Ballistic quantum transport at high energies and high magnetic fields

Details Ballistic quantum transport at high energies and high magnetic fields Ballistic quantum transport at high energies and high magnetic fields

2003-04-10

arxiv.org/abs/cond-mat/0304247v1

Phys. Rev. B 68, 165302 (2003)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

20 pages, 10 figures, to appear in Phys.Rev.B

Scientific paper

10.1103/PhysRevB.68.165302

We present an extension of the modular recursive Green's function method (MRGM) for ballistic quantum transport to include magnetic fields. Dividing the non-separable two-dimensional scattering problem into separable substructures allows us to calculate transport coefficients and scattering wavefunctions very efficiently. Previously unattainable energy and magnetic field regions can thereby be covered with high accuracy. The method is applied to magnetotransport through a circle and a stadium shaped quantum dot at strong magnetic fields and high energies. In the edge state regime we observe strong multi-frequency Aharonov-Bohm oscillations. By analyzing them in terms of a multi-channel interference model, we classify these fluctuations within the framework of Fano resonances and discuss their geometry independence. For high energies (mode numbers) we observe localization of the scattering wavefunction near classical trajectories.

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