Role of antisymmetric orbitals and electron-electron interactions on the two-particle spin and valley blockade in graphene double quantum dots

IF 3.7 2区物理与天体物理 Q1 Physics and Astronomy

Physical Review B Pub Date : 2025-04-18 DOI:10.1103/physrevb.111.165416

S. Möller, L. Banszerus, K. Hecker, H. Dulisch, K. Watanabe, T. Taniguchi, C. Volk, C. Stampfer

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Abstract

We report on an experimental study of spin and valley blockade in two-electron bilayer graphene (BLG) double quantum dots (DQDs) and explore the limits set by asymmetric orbitals and electron-electron interactions. The results obtained from magnetotransport measurements on two-electron BLG DQDs, where the resonant tunneling transport involves both orbital symmetric and antisymmetric two-particle states, show a rich level spectrum. We observe a magnetic field tunable spin and valley blockade, which is limited by the orbital splitting, the strength of the electron-electron interaction and the difference in the valley g-factors between the symmetric and antisymmetric two-particle orbital states. Our conclusions are supported by simulations based on rate equations, which allow the identification of prominent interdot transitions associated with the transition from single- to two-particle states observed in the experiment.

Published by the American Physical Society

2025

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石墨烯双量子点中反对称轨道和电子-电子相互作用对两粒子自旋和谷封锁的作用

本文报道了双电子双层石墨烯（BLG）双量子点（DQDs）中自旋和谷阻滞的实验研究，并探讨了不对称轨道和电子-电子相互作用所设置的限制。双电子BLG DQDs的磁输运测量结果显示，共振隧道输运涉及轨道对称和反对称两粒子态，具有丰富的能级谱。我们观察到磁场可调的自旋和谷封锁，这是由轨道分裂、电子-电子相互作用的强度以及对称和反对称两粒子轨道态之间谷g因子的差异所限制的。我们的结论得到了基于速率方程的模拟的支持，该方程允许识别与实验中观察到的从单粒子态到双粒子态转变相关的突出点间转变。2025年由美国物理学会出版

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Physical Review B 物理-物理：凝聚态物理

CiteScore

6.70

自引率

32.40%

发文量

审稿时长

3.0 months

期刊介绍： Physical Review B (PRB) is the world’s largest dedicated physics journal, publishing approximately 100 new, high-quality papers each week. The most highly cited journal in condensed matter physics, PRB provides outstanding depth and breadth of coverage, combined with unrivaled context and background for ongoing research by scientists worldwide. PRB covers the full range of condensed matter, materials physics, and related subfields, including: -Structure and phase transitions -Ferroelectrics and multiferroics -Disordered systems and alloys -Magnetism -Superconductivity -Electronic structure, photonics, and metamaterials -Semiconductors and mesoscopic systems -Surfaces, nanoscience, and two-dimensional materials -Topological states of matter