Workshop book - Physikzentrum der RWTH Aachen - RWTH Aachen ...

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Posters Tuesday February 5 Poster 30: Topological edge states in a HgTe quantum well in proximity to an s-wave superconductor Luzie Weithofer Topological insulators represent a new class of condensed matter systems which are characterized by topologically protected edge states. Two-dimensional topological insulators have been experimentally realized in HgTe quantum wells [1]. In a HgTe quantum well in the topologically non-trivial phase, two edge states of different spin propagate in opposite directions at the same boundary. Here, we consider the proximity-induced superconductivity in the bulk of a HgTe quantum well in terms of a four-band model [2]. In addition, we include various symmetry-breaking terms and discuss their consequences on the topological properties of the system, focusing on the existence of edge states. [1] M. König et al., Science 318, 766 (2007) [2] B. Bernevig et al., Science 314, 1757 (2006) Poster 31: z→−z Symmetry of Spin-Orbit Coupling and Weak Localization in Graphene Vladimir Falko We show that the influence of spin-orbit (SO) coupling on the weak-localization effect for electrons in graphene depends on the lack or presence of z→−z symmetry in the system. While, for z→−z asymmetric SO coupling, disordered graphene should display a weak antilocalization behavior at lowest temperature, z→−z symmetric coupling leads to an effective saturation of decoherence time which can be partially lifted by an in-plane magnetic field, thus tending to restore the weak-localization effect. 78
Posters Tuesday February 5 Poster 32: Intrinsic and substrate induced spin-orbit interaction in chirally stacked trilayer graphene Andor Kormanyos We present a combined group-theoretical and tight-binding approach to calculate the intrinsic spin-orbit coupling (SOC) in ABC stacked trilayer graphene. As a special case of our calculations we also consider the intrinsic SOC in bilayer graphene. The comparison between our tight-binding bilayer results and the density functional computations of Konschuh et. al. allows us to estimate the values of the trilayer SOC parameters as well. We also discuss the situation when a substrate or adatoms induce strong SOC in only one of the layers of bilayer or ABC trilayer graphene. Both for the case of intrinsic and externally induced SOC we derive effective Hamiltonians which describe the low-energy spin-orbit physics. We find that at the K point of the Brillouin zone the effect of Bychkov-Rashba type SOC is suppressed in bilayer and ABC trilayer graphene compared to monolayer graphene. Poster 33: Spin-orbit induced strong coupling of a single spin to a nanomechanical resonator Andras Palyi We theoretically investigate the spin-orbit-induced coupling of an electron spin to a bending vibrational mode in suspended carbon nanotube quantum dots. Our estimates indicate that, with current capabilities, a quantum dot with an odd number of electrons can serve as a realization of the Jaynes- Cummings model of quantum electrodynamics in the strong-coupling regime. A bending mode of the suspended tube plays the role of the optical mode and we identify two distinct two-level subspaces, at small and large magnetic field, which can be used as qubits in this setup. The strong intrinsic spin-mechanical coupling allows for detection, as well as manipulation of the spin qubit, and may yield enhanced performance of nanotubes in sensing applications. Reference: A. Palyi, P. R. Struck, M. Rudner, K. Flensberg and G. Burkard, Phys. Rev. Lett. 108, 206811 (2012) 79
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PROGRAM BOOK International workshop
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What comes with this booklet With t
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Getting to the institute (1) If you
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Workshop lecture hall • The works
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Lunch information Lunch will be tak
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Talks Monday February 4 Talk progra
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Talks Monday February 4 Notes 13
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Workshop book - Physikzentrum der RWTH Aachen - RWTH Aachen ...

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