利用外部外加磁场消除受限的暗激子量子位进动

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

Physical Review B Pub Date : 2025-04-21 DOI:10.1103/physrevb.111.l161302

Zu-En Su, Dan Cogan, Ido Schwartz, Ayal Beck, David Gershoni

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引用次数: 0

摘要

本文从实验和理论上研究了在Voigt组态外磁场作用下，InAs/GaAs半导体量子点中受限暗激子的行为。通过改变外场的大小和方向，可以精确地控制暗激子精细结构的分裂。此外，我们发现暗激子自旋态沿立方晶体方向近似极化[100]或等效方向。通过将我们的实验结果与交换和塞曼相互作用的模型进行比较，我们发现了消除暗激子两个本征态之间的精细结构分裂的条件，从而停止了它的量子位进动。2025年由美国物理学会出版

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Eliminating the confined dark-exciton qubit precession using an externally applied magnetic field

We investigate experimentally and theoretically the behavior of the confined dark exciton in an InAs/GaAs semiconductor quantum dot, under the application of an external magnetic field in a Voigt configuration. We show that by varying the magnitude and direction of the external field one can accurately control the dark-exciton fine-structure splitting. In addition, we show that the dark-exciton spin state is approximately polarized along the cubic crystallographic directions [100] or equivalents. By comparing our experimental results with a model for the exchange and Zeeman interactions, we find the conditions for nullifying the fine-structure splitting between the two eigenstates of the dark exciton, thereby stopping its qubit precession.

Published by the American Physical Society

2025

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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