Regensburg 2016 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 4: Spintronics: Nanostructures and Optics
HL 4.5: Vortrag
Montag, 7. März 2016, 10:30–10:45, H13
Spin-orbit coupling effects in nanowires using the k.p method — •Tiago de Campos1,3, Paulo Eduardo Faria Junior1, Guilherme Sipahi1,2, and Jaroslav Fabian3 — 1Universidade de São Paulo — 2State University of New York at Buffalo — 3Universität Regensburg
The search for Majorana fermions is a hot subject nowadays. One of the possibilities for realization of such experiments is a hybrid that couples a nanowire with a s-wave superconductor in the presence of an external magnetic field [1]. To understand the nanowire's role in this setup, we need a realistic band structures including spin-orbit effects. To consider the spin-orbit effects, it is common to use models that take into account only the first conduction band. Although these reduced models have been successfully in determine some physical properties, a more realistic description of the spin-orbit coupling between the bands is required to further investigate possible ways to realize the Majorana fermions. In this study we use a state of the art k.p Hamiltonian, which has the Dresselhaus and Rashba spin-orbit coupling built on the Hamiltonian from the beginning, together with the envelope function approach [2] to determine the band structure of zincblende InSb and wurtzite InAs nanowires. We analyze how the quantum confinement change the coupling between the bands and extracted the effective masses and the spin-splitting parameters that can be used in effective models.
[1] J. Alicea, Rep. Prog. Phys. 75, 076501 (2012). [2] P. E. Faria Junior and G. M. Sipahi, J. Appl. Phys. 112, 103716 (2012).