Observation of Majorana quantum critical behaviour in a resonant level coupled to a dissipative environment

dc.contributor.author

Mebrahtu, HT

dc.contributor.author

Borzenets, IV

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Zheng, H

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Bomze, YV

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Smirnov, AI

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Florens, S

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Baranger, HU

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Finkelstein, G

dc.date.accessioned

2019-12-26T18:31:18Z

dc.date.available

2019-12-26T18:31:18Z

dc.date.issued

2013

dc.date.updated

2019-12-26T18:31:16Z

dc.description.abstract

A quantum phase transition is an abrupt change between two distinct ground states of a many-body system, driven by an external parameter. In the vicinity of the quantum critical point (QCP) where the transition occurs, a new phase may emerge that is determined by quantum fluctuations and is very different from either phase. In particular, a conducting system may exhibit non-Fermi-liquid behaviour. Although this scenario is well established theoretically, controllable experimental realizations are rare. Here, we experimentally investigate the nature of the QCP in a simple nanoscale system-a spin-polarized resonant level coupled to dissipative contacts. We fine-tune the system to the QCP, realized exactly on-resonance and when the coupling between the level and the two contacts is symmetric. Several anomalous transport scaling laws are demonstrated, including a striking non-Fermi-liquid scattering rate at the QCP, indicating fractionalization of the resonant level into two Majorana quasiparticles.

dc.identifier.issn

1745-2473

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1745-2481

dc.identifier.uri

https://hdl.handle.net/10161/19647

dc.language

en

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Springer Science and Business Media LLC

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Nature Physics

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10.1038/nphys2735

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Science & Technology

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Physical Sciences

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Physics, Multidisciplinary

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Physics

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PHASE-TRANSITION

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SUPERCONDUCTOR

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NANOWIRE

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SIGNATURE

dc.title

Observation of Majorana quantum critical behaviour in a resonant level coupled to a dissipative environment

dc.type

Journal article

duke.contributor.orcid

Finkelstein, G|0000-0002-0883-0741

pubs.begin-page

732

pubs.end-page

737

pubs.issue

11

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

pubs.volume

9

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