Spin and valley waves in Dirac semimetals with population imbalance

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Volume Title

A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä

Date

2019-09-09

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en

Pages

4
1-4

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Physical Review B, Volume 100, issue 12

Abstract

We find an intervalley wave collective mode in two- and three-dimensional Dirac semimetals in the presence of a valley population imbalance. The dispersion relation of this mode is gapless, proportional to the square of the wave vector at small frequencies, and inversely proportional to the electron-electron exchange interaction energy. The valley wave serves as an energy gain source for the external field, that generates the intervalley transitions. The spin-wave analog is discussed for the case of a semimetal with nonequilibrium spin orientation.

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Zyuzin, A A & Zyuzin, A Y 2019, ' Spin and valley waves in Dirac semimetals with population imbalance ', Physical Review B, vol. 100, no. 12, 121402, pp. 1-4 . https://doi.org/10.1103/PhysRevB.100.121402