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Dissociation of Exciton States in Warm Dense Hydrogen

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The transition from the molecular state to the atomic state in warm dense hydrogen fluid has been actively studied in the past few decades. The use of various experimental techniques has not yet led to reliable results consistent with each other. Despite numerous attempts, theoretical methods have not yet explained existing discrepancies in the experimental data and the microscopic mechanism of the transition of hydrogen fluid to a conducting state. In [I.D. Fedorov, N.D. Orekhov, and V.V. Stegailov, Phys. Rev. B 101, 100101 (R) (2020)], the importance of taking into account nonequilibrium nonadiabatic processes in the analysis of the mechanisms of such transition was demonstrated. In this work, the characteristics of exciton states formed as a result of spontaneous vibronic excitations are calculated. It is shown that the dissociation of such excitons at high temperatures can explain the experimentally observed features of the transition under study.

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ACKNOWLEDGMENTS

We are grateful to Prof. G.E. Norman for his interest in this study and to Prof. N. Doltsinis for his advice concerning the usage of Wannier orbitals in the analysis of the electron structure. The study was performed using the resources of the Supercomputer Center, Joint Institute for High Temperatures, Russian Academy of Sciences.

Funding

The work was supported by the Ministry of Science and Higher Education of the Russian Federation (agreement no. 075-15-2020-785 dated on September 23, 2020 with the Joint Institute for High Temperatures, Russian Academy of Sciences).

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Authors and Affiliations

  1. Joint Institute for High Temperatures, Russian Academy of Sciences, 125412, Moscow, Russia

    I. D. Fedorov & V. V. Stegailov

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

    I. D. Fedorov & V. V. Stegailov

  3. National Research University Higher School of Economics, 101000, Moscow, Russia

    V. V. Stegailov

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  1. I. D. Fedorov
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Correspondence to V. V. Stegailov.

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Translated by K. Kugel

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Fedorov, I.D., Stegailov, V.V. Dissociation of Exciton States in Warm Dense Hydrogen. Jetp Lett. 113, 396–401 (2021). https://doi.org/10.1134/S0021364021060047

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