Dresden 2011 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 40: Topological Insulators (jointly with HL, MA)

TT 40.10: Talk

Wednesday, March 16, 2011, 19:00–19:15, HSZ 04

Wave-packet transport in HgTe — •Viktor Krueckl and Klaus Richter — Institut für Theoretische Physik, Universität Regensburg, 93040 Regensburg, Germany

Recent experiments have shown the Quantum Spin Hall State in mercury telluride quantum wells and the associated edge channel transport at zero external magnetic field [1]. We employ a four band model to investigate the propagation of such topological edge state wave-packets in the gap, as well as bulk states in the conducting region. Our recently developed algorithm is able to solve the time-dependent scattering problem for arbitrary scattering potentials and gives revealing insight into the occurring edge phenomena. The obtained time evolution of the wavefunction is used to calculate the complete energy dependent scattering matrix for a time-independent Hamiltonian. With this we investigate the transport in different mesoscopic setups and are particularly interested in the scattering of edge states at constrictions.

[1] A. Roth, C. Brüne, H. Buhmann, L. W. Molenkamp, J. Maciejko, X.-L. Qi and S.-C. Zhang, Science 325, 294 (2009)