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- W3205094625 abstract "Hydrogenic excited states of a 2D exciton are degenerate. In the presence of a weak magnetic field, the $S$-states with a zero momentum of the center of mass get coupled to the $P$-states with finite momentum of the center of mass. This field-induced coupling leads to a strong modification of the dispersion branches of the exciton spectrum. Namely, the lower branch acquires a shape of a mexican hat with a minimum at a finite momentum. At certain magnetic field, exciton branches exhibit a linear crossing, similarly to the spectrum of a 2D electron in the presence of spin-orbit coupling. While spin is not involved, degenerate $S$ and $P$ states play the role of the spin projections. Lifting of degeneracy due to diamagnetic shifts and deviation of electron-hole attraction from purely Coulomb suppresses the linear crossing." @default.
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- W3205094625 date "2022-01-01" @default.
- W3205094625 modified "2023-09-25" @default.
- W3205094625 title "Long-living excited states of a 2D diamagnetic exciton" @default.
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- W3205094625 doi "https://doi.org/10.1016/j.ssc.2021.114543" @default.
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