Dresden 2026 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 20: Poster I
HL 20.26: Poster
Dienstag, 10. März 2026, 18:00–20:00, P1
Transport simulations of bilayer graphene/WSe2 electron-hole double quantum dots with spin-orbit coupling — •Nikita Berg1,2, Hubert Dulisch1,2, Roxana Anghel1,2, Simone Sotgiu1,2, Christian Volk1,2, and Christoph Stampfer1,2 — 1JARA-FIT and 2nd Institute of Physics, RWTH Aachen University — 2Peter Grünberg Institute (PGI-9), Forschungszentrum Jülich
The electron-hole (e-h) symmetry in bilayer graphene (BLG) gives rise to robust spin-valley blockade in double quantum dots (DQDs) operated in the e-h regime. This enables the system to serve as a sensitive probe for blockade-breaking mechanisms. BLG/WSe2 heterostructures offer electrostatic tunability of proximity-induced spin-orbit coupling (SOC) through the layer selectivity of the electron and hole wave functions in BLG. In this system, one possible spin-blockade-breaking mechanism arises from Rashba-type SOC, which can mediate spin-flip tunneling between the dots.
We present a master-equation-based steady-state transport simulation framework that accounts for coherence effects in e-h BLG double quantum dots. Using this approach, we show that Rashba-mediated spin-flip tunneling produces a distinctive dependence of the e-h blockade lifting on the angle of the applied in-plane magnetic field. This predicted angular dependence provides a clear and experimentally testable signature of induced Rashba spin-orbit coupling in BLG/WSe2 heterostructures.
Keywords: bilayer graphene; spin-valley blockade; quantum dot; spin-orbit coupling