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PGI Colloquium: Prof. Dr. Adam Kaminski, Iowa State University and Ames Laboratory, USA

Online Talk

Please note: You will receive the link to the online talk in the e-mail invitation, usually sent out a few days before the lecture takes place. It is also available on request from the contact person below.

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17 Dec 2021 14:00

Electronic properties of new topological quantum materials

(Please note the change of time to 14:00 CET!)

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Topological materials are characterized by the presence of nontrivial quantum electronic states, where often the electron spin is locked to its momentum. This opens up the possibility for developing new devices in which information is processed or stored by means of spin rather than charge.

The field of topological quantum materials traditionally follows a different paradigm from other areas of Condensed Matter Physics. It is mostly driven by theory and Density Functional Theory calculations in contrast to fields such as superconductivity for example, where new materials are typically discovered by experimentalists. New topological materials and phenomena are usually first discovered in-silico an then confirmed experimentally. Such was the case for topological insulators, crystalline topological insulators and Weyl semimetals.

In this talk we will discuss notable exemptions to this rule and several recent discoveries that were driven by experiment. I will present data from Angle Resolved Photoemission that details fascinating electronic properties of these materials and link these results to some old outstanding problems in more traditional condensed matter physics.

[1] Yun Wu, Daixiang Mou, Na Hyun Jo, Kewei Sun, Lunan Huang, S. L. Bud'ko, P. C. Canfield, and Adam Kaminski,Observation of Fermi arcs in the type-II Weyl semimetal candidate WTe2. Phys. Rev. B 94, 121113(R) (2016)

[2]  Lunan Huang, Timothy M. McCormick, Masayuki Ochi, Zhiying Zhao, Michi-To Suzuki, Ryotaro Arita, Yun Wu, Daixiang Mou, Huibo Cao, Jiaqiang Yan, Nandini Trivedi & Adam Kaminski, Spectroscopic evidence for a type II Weyl semimetallic state in MoTe2. Nature Materials (2016),

[3] Yun Wu, Lin-Lin Wang, Eundeok Mun, D. D. Johnson, Daixiang Mou, Lunan Huang, Yongbin Lee, S. L. Bud’ko, P. C. Canfield & Adam Kaminski, Dirac node arcs in PtSn4. Nature Physics (2016)

[4] Y. Wu, N. H. Jo, L.-L. Wang, C. A. Schmidt, K. M. Neilson, B. Schrunk, P. Swatek, A. Eaton, S. L. Bud'ko, P. C. Canfield, and A. Kaminski, Fragility of Fermi arcs in Dirac semimetals, Phys. Rev. B 99, 161113(R) (2019).

[5] Kyungchan Lee, Gunnar F. Lange, Lin-Lin Wang, Brinda Kuthanazhi, Thais V. Trevisan, Na Hyun Jo, Benjamin Schrunk, Peter P. Orth, Robert-Jan Slager, Paul C. Canfield, Adam Kaminski, Discovery of a weak topological insulating state and van Hove singularity in triclinic RhBi2, Nat. Comms. 12, 1855 (2021)

[6] Na Hyun Jo, Yun Wu, Tha’is V. Trevisan, Lin-Lin Wang, Kyungchan Lee, Brinda Kuthanazhi, Benjamin Schrunk, S. L. Bud'ko, P. C. Canfield, P. P. Orth, and Adam Kaminski, Visualizing band selective enhancement of quasiparticle lifetime in a metallic ferromagnet, Nat. Comms. – in print.

Contact

Dr. Daniel Bürgler

Phone: +49 2461 61-4214
Fax: +49 2461 61-4443
email: d.buergler@fz-juelich.de

Dr. Lukasz Plucinski

Phone: +49 2461 61-6684
email: l.plucinski@fz-juelich.de