Publications (13)
Ferrimagnetic nanostructures for magnetic memory bits
A. A. Ãnal, S. Valencia, D. Marchenko +4
Increasing the magnetic data recording density requires reducing the size of the individual memory elements of a recording layer as well as employing magnetic materials with temper…
Absence of Giant Spin Splitting in the Two-Dimensional Electron Liquid at the Surface of SrTiO (001)
S. McKeown Walker, S Riccò, F. Y. Bruno +10
We reinvestigate the putative giant spin splitting at the surface of SrTiO reported by Santander-Syro [Nature Mat. 13, 1085 (2014)]. Our spin- and angle-resolved photo…
Tolerance of topological surface states towards magnetic moments: Fe on Bi2Te3 and Bi2Se3
M. R. Scholz, J. Sánchez-Barriga, D. Marchenko +4
Topological insulators(1-8) are a novel form of matter which features metallic surface states with quasirelativistic dispersion similar to graphene(9). Unlike graphene, the locking…
Anisotropic effect of warping on the lifetime broadening of topological surface states in angle-resolved photoemission from BiTe
J. Sánchez-Barriga, M. R. Scholz, E. Golias +5
We analyze the strong hexagonal warping of the Dirac cone of BiTe by angle-resolved photoemission. Along , the dispersion deviates from a lin…
High spin polarization and circular dichroism of topological surface states on Bi2Te3
M. R. Scholz, J. Sánchez-Barriga, D. Marchenko +4
Topological insulators have been successfully identified by spin-resolved photoemission but the spin polarization remained low (~20%). We show for Bi2Te3 that the in-gap surface st…
Evolution of remnant Fermi surface state in lightly-doped correlated spin-orbit insulator SrLaIrO
K. Terashima, M. Sunagawa, H. Fujiwara +14
Electronic structure has been studied in lightly electron doped correlated spin-orbit insulator SrIrO by angle-resolved photoelectron spectroscopy. We have observed coexist…
Reversal of the circular dichroism in the angle-resolved photoemission from Bi2Te3
M. R. Scholz, J. Sánchez-Barriga, J. Braun +11
The helical Dirac fermions at the surface of topological insulators show a strong circular dichroism which has been explained as being due to either the initial-state spin angular…
Topological surface state under graphene for two-dimensional spintronics in air
A. Varykhalov, D. Marchenko, M. R. Scholz +3
Spin currents which allow for a dissipationless transport of information can be generated by electric fields in semiconductor heterostructures in the presence of a Rashba-type spin…
Graphene for spintronics: giant Rashba splitting due to hybridization with Au
D. Marchenko, A. Varykhalov, M. R. Scholz +5
Graphene in spintronics has so far primarily meant spin current leads of high performance because the intrinsic spin-orbit coupling of its pi-electrons is very weak. If a large spi…
Rashba splitting of 100 meV in Au-intercalated graphene on SiC
D. Marchenko, A. Varykhalov, J. Sánchez-Barriga +2
Intercalation of Au can produce giant Rashba-type spin-orbit splittings in graphene but this has not yet been achieved on a semiconductor substrate. For graphene/SiC(0001), Au inte…
Search for enhanced magnetism at the interface between BiSe and EuSe
K. Prokeš, Chen Luo, H. Ryll +8
Enhanced magnetism has recently been reported for the topological-insulator/ferromagnet interface BiSe/EuS with Curie temperatures claimed to be raised above room temperatu…
Suppression of electron scattering resonances in graphene by quantum dots
M. Krivenkov, D. Marchenko, J. Sánchez-Barriga +2
Transmission of low-energetic electrons through two-dimensional materials leads to unique scattering resonances. These resonances contribute to photoemission from occupied bands wh…
Tunneling Tuned Spin Modulations in Ultrathin Topological Insulator Films
M. Neupane, A. Richardella, J. Sanchez-Barriga +18
Quantitative understanding of the relationship between quantum tunneling and Fermi surface spin polarization is key to device design using topological insulator surface states. By…