期刊
NANO LETTERS
卷 15, 期 10, 页码 7002-7005出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.5b03009
关键词
biexciton; binding energy; excited states; stochastic variational method; transition metal dichalcogenides; two-dimensional materials
类别
资金
- National Science Foundation (NSF) [PHY1314463, ECCS1307378, IIA126117]
- Direct For Mathematical & Physical Scien
- Division Of Physics [1314463] Funding Source: National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1307368] Funding Source: National Science Foundation
- Office Of The Director
- Office Of Internatl Science &Engineering [1261117] Funding Source: National Science Foundation
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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