Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.53: Poster
Dienstag, 10. März 2026, 18:00–20:00, P1
Andreev Spin Qubits in Hole-Gas Based Nanowires with Mixed Superconducting Pairing — •Markus Plautz — Norwegian University of Science and Technology, Norway
Ge-based lower-dimensional hole gases proximitized by superconductors represent a promising platform for future quantum technologies, largely related to the complicated p-wave nature of the orbital wavefunctions of the valence band. While standard models often treat the induced superconductivity as purely s-wave, recent microscopic theories indicate that the proximity effect in these systems is far more complex. They reveal that the strong spin-orbit interaction can induce non-trivial mixed pairing correlations, featuring coexisting s- and p-wave terms.
We calculate the Andreev reflection phases and determine the Andreev bound state (ABS) energy spectrum in the presence of Zeeman and spin-orbit fields. In particular, we show how these odd-parity correlations influence the spin splitting, leading to distinct changes in the qubit energy levels. Furthermore, we discuss the coherent control of the qubit subspace by considering a time-dependent perturbation of the spin-orbit coupling. By deriving the exact transition matrix elements, we construct an effective Hamiltonian for the ASQ and investigate how this mechanism can be utilized to coherently drive the qubit.
Keywords: Andreev spin qubits; Andreev bound states; Germanium; Hole gas; Semiconductor
