Excited Biexcitons in Transition Metal Dichalcogenides

The Stochastic Variational Method (SVM) is used to show that the effective mass model correctly estimates the binding energies of excitons and trions but fails to predict the experimental binding energy of the biexciton. Using high-accuracy variational calculations, it is demonstrated that the biexc...

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Bibliographic Details
Published inNano letters Vol. 15; no. 10; pp. 7002 - 7005
Main Authors Zhang, David K, Kidd, Daniel W, Varga, Kálmán
Format Journal Article
LanguageEnglish
Published United States American Chemical Society 14.10.2015
Subjects
Binding energy
Chalcogens - chemistry
Excitation
Excitons
Mathematical models
Stochasticity
Transition Elements - chemistry
Transition metals
Trions
Variational methods
stochastic variational method
two-dimensional materials
transition metal dichalcogenides
excited states
binding energy
biexciton
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Summary:The Stochastic Variational Method (SVM) is used to show that the effective mass model correctly estimates the binding energies of excitons and trions but fails to predict the experimental binding energy of the biexciton. Using high-accuracy variational calculations, it is demonstrated that the biexciton binding energy in transition metal dichalcogenides is smaller than the trion binding energy, contradicting experimental findings. It is also shown that the biexciton has bound excited states and that the binding energy of the L = 0 excited state is in very good agreement with experimental data. This excited state corresponds to a hole attached to a negative trion and may be a possible resolution of the discrepancy between theory and experiment.
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ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.5b03009