrische Leiter und elektronische Geräte. Wir werden Experimenten an neuen Materialien, sogenannten Quantenmaterialien durchführen. Mit einem besseren Verständnis der physikalischen und materiellen Eigenschaften können diese für neue Technologien verwendet werden.

 

Direct link to Lay Summary Last update: 21.10.2014

Responsible applicant and co-applicants

Employees

Publications

Publication
Two-dimensional type-II Dirac fermions in layered oxides
Horio M., Matt C. E., Kramer K., Sutter D., Cook A. M., Sassa Y., Hauser K., Månsson M., Plumb N. C., Shi M., Lipscombe O. J., Hayden S. M., Neupert T., Chang J. (2018), Two-dimensional type-II Dirac fermions in layered oxides, in Nature Communications, 9(1), 3252-3252.
Direct observation of orbital hybridisation in a cuprate superconductor
Matt C. E., Sutter D., Cook A. M., Sassa Y., Månsson M., Tjernberg O., Das L., Horio M., Destraz D., Fatuzzo C. G., Hauser K., Shi M., Kobayashi M., Strocov V. N., Schmitt T., Dudin P., Hoesch M., Pyon S., Takayama T., Takagi H., Lipscombe O. J., Hayden S. M., Kurosawa T., Momono N., et al. (2018), Direct observation of orbital hybridisation in a cuprate superconductor, in Nature Communications, 9(1), 972-972.
Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates
Horio M., Hauser K., Sassa Y., Mingazheva Z., Sutter D., Kramer K., Cook A., Nocerino E., Forslund O. K., Tjernberg O., Kobayashi M., Chikina A., Schröter N. B. M., Krieger J. A., Schmitt T., Strocov V. N., Pyon S., Takayama T., Takagi H., Lipscombe O. J., Hayden S. M., Ishikado M., Eisaki H., Neupert T., et al. (2018), Three-Dimensional Fermi Surface of Overdoped La-Based Cuprates, in Physical Review Letters, 121(7), 077004-077004.
Superconducting fluctuations in a thin NbN film probed by the Hall effect
Destraz Daniel, Ilin Konstantin, Siegel Michael, Schilling Andreas, Chang Johan (2017), Superconducting fluctuations in a thin NbN film probed by the Hall effect, in Physical Review B, 95(22), 224501-224501.
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.
Charge-Stripe Order and Superconductivity in Ir1-xPtxTe2
O. Ivashko L. Yang D. Destraz E. Martino Y. Chen C. Y. Guo H. Q. Yuan A. Pisoni P. Matus S., Charge-Stripe Order and Superconductivity in Ir1-xPtxTe2, in Scientific Reportsvolume, 7, 17157.
Damped spin excitations in a doped cuprate superconductor with orbital hybridization
O. Ivashko N. E. Shaik X. Lu C. G. Fatuzzo M. Dantz P. G. Freeman D. E. McNally D. Destraz N, Damped spin excitations in a doped cuprate superconductor with orbital hybridization, in Physical Review B , 95, 214508.

Collaboration

Group / person Country
Types of collaboration
K. Conder & K. Pomkushina Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
J.-S Zhou United States of America (North America)
- in-depth/constructive exchanges on approaches, methods or results
T. Kurosawa & I. Oda Japan (Asia)
- in-depth/constructive exchanges on approaches, methods or results
R. Fittipaldi Italy (Europe)
- in-depth/constructive exchanges on approaches, methods or results
A. Margez & S. Katrych Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
Tadashi Adachi Japan (Asia)
- in-depth/constructive exchanges on approaches, methods or results
S. Hayden Great Britain and Northern Ireland (Europe)
- in-depth/constructive exchanges on approaches, methods or results
R. Liang, D. Bonn & W. Hardy Canada (North America)
- in-depth/constructive exchanges on approaches, methods or results
Simon Gerner Switzerland (Europe)
- in-depth/constructive exchanges on approaches, methods or results

Scientific events



Self-organised

Title Date Place
MaNEP Winter School 14.01.2019 Saas Fee, Switzerland
MaNEP Workshop on Topological Quantum Phenomena 21.11.2016 University of Zurich, Switzerland

Associated projects

Number Title Start Funding scheme
164013 Laser-heated Floating Zone Furnace for EPFL Crystal Growth Facility 01.11.2016 R'EQUIP
160765 Mott Physics Beyond the Heisenberg Model in Iridates and Related Materials 01.01.2016 Sinergia
179097 Electron-Donation for Superconductivity 01.01.2019 SNSF Professorships
155873 Quantum MAny-body Physics in Solids 01.08.2015 Temporary Backup Schemes
142434 Strongly correlated metals beyond the Fermi liquid concept 01.09.2012 Ambizione

Abstract

Materials have long played an important role in the history of mankind. Nowadays, we even categorize some historical periods (stone, iron and bronze age) after the materials that were used. Last century’s physicists developed concepts that allowed harnessing silicon to a degree where computer chips became commercially available. This was the start of an industrial revolution that has dramatically changed the way we live and work. Over the past decades, it has become increasingly clear that there exists a large class of materials / metals, so-called strongly correlated electron systems, that can not be understood by last century’s condensed matter concepts. Similarly a large group of so-called unconventional superconductors have been discovered. Harnessing these materials may have the same impact as silicon had in the last century. Quantum computing, data & energy storage and green technologies are among the sectors that will benefit from progress in material science. This project is concerned with condensed matter phenomena that go beyond established concepts. Fluctuations of superconductivity are a central theme of this research initiative. In particular fluctuations of unconventional superconductivity with strong electron interactions will be investigated. This is an important topic that runs across several physics disciplines such as high-temperature superconductivity, ultra-cold atoms, helium in confined geometries, and particle physics. The study of superconducting fluctuations is intimately linked to one of the most outstanding mysteries of condensed matter physics: namely the problem of high-temperature superconductivity that stands unsolved for more than 25 years.Experimental research in the field of condensed matter physics is, very generally, based on established methods and at the same time on developments of new techniques. This research proposal embodies both aspects. One sub-project uses an established method (Nernst effect) to attack the problem of superconducting fluctuations. The second sub-project on the other hand seeks to develop new types of experiments to enable studies of surface transport experiments.The department of physics at the university of Zurich is going host this project. Two PhD students will be educated through this project and they will be trained in state-of-art instrumentation besides getting a profound insight into the forefront research themes of condensed matter physics. The project diversifies and complements existing research activities in the field of materials with novel electronic properties that already exist in Switzerland.
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