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Electron-Hole Liquid in Monolayer Transition Metal Dichalcogenide Heterostructures

  • Condensed Matter
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Abstract

Monolayer films of transition metal dichalcogenides (in particular, MoS2, MoSe2, WS2, and WSe2) can be considered as ideal systems for the studies of high-temperature electron-hole liquids. The quasi-two-dimensional nature of electrons and holes ensures their stronger interaction as compared to that in bulk semiconductors. The screening of the Coulomb interaction in monolayer heterostructures is significantly reduced, since it is determined by the permittivities of the environment (e.g., vacuum and substrate), which are much lower than those characteristic of the films of transition metal dichalcogenides. The multivalley structure of the energy spectrum of charge carriers in transition metal dichalcogenides significantly reduces the kinetic energy, resulting in the increase in the equilibrium density and binding energy of the electron-hole liquid. The binding energy of the electron-hole liquid and its equilibrium density are determined. It is shown that the two-dimensional Coulomb potential should be used in the calculations for the electron-hole liquid.

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Funding

P.V. Ratnikov acknowledges the support of the Foundation for the Advancement of Theoretical Physics and Mathematics BASIS (project no. 17-14-440-1, the general formulation of the problem) and of the Russian Science Foundation (project no. 16-12-10538-P, the calculations of the correlation energy, Section 3).

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Authors and Affiliations

  1. Lebedev Physical Institute, Russian Academy of Sciences, Moscow, 119991, Russia

    P. L. Pekh & A. P. Silin

  2. Prokhorov General Physics Institute, Russian Academy of Sciences, Moscow, 119991, Russia

    P. V. Ratnikov

  3. Moscow Institute of Physics and Technology (National Research University), Dolgoprudnyi, Moscow region, 141700, Russia

    A. P. Silin

Authors
  1. P. L. Pekh
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  2. P. V. Ratnikov
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  3. A. P. Silin
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Correspondence to P. L. Pekh.

Additional information

Russian Text © The Author(s), 2020, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2020, Vol. 111, No. 2, pp. 80-85.

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Pekh, P.L., Ratnikov, P.V. & Silin, A.P. Electron-Hole Liquid in Monolayer Transition Metal Dichalcogenide Heterostructures. Jetp Lett. 111, 90–95 (2020). https://doi.org/10.1134/S0021364020020101

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  • DOI: https://doi.org/10.1134/S0021364020020101

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