Universal Nonequilibrium I-V Curve at an Interacting Impurity Quantum Critical Point

dc.contributor.author

Zhang, G

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Chung, C-H

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Ke, CT

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Lin, C-Y

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Mebrahtu, H

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Smirnov, AI

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Finkelstein, G

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Baranger, HU

dc.date.accessioned

2019-12-22T00:41:51Z

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2019-12-22T00:41:51Z

dc.date.issued

2016-09

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2019-12-22T00:41:48Z

dc.description.abstract

The nonlinear I-V curve at an interacting quantum critical point (QCP) is typically out of reach theoretically. Here, however, we provide an analytical calculation of the I-V curve at a QCP under nonequilibrium conditions and, furthermore, present experimental results to which the theory is compared. The system is a quantum dot coupled to resistive leads: a spinless resonant level interacting with an ohmic electromagnetic environment. A two channel Kondo like QCP occurs when the level is on resonance and symmetrically coupled to the leads. Though similar to a resonant level in a Luttinger liquid, a key difference enables us to obtain the current at finite temperature and bias: because there are modes that do not initially couple to the environment, an analysis in terms of weak backscattering of non-interacting fermions coupled to a modified environment is possible. Drawing on dynamical Coulomb blockade theory, we then obtain an analytical expression for the nonlinear I-V curve. The agreement between our theoretical and experimental results is remarkable.

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https://hdl.handle.net/10161/19623

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American Physical Society

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arXiv

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Condensed Matter - Mesoscale and Nanoscale Physics

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Condensed Matter - Strongly Correlated Electrons

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Universal Nonequilibrium I-V Curve at an Interacting Impurity Quantum Critical Point

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Journal article

duke.contributor.orcid

Finkelstein, G|0000-0002-0883-0741

duke.contributor.orcid

Baranger, HU|0000-0002-1458-2756

pubs.organisational-group

Trinity College of Arts & Sciences

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Duke

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Physics

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Duke Institute for Brain Sciences

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University Institutes and Centers

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Institutes and Provost's Academic Units

pubs.publication-status

Published online

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1609

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