Current-induced atomic dynamics, instabilities, and Raman signals: Quasiclassical Langevin equation approach

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Current-induced atomic dynamics, instabilities, and Raman signals : Quasiclassical Langevin equation approach. / Lu, Jing Tao; Brandbyge, Mads; Hedegard, Per; Todorov, Tchavdar N.; Dundas, Daniel.

In: Physical Review B (Condensed Matter and Materials Physics), Vol. 85, No. 24, 2012, p. Paper 245444.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

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Author

Lu, Jing Tao; Brandbyge, Mads; Hedegard, Per; Todorov, Tchavdar N.; Dundas, Daniel / Current-induced atomic dynamics, instabilities, and Raman signals : Quasiclassical Langevin equation approach.

In: Physical Review B (Condensed Matter and Materials Physics), Vol. 85, No. 24, 2012, p. Paper 245444.

Publication: Research - peer-reviewJournal article – Annual report year: 2012

Bibtex

@article{14ac9092d4a14f48a24b466945dd0a5e,
title = "Current-induced atomic dynamics, instabilities, and Raman signals: Quasiclassical Langevin equation approach",
keywords = "Physics, Electron-Tunneling Spectroscopy, Molecular-Transport Junctions, Current-Induced Forces, Gold Atoms, Conductance, Contacts, Microscopy, Scattering, Energy, Motion",
publisher = "American Physical Society",
author = "Lu, {Jing Tao} and Mads Brandbyge and Per Hedegard and Todorov, {Tchavdar N.} and Daniel Dundas",
note = "©2012 American Physical Society",
year = "2012",
doi = "10.1103/PhysRevB.85.245444",
volume = "85",
number = "24",
pages = "Paper 245444",
journal = "Physical Review B (Condensed Matter and Materials Physics)",
issn = "1098-0121",

}

RIS

TY - JOUR

T1 - Current-induced atomic dynamics, instabilities, and Raman signals

T2 - Quasiclassical Langevin equation approach

A1 - Lu,Jing Tao

A1 - Brandbyge,Mads

A1 - Hedegard,Per

A1 - Todorov,Tchavdar N.

A1 - Dundas,Daniel

AU - Lu,Jing Tao

AU - Brandbyge,Mads

AU - Hedegard,Per

AU - Todorov,Tchavdar N.

AU - Dundas,Daniel

PB - American Physical Society

PY - 2012

Y1 - 2012

N2 - We derive and employ a semiclassical Langevin equation obtained from path integrals to describe the ionic dynamics of a molecular junction in the presence of electrical current. The electronic environment serves as an effective nonequilibrium bath. The bath results in random forces describing Joule heating, current-induced forces including the nonconservative wind force, dissipative frictional forces, and an effective Lorentz-type force due to the Berry phase of the nonequilibrium electrons. Using a generic two-level molecular model, we highlight the importance of both current-induced forces and Joule heating for the stability of the system. We compare the impact of the different forces, and the wide-band approximation for the electronic structure on our result. We examine the current-induced instabilities (excitation of runaway "waterwheel" modes) and investigate the signature of these in the Raman signals.

AB - We derive and employ a semiclassical Langevin equation obtained from path integrals to describe the ionic dynamics of a molecular junction in the presence of electrical current. The electronic environment serves as an effective nonequilibrium bath. The bath results in random forces describing Joule heating, current-induced forces including the nonconservative wind force, dissipative frictional forces, and an effective Lorentz-type force due to the Berry phase of the nonequilibrium electrons. Using a generic two-level molecular model, we highlight the importance of both current-induced forces and Joule heating for the stability of the system. We compare the impact of the different forces, and the wide-band approximation for the electronic structure on our result. We examine the current-induced instabilities (excitation of runaway "waterwheel" modes) and investigate the signature of these in the Raman signals.

KW - Physics

KW - Electron-Tunneling Spectroscopy

KW - Molecular-Transport Junctions

KW - Current-Induced Forces

KW - Gold Atoms

KW - Conductance

KW - Contacts

KW - Microscopy

KW - Scattering

KW - Energy

KW - Motion

UR - http://prb.aps.org/abstract/PRB/v85/i24/e245444

U2 - 10.1103/PhysRevB.85.245444

DO - 10.1103/PhysRevB.85.245444

JO - Physical Review B (Condensed Matter and Materials Physics)

JF - Physical Review B (Condensed Matter and Materials Physics)

SN - 1098-0121

IS - 24

VL - 85

SP - Paper 245444

ER -