期刊
PHYSICAL REVIEW LETTERS
卷 115, 期 16, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.166803
关键词
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资金
- DOE Basic Energy Sciences [DE-SC0012509]
- AFOSR [FA9550-14-1-0277]
- U.S. Department of Energy (DOE) [DE-SC0012509] Funding Source: U.S. Department of Energy (DOE)
By quantizing the semiclassical motion of excitons, we show that the Berry curvature can cause an energy splitting between exciton states with opposite angular momentum. This splitting is determined by the Berry curvature flux through the k-space area spanned by the relative motion of the electron-hole pair in the exciton wave function. Using the gapped two-dimensional Dirac equation as a model, we show that this splitting can be understood as an effective spin-orbit coupling effect. In addition, there is also an energy shift caused by other relativistic terms. Our result reveals the limitation of the venerable hydrogenic model of excitons, and it highlights the importance of the Berry curvature in the effective mass approximation.
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