Abstract
The ultrasonic attenuation of the excitonic state in pure Bi in high magnetic fields is studied theoretically. Use is made of the mean-field approximation to describe the excitonic state in pure Bi in the extreme quantum limit, where the motion of the electron and the hole is limited only in the direction parallel to the magnetic field. The attenuation constant of the longitudinal sound has a broad peak below the excitonic transition temperatureT c and then decreases rapidly as the temperature decreases, which agrees qualitatively with a recent observation by Sakaiet al.
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Nakanishi, K., Maki, K. Ultrasonic attenuation of the excitonic state in pure bismuth in high magnetic fields. J Low Temp Phys 14, 87–99 (1974). https://doi.org/10.1007/BF00654812
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DOI: https://doi.org/10.1007/BF00654812