Sasers (sound amplification by stimulated emission of radiation) in the nonlinear operating regime with various emitters

Zavtrak, S. T.; Volkov, I. V.

doi:10.1134/1.1258720

Cited by 2 publications

(1 citation statement)

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“…Furthermore, acoustic phonons have a long lifetime, giving rise to a high-gain and low-loss device [61]. Although phonon lasers are often referred to as "sasers" [62], we dub our narrow-band-based device a "phaser", to highlight the quantum nature of the underlying mechanism.…”

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confidence: 99%

Generating Coherent Phonon Waves in Narrow-Band Materials: A Twisted Bilayer Graphene Phaser

et al. 2023

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Twisted bilayer graphene (TBG) exhibits extremely low Fermi velocities for electrons, with the speed of sound surpassing the Fermi velocity. This regime enables the use of TBG for amplifying vibrational waves of the lattice through stimulated emission, following the same principles of operation of free-electron lasers. Our work proposes a lasing mechanism relying on the slow-electron bands to produce a coherent beam of acoustic phonons. We propose a device based on undulated electrons in TBG, which we dub the phaser. The device generates phonon beams in a terahertz (THz) frequency range, which can then be used to produce THz electromagnetic radiation. The ability to generate coherent phonons in solids breaks new ground in controlling quantum memories, probing quantum states, realizing non-equilibrium phases of matter, and designing new types of THz optical devices.

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confidence: 99%