双分子层2H−MoSe2中的四极和偶极激子

IF 8.1 1区物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY

Physical review letters Pub Date : 2025-04-25 DOI:10.1103/physrevlett.134.166901

Shun Feng, Aidan J. Campbell, Bibi Mary Francis, Hyeonjun Baek, Takashi Taniguchi, Kenji Watanabe, Iann C. Gerber, Brian D. Gerardot, Mauro Brotons-Gisbert

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引用次数: 0

摘要

本文报道了在2h层MoSe2的反射率对比光谱中四极激子态的实验观察。垂直电场的应用导致这些四极激子的二次能量红移，而不是在双层MoSe2中共存的偶极激子中观察到的线性能量分裂。我们进行了螺旋分辨反射率对比测量，以研究四极激子态的自旋和谷构型作为施加垂直电场和磁场的函数。将我们的结果与现象学耦合振荡模型进行比较，表明四极激子态的电场和磁场依赖性可归因于具有相反永久偶极矩的自旋三重态层间激子的谷内和谷间杂化，并由层间空穴隧穿调节。这些结果将自然堆叠的MoSe2双层层定位为探索电场可调谐多体激子现象的有希望的平台。2025年由美国物理学会出版

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Quadrupolar and Dipolar Excitons in Bilayer 2H−MoSe2

We report the experimental observation of quadrupolar exciton states in the reflectance contrast spectrum of 2H-stacked bilayer MoSe2. The application of a vertical electric field results in a quadratic energy redshift of these quadrupolar excitons, in contrast to the linear energy splitting observed in the coexisting dipolar excitons within the bilayer MoSe2. We perform helicity-resolved reflectance contrast measurements to investigate the spin and valley configurations of the quadrupolar exciton states as a function of applied vertical electric and magnetic fields. Comparing our results with a phenomenological coupled-oscillator model indicates that the electric- and magnetic-field dependence of the quadrupolar exciton states can be attributed to the intra- and intervalley hybridization of spin-triplet interlayer excitons with opposite permanent dipole moments, mediated by interlayer hole tunneling. These results position naturally stacked MoSe2 bilayers as a promising platform to explore electric-field-tunable many-body exciton phenomena.

Published by the American Physical Society

2025

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来源期刊

Physical review letters 物理-物理：综合

CiteScore

16.50

自引率

7.00%

发文量

2673

审稿时长

2.2 months

期刊介绍： Physical review letters(PRL)covers the full range of applied, fundamental, and interdisciplinary physics research topics: General physics, including statistical and quantum mechanics and quantum information Gravitation, astrophysics, and cosmology Elementary particles and fields Nuclear physics Atomic, molecular, and optical physics Nonlinear dynamics, fluid dynamics, and classical optics Plasma and beam physics Condensed matter and materials physics Polymers, soft matter, biological, climate and interdisciplinary physics, including networks