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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| Published in | Nano letters Vol. 15; no. 10; pp. 7002 - 7005 |
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| Main Authors | , , |
| Format | Journal Article |
| Language | English |
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United States
American Chemical Society
14.10.2015
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| Abstract | 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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| AbstractList | 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. Keywords: biexciton; binding energy; excited states; stochastic variational method; transition metal dichalcogenides; two-dimensional materials 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. |
| Author | Kidd, Daniel W Zhang, David K Varga, Kálmán |
| AuthorAffiliation | Vanderbilt University Department of Physics and Astronomy |
| AuthorAffiliation_xml | – name: Department of Physics and Astronomy – name: Vanderbilt University |
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| BackLink | https://www.ncbi.nlm.nih.gov/pubmed/26422057$$D View this record in MEDLINE/PubMed |
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| Keywords | stochastic variational method two-dimensional materials transition metal dichalcogenides excited states binding energy biexciton |
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| SubjectTerms | Binding energy Chalcogens - chemistry Excitation Excitons Mathematical models Stochasticity Transition Elements - chemistry Transition metals Trions Variational methods |
| Title | Excited Biexcitons in Transition Metal Dichalcogenides |
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