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Title

Proposal for a phonon laser utilizing quantum-dot spin states

AuthorsKhaetskii, A.; Golovach, V. N.; Hu, Xuan; Žutić, I.
Issue Date2013
PublisherAmerican Physical Society
CitationPhysical Review Letters 111: 186601 (2013)
AbstractWe propose a nanoscale realization of a phonon laser utilizing phonon-assisted spin flips in quantum dots to amplify sound. Owing to a long spin relaxation time, the device can be operated in a strong pumping regime, in which the population inversion is close to its maximal value allowed under Fermi statistics. In this regime, the threshold for stimulated emission is unaffected by spontaneous spin flips. Considering a nanowire with quantum dots defined along its length, we show that a further improvement arises from confining the phonons to one dimension, and thus reducing the number of phonon modes available for spontaneous emission. Our work calls for the development of nanowire-based, high-finesse phonon resonators. © 2013 American Physical Society.
URIhttp://hdl.handle.net/10261/102515
DOI10.1103/PhysRevLett.111.186601
Identifiersdoi: 10.1103/PhysRevLett.111.186601
issn: 0031-9007
e-issn: 1079-7114
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