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Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS2

Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS2... We perform a polarization-resolved magnetoluminescence study of excitons in ReS2. We observe that two linearly polarized Rydberg series of excitons are accompanied by two other Rydberg series of dark excitons, brightened by an in-plane magnetic field. All series extrapolate to the same single-electron bandgap, indicating that the observed excitons originate either from the same valley or from two valleys related by the inversion symmetry, and are split by exchange interaction. To interpret our observations of the magnetic brightening, we have to assume the dominant spin–orbit coupling to be Ising-like, which hints at an approximate symmetry of the electronic states in ReS2 which is higher than the crystal symmetry Ci. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png 2D Materials IOP Publishing

Exchange-split multiple Rydberg series of excitons in anisotropic quasi two-dimensional ReS2

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References (39)

Publisher
IOP Publishing
Copyright
© 2022 IOP Publishing Ltd
eISSN
2053-1583
DOI
10.1088/2053-1583/ac7880
Publisher site
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Abstract

We perform a polarization-resolved magnetoluminescence study of excitons in ReS2. We observe that two linearly polarized Rydberg series of excitons are accompanied by two other Rydberg series of dark excitons, brightened by an in-plane magnetic field. All series extrapolate to the same single-electron bandgap, indicating that the observed excitons originate either from the same valley or from two valleys related by the inversion symmetry, and are split by exchange interaction. To interpret our observations of the magnetic brightening, we have to assume the dominant spin–orbit coupling to be Ising-like, which hints at an approximate symmetry of the electronic states in ReS2 which is higher than the crystal symmetry Ci.

Journal

2D Materials – IOP Publishing

Published: Oct 1, 2022

Keywords: Rydberg series; anisotropic excitons; fine structure splitting; rhenium disulfide

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