SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 49: Quantum dots: Devices
HL 49.4: Vortrag
Freitag, 31. März 2023, 10:15–10:30, POT 151
Higher order effective coefficients in Ge/Si core/shell nanowire devices — •Sebastian Miles1,2, Piotr Rozek1,2, Mert Bozkurt1,2, Dániel Varjas3, and Michael Wimmer1,2 — 1QuTech, Delft University of Technology, Delft 2600 GA, The Netherlands — 2Kavli Institute of Nanoscience, Delft University of Technology, Delft 2600 GA, The Netherlands — 3Max-Planck-Institut für Physik komplexer Systeme, 01187 Dresden, Germany
Germanium based nanowires are prominent platforms in mesoscopic physics because of their tunable spin-orbit interaction. This property makes them an interesting candidate for hole-qubit devices or as a platform for Majoranas. Hence, a good understanding of effective models for the relevant degrees of freedom in these devices is of great importance. We revisit the subject of effective Hamiltonians and effective coefficients for efficient nano-device control in Ge/Si core/shell semiconductor nanowires from a perturbation theory perspective. We elaborate on relevant terms and present numerical and semi-analytical results of Lowdin perturbation theory to second order. We discuss the consequences of higher order terms on the effective models of interest for device applications.