title: Current rectification by spontaneous symmetry breaking in coupled nanomechanical shuttles.
abstract: We investigate the transport and the dynamical properties of tunnel-coupled double charge shuttles. The oscillation frequencies of two shuttles are mode locked to integer multiples of the applied voltage frequency omega. We show that left-right-symmetric double shuttles may generate direct net current due to bistable motions caused by parametric instability. The symmetry-broken direct current appears near omega = Omega0/(2j-1), (j = 1,2,...), where Omega0 is the dressed resonance frequency of the relative motion of the two shuttles.
authors.affiliation: Department of Physics, Chungnam National University, Daejeon 305-764, Republic of Korea.
authors.forename: Kang-Hun
authors.initials: KH
authors.lastname: Ahn
authors.forename: Hee Chul
authors.initials: HC
authors.lastname: Park
authors.forename: Jan
authors.initials: J
authors.lastname: Wiersig
authors.forename: Jongbae
authors.initials: J
authors.lastname: Hong