Search Results - "Ast, C R"

Evidence for superconductivity in Li-decorated monolayer graphene by Ludbrook, B. M., Levy, G., Nigge, P., Zonno, M., Schneider, M., Dvorak, D. J., Veenstra, C. N., Zhdanovich, S., Wong, D., Dosanjh, P., Straßer, C., Stöhr, A., Forti, S., Ast, C. R., Starke, U., Damascelli, A.

“…Monolayer graphene exhibits many spectacular electronic properties, with superconductivity being arguably the most notable exception. It was theoretically…”
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Tracking Primary Thermalization Events in Graphene with Photoemission at Extreme Time Scales by Gierz, I, Calegari, F, Aeschlimann, S, Chávez Cervantes, M, Cacho, C, Chapman, R T, Springate, E, Link, S, Starke, U, Ast, C R, Cavalleri, A

“…Direct and inverse Auger scattering are amongst the primary processes that mediate the thermalization of hot carriers in semiconductors. These two processes…”
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Ambiguity of experimental spin information from states with mixed orbital symmetries by Wissing, S N P, Schmidt, A B, Mirhosseini, H, Henk, J, Ast, C R, Donath, M

“…The spin texture of the unoccupied bands of the surface alloy Bi/Ag(111) is investigated with spin- and angle-resolved inverse photoemission and…”
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A Natural Topological Insulator by Gehring, P, Benia, H. M, Weng, Y, Dinnebier, R, Ast, C. R, Burghard, M, Kern, K

“…The earth’s crust and outer space are rich sources of technologically relevant materials which have found application in a wide range of fields…”
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Long- versus Short-Range Scattering in Doped Epitaxial Graphene by Straßer, C, Ludbrook, B. M, Levy, G, Macdonald, A. J, Burke, S. A, Wehling, T. O, Kern, K, Damascelli, A, Ast, C. R

“…Tuning the electronic properties of graphene by adatom deposition unavoidably introduces disorder into the system, which directly affects the single-particle…”
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Silicon surface with giant spin splitting by Gierz, I, Suzuki, T, Frantzeskakis, E, Pons, S, Ostanin, S, Ernst, A, Henk, J, Grioni, M, Kern, K, Ast, C R

“…We demonstrate a giant Rashba-type spin splitting on a semiconducting substrate by means of a Bi-trimer adlayer on a Si(111) wafer. The in-plane inversion…”
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Influence of the substrate on the spin-orbit splitting in surface alloys on (111) noble-metal surfaces by Moreschini, L., Bendounan, A., Bentmann, H., Assig, M., Kern, K., Reinert, F., Henk, J., Ast, C. R., Grioni, M.

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Dirac fermions and possible weak antilocalization in LaCuSb2 by Chamorro, J. R., Topp, A., Fang, Y., Winiarski, M. J., Ast, C. R., Krivenkov, M., Varykhalov, A., Ramshaw, B. J., Schoop, L. M., McQueen, T. M.

“…Layered heavy-metal square-lattice compounds have recently emerged as potential Dirac fermion materials due to bonding within those sublattices. We report…”
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Thermalization of photoexcited carriers in bismuth investigated by time-resolved terahertz spectroscopy and ab initio calculations by Timrov, I., Kampfrath, T., Faure, J., Vast, N., Ast, C. R., Frischkorn, C., Wolf, M., Gava, P., Perfetti, L.

“…The charge carrier dynamics of photoexcited bismuth generates a Drude response that evolves over time. Our data show that the plasma frequency of bismuth…”
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Assessing the atomic contribution to the Rashba spin-orbit splitting in surface alloys: Sb/Ag(111) by Moreschini, L., Bendounan, A., Gierz, I., Ast, C. R., Mirhosseini, H., Höchst, H., Kern, K., Henk, J., Ernst, A., Ostanin, S., Reinert, F., Grioni, M.

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Scanning tunneling microscopy of two-dimensional semiconductors: Spin properties and disorder by Morgenstern, M., Georgi, A., Straßer, C., Ast, C.R., Becker, S., Liebmann, M.

“…The interrelation between spin and charge in semiconductors leads to interesting effects, e.g., the Rashba-type spin–orbit splitting or the exchange…”
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Fermi surface of Bi(111) measured by photoemission spectroscopy by Ast, C R, Höchst, H

“…Synchrotron radiation angle-resolved photoemission spectroscopy of Bi(111) shows that the Fermi surface consists of six elongated hole pockets along the gamma…”
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Tunneling processes between Yu-Shiba-Rusinov bound states by Villas, A, Klees, R. L, Morrás, G, Huang, H, Ast, C. R, Rastelli, G, Belzig, W, Cuevas, J. C

“…Physical Review B 103, 155407 (2021) Very recent experiments have reported the tunneling between Yu-Shiba-Rusinov (YSR) bound states at the atomic scale. These…”
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Superconducting Quantum Interference at the Atomic Scale by Karan, S, Huang, H, Padurariu, C, Kubala, B, Theiler, A, Black-Schaffer, A, Morrás, G, Yeyati, A. Levy, Cuevas, J. C, Ankerhold, J, Kern, K, Ast, C. R

“…Nat. Phys. 18, 893 (2022) A single spin in a Josephson junction can reverse the flow of the supercurrent. At mesoscopic length scales, such $\pi$-junctions are…”
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New Mechanism for Spin-Orbit Splitting of Conduction States in Surface Alloys by Frantzeskakis, E., Moreschini, L., Falub, M. C., Grioni, M., Pons, S., Ast, C. R., Pacilé, D., Papagno, M.

“…We present Angle-Resolved Photoelectron Spectroscopy (ARPES) data on spin-orbit split states in two XAg2 surface alloys grown on an Ag(111) substrate, and of…”
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Extracting the Rashba splitting from scanning tunneling microscopy measurements by Ast, C.R.

“…The Rashba-type spin-splitting found in many two-dimensional electron systems at surfaces is a band splitting in momentum, which is most easily extracted from…”
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Dirac Fermions and Possible Weak Antilocalization in LaCuSb$_{2} by Chamorro, J. R, Topp, A, Fang, Y, Winiarski, M. J, Ast, C. R, Krivenkov, M, Varykhalov, A, Ramshaw, B. J, Schoop, L, McQueen, T. M

“…APL Materials 7, 121108 (2019) Layered heavy-metal square-lattice compounds have recently emerged as potential Dirac fermion materials due to bonding within…”
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The Fermi surfaces of thin Sb(1 1 1) films by Höchst, Hartmut, Ast, Christian R

“…Angular resolved photoemission spectroscopy is used to map the Fermi surface of Sb(1 1 1). In the region close to the T-point, we find multiple Fermi surface…”
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Final-state band structure-induced modulations of the photoemission linewidth in angle-resolved valence band spectra: a case study on Bi(1 1 1) by Ast, Christian R., Höchst, Hartmut

“…The peak width in angle-resolved photoemission spectra from 3D valence bands in Bi(1 1 1) has been analyzed as a function of final-state energy. Over the…”
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Observation of Dirac surface states in the noncentrosymmetric superconductor BiPd by Benia, H. M, Rampi, E, Trainer, C, Yim, C. M, Maldonado, A, Peets, D. C, Stoehr, A, Starke, U, Kern, K, Yaresko, A, Levy, G, Damascelli, A, Ast, C. R, Schnyder, A. P, Wahl, P

“…Physical Review B 94, 121407 (2016) Materials with strong spin-orbit coupling (SOC) have in recent years become a subject of intense research due to their…”
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