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Akademický článek

Robust behavior and spin-texture stability of the topological surface state in Bi2Se3 upon deposition of gold

Autor: O. J. Clark, F. Freyse, L. V. Yashina, O. Rader, J. Sánchez-Barriga

Publikováno v: npj Quantum Materials, Vol 7, Iss 1, Pp 1-7 (2022)

Abstract The Dirac point of a topological surface state (TSS) is protected against gapping by time-reversal symmetry. Conventional wisdom stipulates, therefore, that only through magnetisation may a TSS become gapped. However, non-magnetic gaps have

Externí odkaz: https://doaj.org/article/3a5846a6efd5416689ddd9389c75e47a

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Akademický článek

Lifshitz transition in titanium carbide driven by a graphene overlayer

Autor: M. Krivenkov, D. Marchenko, E. Golias, M. Sajedi, A. S. Frolov, J. Sánchez-Barriga, A. Fedorov, L. V. Yashina, O. Rader, A. Varykhalov

Publikováno v: Physical Review Research, Vol 5, Iss 2, p 023120 (2023)

Two-dimensional (2D) Dirac materials are electronically and structurally very sensitive to proximity effects. We demonstrate, however, the opposite effect: that the deposition of a monolayer 2D material could exercise a substantial influence on the s

Externí odkaz: https://doaj.org/article/5b24fac91e0e4761be8c1589bc34f69b

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Akademický článek

Samarium hexaboride is a trivial surface conductor

Autor: P. Hlawenka, K. Siemensmeyer, E. Weschke, A. Varykhalov, J. Sánchez-Barriga, N. Y. Shitsevalova, A. V. Dukhnenko, V. B. Filipov, S. Gabáni, K. Flachbart, O. Rader, E. D. L. Rienks

Publikováno v: Nature Communications, Vol 9, Iss 1, Pp 1-7 (2018)

Samarium hexahoride is argued to be a topological Kondo insulator, but this claim remains under debate. Here, Hlawenka et al. provide a topologically trivial explanation for the conducting states at the (100) surface of samarium hexaboride; an explan

Externí odkaz: https://doaj.org/article/f28f822dd1b94bb882e54e1328f0a9f8

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Akademický článek

Giant Magnetic Band Gap in the Rashba-Split Surface State of Vanadium-Doped BiTeI: A Combined Photoemission and Ab Initio Study

Autor: I. I. Klimovskikh, A. M. Shikin, M. M. Otrokov, A. Ernst, I. P. Rusinov, O. E. Tereshchenko, V. A. Golyashov, J. Sánchez-Barriga, A. Yu. Varykhalov, O. Rader, K. A. Kokh, E. V. Chulkov

Publikováno v: Scientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)

Abstract One of the most promising platforms for spintronics and topological quantum computation is the two-dimensional electron gas (2DEG) with strong spin-orbit interaction and out-of-plane ferromagnetism. In proximity to an s-wave superconductor,

Externí odkaz: https://doaj.org/article/abf4fcb9e3b74456950d5504b2fb071c

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Akademický článek

Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3

Publikováno v: Nature Communications, Vol 7, Iss 1, Pp 1-10 (2016)

Doping a topological insulator with magnetic impurities is expected to induce ferromagnetism and open a band gap in its surface states. Here, the authors study Mn-doped Bi2Se3, finding a mechanism for band gap opening in topologically-protected surfa

Externí odkaz: https://doaj.org/article/bab09ea8531545da888263a8c825ac3d

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Akademický článek

Effective mass enhancement and ultrafast electron dynamics of Au(111) surface state coupled to a quantum well

Autor: A. Varykhalov, F. Freyse, I. Aguilera, M. Battiato, M. Krivenkov, D. Marchenko, G. Bihlmayer, S. Blügel, O. Rader, J. Sánchez-Barriga

Publikováno v: Physical Review Research, Vol 2, Iss 1, p 013343 (2020)

We show that, although the equilibrium band dispersion of the Shockley-type surface state of two-dimensional Au(111) quantum films grown on W(110) does not deviate from the expected free-electron-like behavior, its nonequilibrium energy-momentum disp

Externí odkaz: https://doaj.org/article/2326657785b647278a95fd1afa74975c

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Akademický článek

Photoemission of Bi_{2}Se_{3} with Circularly Polarized Light: Probe of Spin Polarization or Means for Spin Manipulation?

Autor: J. Sánchez-Barriga, A. Varykhalov, J. Braun, S.-Y. Xu, N. Alidoust, O. Kornilov, J. Minár, K. Hummer, G. Springholz, G. Bauer, R. Schumann, L. V. Yashina, H. Ebert, M. Z. Hasan, O. Rader

Publikováno v: Physical Review X, Vol 4, Iss 1, p 011046 (2014)

Topological insulators are characterized by Dirac-cone surface states with electron spins locked perpendicular to their linear momenta. Recent theoretical and experimental work implied that this specific spin texture should enable control of photoele

Externí odkaz: https://doaj.org/article/1e8e1a2e40b54c7e80fe77a66cb57fc7

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Akademický článek

Intact Dirac Cones at Broken Sublattice Symmetry: Photoemission Study of Graphene on Ni and Co

Autor: A. Varykhalov, D. Marchenko, J. Sánchez-Barriga, M. R. Scholz, B. Verberck, B. Trauzettel, T. O. Wehling, C. Carbone, O. Rader

Publikováno v: Physical Review X, Vol 2, Iss 4, p 041017 (2012)

The appearance of massless Dirac fermions in graphene requires two equivalent carbon sublattices of trigonal shape. While the generation of an effective mass and a band gap at the Dirac point remains an unresolved problem for freestanding extended gr

Externí odkaz: https://doaj.org/article/8074dd74e3f84ba68f2b2a70a2c422c7

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Akademický článek

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