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Universality of Plasmon Excitations in Dirac Semimetals.

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journal contribution
posted on 04.05.2016, 00:00 authored by DE Kharzeev, RD Pisarski, HU Yee
We investigate the properties of the collective plasmon excitations in Dirac semimetals by using the methods of relativistic field theory. We find a strong and narrow plasmon excitation whose frequency is in the terahertz (THz) range which may be important for practical applications. The properties of the plasmon appear universal for all Dirac semimetals, due to the large degeneracy of the quasiparticles and the small Fermi velocity, v_{F}≪c. This universality is closely analogous to the phenomenon of "dimensional transmutation" that is responsible for the emergence of dimensionful scales in relativistic field theories such as quantum chromodynamics.

Funding

This work was supported in part by the U.S. Department of Energy under Contracts No. DE-FG- 88ER40388 and No. DE-AC02-98CH10886.

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Publisher Statement

This is a copy of an article published in the Physical Review Letters © 2015 American Physical Society Publications.

Publisher

American Physical Society

issn

0031-9007

Issue date

04/12/2015

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