Laserlike Vibrational Instability in Rectifying Molecular Conductors

Jing Tao Lu; Per Hedegård; Mads Brandbyge

doi:10.1103/PhysRevLett.107.046801

Laserlike Vibrational Instability in Rectifying Molecular Conductors

Authors:

Lu, Jing Tao ;
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Department of Micro- and Nanotechnology, Technical University of Denmark
Hedegård, Per ;
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University of Copenhagen
Brandbyge, Mads
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0000-0002-0126-9824
Department of Micro- and Nanotechnology, Technical University of Denmark

DOI:

10.1103/PhysRevLett.107.046801

Abstract:

We study the damping of molecular vibrations due to electron-hole pair excitations in donor-acceptor (D-A) type molecular rectifiers. At finite voltage additional nonequilibrium electron-hole pair excitations involving both electrodes become possible, and contribute to the stimulated emission and absorption of phonons. We point out a generic mechanism for D-A molecules, where the stimulated emission can dominate beyond a certain voltage due to the inverted position of the D and A quantum resonances. This leads to current-driven amplification (negative damping) of the phonons similar to laser action. We investigate the effect in realistic molecular rectifier structures using first-principles calculations.

Type:

Journal article

Language:

English

Published in:

Physical Review Letters, 2011, Vol 107, Issue 4

Main Research Area:

Science/technology

Publication Status:

Published

Review type:

Peer Review

Submission year:

2011

Scientific Level:

Scientific

ID:

231946817

Laserlike Vibrational Instability in Rectifying Molecular Conductors

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