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TT: Fachverband Tiefe Temperaturen
TT 49: Graphene and 2D Materials (joint session TT/HL)
TT 49.4: Vortrag
Donnerstag, 20. März 2025, 15:45–16:00, H33
Unifying Recent Experiments on Spin-Valley Locking in TMDC Quantum Dots — Aakash Shandilya1, Sundeep Kapila2, Radha Krishnan3, Bent Weber3, and •Bhaskaran Muralidharan2 — 1Department of Physics, IIT Bombay, Powai, Mumbai-400076, India — 2Department of Electrical Engineering, IIT Bombay, Powai, Mumbai-400076, India — 3Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 637371, Singapore
The spin-valley qubit promises significantly enhanced spin-valley lifetimes due to strong coupling of the electrons* spin to their momentum (valley) degrees of freedom. Very recently, few experiments on TMDC quantum dots have, for the first time, shared evidence for spin-valley locking at the few-electron limit. Employing quantum transport theory, we numerically simulate the ground- and excited-state transport spectroscopy signatures of these experiments under diverse conditions through a unified theoretical framework, and reveal the operating conditions, based on intrinsic properties, for spin- valley locking. We thus provide a method to experimentally deduce the degree of spin-valley locking based on the SOC strength, inter-valley mixing, and the spin and valley g-factors. Our theoretical analysis provides an important milestone towards the next challenge of experimentally confirming valley-relaxation times using single-shot projective measurements.
[1] A.Shandilya, S.Kapila, R.Krishna, B.Weber B.Muralidharan, ArXiv:2410.21814 (2024).
Keywords: Spin-valley qubits; 2D Material qubits