AVS 63rd International Symposium & Exhibition
    2D Materials Focus Topic Tuesday Sessions
       Session 2D-TuA

Paper 2D-TuA4
Excited Biexcitons in Two-Dimensional Transition Metal Dichalcogenides

Tuesday, November 8, 2016, 3:20 pm, Room 103B

Session: Novel Quantum Phenomena in 2D Materials
Presenter: Daniel Kidd, Vanderbilt University
Authors: D.W. Kidd, Vanderbilt University
D. Zhang, Vanderbilt University
K. Varga, Vanderbilt University
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Recently, experimental measurements and theoretical modeling have been in a disagreement concerning the binding energy of biexctions in transition metal dichalcogenides. While theory predicts a smaller binding energy (∼20 meV) that is lower than that of the trion, experiments find values much larger (∼60 meV), actually exceeding those for the trion. In this work, we show that there exists an excited state of the biexciton which yields binding energies that match well with experimental findings and thus gives a plausible explanation for the apparent discrepancy. Ground and excited states of the five-body exciton-trion are also investigated and shown to be bound.