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Laserlike Vibrational Instability in Rectifying Molecular Conductors

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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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    Orcid logo0000-0002-0126-9824
    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

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