Dresden 2009 – scientific programme

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O: Fachverband Oberflächenphysik

O 41: Ab-initio approaches to excitations in condensed matter I

O 41.10: Talk

Wednesday, March 25, 2009, 17:15–17:30, SCH 251

Stroboscopic wavepacket description of non-equilibrium many-electron problems — •Peter Bokes — Dept. of Physics, Slovak University of Technology FEI STU, Bratislava, Slovakia

We introduce the construction of a orthogonal wavepacket basis set, using the concept of stroboscopic time propagation, tailored to the efficient description of non-equilibrium extended electronic systems. Thanks to three desirable properties of this basis, significant insight is provided into non-equilibrium processes (both time-dependent and steady-state), and reliable physical estimates of various many-electron quantities such as density, current and spin polarization can be obtained. The use of this novel tool is demonstrated for time-dependent switching-on of the bias in quantum transport, and new results are obtained for current-induced spin accumulation at the edge of a 2D doped semiconductor caused by edge-induced spin-orbit interaction.

[1] P. Bokes, F. Corsetti, and R. W. Godby, Phys. Rev. Lett. 101, 046402 (2008)