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Charge avalanches and depinning in the Coulomb glass: The role of long-range interactions
KTH, School of Engineering Sciences (SCI), Theoretical Physics, Condensed Matter Theory. Theoretische Physik, ETH Zurich, Zurich, Switzerland.
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2016 (English)In: Physical Review B, ISSN 2469-9950, Vol. 93, no 9, 094429Article in journal (Refereed) Published
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Abstract [en]

We explore the stability of far-from-equilibrium metastable states of a three-dimensional Coulomb glass at zero temperature by studying charge avalanches triggered by a slowly varying external electric field. Surprisingly, we identify a sharply defined dynamical ("depinning") phase transition from stationary to nonstationary charge displacement at a critical value of the external electric field. Using particle-conserving dynamics, scale-free system-spanning avalanches are observed only at the critical field. We show that the qualitative features of this depinning transition are completely different for an equivalent short-range model, highlighting the key importance of long-range interactions for nonequilibrium dynamics of Coulomb glasses.

Place, publisher, year, edition, pages
American Physical Society , 2016. Vol. 93, no 9, 094429
Keyword [en]
Self-Organized Criticality, Electron Glass, Hysteresis, Disorder, Systems, Conductivity, Relaxation, Dynamics, Noise, Model
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URN: urn:nbn:se:kth:diva-185354DOI: 10.1103/PhysRevB.93.094429ISI: 000372712000002Scopus ID: 2-s2.0-84961878130OAI: oai:DiVA.org:kth-185354DiVA: diva2:921523
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QC 20160420

Available from: 2016-04-20 Created: 2016-04-18 Last updated: 2016-04-20Bibliographically approved

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