Time-dependent quantum transport in a resonant tunnel junction coupled to a nanomechanical oscillator
File(s)
Accepted version
Author(s)
Tahir, M
MacKinnon, A
Type
Journal Article
Abstract
We present a theoretical study of time-dependent quantum transport in a resonant tunnel junction coupled to a nanomechanical oscillator within the nonequilibrium Green’s function technique. An arbitrary voltage is applied to the tunnel junction and electrons in the leads are considered to be at zero temperature. The transient and the steady-state behavior of the system are considered here in order to explore the quantum dynamics of the oscillator as a function of time. The properties of the phonon distribution of the nanomechanical oscillator strongly coupled to the electrons on the dot are investigated using a nonperturbative approach. We consider both the energy transferred from the electrons to the oscillator and the Fano factor as a function of time. We discuss the quantum dynamics of the nanomechanical oscillator in terms of pure and mixed states. We have found a significant difference between a quantum and a classical oscillator. In particular, the energy of a classical oscillator will always be dissipated by the electrons whereas the quantum oscillator remains in an excited state. This will provide useful insight for the design of experiments aimed at studying the quantum behavior of an oscillator.
Date Issued
2010-05-28
Date Acceptance
2010-01-03
Citation
PHYSICAL REVIEW B, 2010, 81 (19)
ISSN
1098-0121
Publisher
American Physical Society
Journal / Book Title
PHYSICAL REVIEW B
Volume
81
Issue
19
Copyright Statement
© 2010 American Physical Society. Phys. Rev. B 81, 195444, https://dx.doi.org/10.1103/PhysRevB.81.195444
Identifier
http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000278142000133&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
Subjects
Science & Technology
Physical Sciences
Physics, Condensed Matter
Physics
SHOT-NOISE
CARBON NANOTUBES
NANOELECTROMECHANICAL SYSTEMS
MOLECULAR JUNCTIONS
SPECTROSCOPY
NANOTWEEZERS
CONDUCTANCE
TRANSISTOR
MOTION
WIRES
Publication Status
Published
Article Number
ARTN 195444
Date Publish Online
2010-05-28