title: PT-symmetric phonon laser.
abstract: By exploiting recent developments associated with coupled microcavities, we introduce the concept of the PT-symmetric phonon laser with balanced gain and loss. This is accomplished by introducing gain to one of the microcavities such that it balances the passive loss of the other. In the vicinity of the gain-loss balance, a strong nonlinear relation emerges between the intracavity-photon intensity and the input power. This then leads to a giant enhancement of both optical pressure and mechanical gain, resulting in a highly efficient phonon-lasing action. These results provide a promising approach for manipulating optomechanical systems through PT-symmetric concepts. Potential applications range from enhancing mechanical cooling to designing phonon-laser amplifiers.
authors.affiliation: CEMS, RIKEN, Saitama, 351-0198, Japan and Department of Physics, Henan Normal University, Xinxiang 453007, People's Republic of China.
authors.forename: Hui
authors.initials: H
authors.lastname: Jing
authors.affiliation: CEMS, RIKEN, Saitama, 351-0198, Japan and Electrical and Systems Engineering, Washington University, Saint Louis, Missouri 63130, USA.
authors.forename: S K
authors.initials: SK
authors.lastname: Özdemir
authors.affiliation: CEMS, RIKEN, Saitama, 351-0198, Japan.
authors.forename: Xin-You
authors.initials: XY
authors.lastname: Lü
authors.affiliation: CEMS, RIKEN, Saitama, 351-0198, Japan and Department of Automation, Tsinghua University, Beijing 100084, People's Republic of China.
authors.forename: Jing
authors.initials: J
authors.lastname: Zhang
authors.affiliation: Electrical and Systems Engineering, Washington University, Saint Louis, Missouri 63130, USA.
authors.forename: Lan
authors.initials: L
authors.lastname: Yang
authors.affiliation: CEMS, RIKEN, Saitama, 351-0198, Japan and Physics Department, University of Michigan, Ann Arbor, Michigan 48109-1040, USA.
authors.forename: Franco
authors.initials: F
authors.lastname: Nori