Generating coherent phonon waves in narrow-band materials: a twisted bilayer graphene phaser

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SUMMARY

    Controlling and manipulating phonons is a long-sought goal offering a multitude of applications in electronics, information processing, and material science, known as phononics. Developing reliable sources of phonons is therefore of key importance for future advances in the field of phononics. Generation of coherent phonons in solids can be achieved through pumping by intense laser and magnetic_fields, or by the acoustic Cherenkov effect. At the same time, the spectrum of the acoustic phonons of the TBG near the magic angle is almost unaffected by the twist angle, giving rise to the "slow-electron . . .

     

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