磁性范德华异质结构中激子里德伯态的超磁光克尔光谱
Magneto-optical Kerr spectroscopy of exciton Rydberg states in a magnetic van der Waals heterostructure
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中文总结 AI 辅助
通过波长分辨磁光克尔光谱研究MoSe2/Fe3GaTe2范德华异质结构，解析了A和B激子流形的磁对称性破缺，并归因于邻近诱导的交换耦合，确立了共振克尔光谱作为灵敏探针。
中文摘要 AI 辅助
二维半导体中的激子态对时间反演对称性破缺敏感，然而界面交换作用如何影响更高激子里德伯态仍 largely 未被探索。本文展示了波长分辨的超磁光克尔光谱，对邻近耦合的 MoSe$_2$/Fe$_3$GaTe$_2$ 范德华异质结构，解析了 A 和 B 激子流形中的磁性对称性破缺。结合反射、光致发光和光致发光激发光谱，以及包含金属 Fe$_3$GaTe$_2$ 层屏蔽效应的第一性原理多体计算，我们将显著增强的克尔共振归因于两个流形的基态和 2s 态。反转磁场会反转每个共振的极性。场奇/场偶分解证实了磁性起源。A 和 B 激子流形的相反克尔极性可以通过邻近诱导的交换耦合到两个激子系列相反价带自旋来解释。我们的结果确立了共振克尔光谱作为探测激子流形中磁致对称性破缺的灵敏探针。
英文摘要
Excitonic states in two-dimensional semiconductors are sensitive to time-reversal symmetry breaking, yet how interfacial exchange acts on higher-lying exciton Rydberg states remains largely unexplored. Here we show that wavelength-resolved magneto-optical Kerr spectroscopy of a proximity-coupled MoSe$_2$/Fe$_3$GaTe$_2$ van der Waals heterostructure resolves magnetic symmetry breaking across the A- and B-exciton manifolds. Combining reflection, photoluminescence, and photoluminescence excitation spectroscopy with first-principles many-body calculations including screening by the metallic Fe$_3$GaTe$_2$ layer, we assign the strongly enhanced Kerr resonances to the ground and 2s states of both manifolds. Reversing the magnetic field inverts the polarity of every resonance. A field-odd/field-even decomposition confirms a magnetic origin. The opposite Kerr polarities of the A- and B-exciton manifolds can be explained by proximity-induced exchange coupling to the opposite valence-band spins of the two exciton series. Our results establish resonant Kerr spectroscopy as a sensitive probe of magnetically induced symmetry breaking across the excitonic manifold.
发表机构
- National Institute for Materials Science（物质材料研究机构）
- Indian Institute of Science（印度科学学院）
- University of Southern California（南加州大学）
- Indian Institute of Technology (B.H.U.)（印度理工学院（贝拿勒斯印度教大学））
- Chalmers University of Technology（查尔姆斯理工大学）
机构由 AI 辅助整理，请以论文原文为准。
