Zobrazeno 1 - 10 of 201 pro vyhledávání: '"J. Sánchez-Barriga"'
1
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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2
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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3
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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4
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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5
Akademický článek
Nonmagnetic band gap at the Dirac point of the magnetic topological insulator (Bi1−xMnx)2Se3
Autor: J. Sánchez-Barriga, A. Varykhalov, G. Springholz, H. Steiner, R. Kirchschlager, G. Bauer, O. Caha, E. Schierle, E. Weschke, A. A. Ünal, S. Valencia, M. Dunst, J. Braun, H. Ebert, J. Minár, E. Golias, L. V. Yashina, A. Ney, V. Holý, O. Rader
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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6
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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7
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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8
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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10
Lifetime of quasiparticles in the nearly free electron metal sodium
Autor: D. V. Potorochin, R. Kurleto, O. J. Clark, E. D. L. Rienks, J. Sánchez-Barriga, F. Roth, V. Voroshnin, A. Fedorov, W. Eberhardt, B. Büchner, J. Fink
Publikováno v: Repositorio Institucional del Instituto Madrileño de Estudios Avanzados en Nanociencia
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Physical review / B 106(12), 125138 (2022). doi:10.1103/PhysRevB.106.125138
Physical review / B 106(12), 125138 (2022). doi:10.1103/PhysRevB.106.125138
We report a high-resolution angle-resolved photoemission (ARPES) study of the prototypical nearly free-electron metal sodium. The observed mass enhancement is slightly s
Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::dd3e35930a59bc0df11bf65167263e7c
https://doi.org/10.1103/physrevb.106.125138
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