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

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Date
2013-01-01
Authors
Mebrahtu, HT
Borzenets, IV
Zheng, H
Bomze, YV
Smirnov, AI
Florens, S
Baranger, HU
Finkelstein, G
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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. © 2013 Macmillan Publishers Limited.
Type
Journal article
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https://hdl.handle.net/10161/19621
Published Version (Please cite this version)
10.1038/nphys2735
Publication Info
Mebrahtu, HT; Borzenets, IV; Zheng, H; Bomze, YV; Smirnov, AI; Florens, S; ... Finkelstein, G (2013). Observation of majorana quantum critical behaviour in a resonant level coupled to a dissipative environment. Nature Physics, 9(11). pp. 732-737. 10.1038/nphys2735. Retrieved from https://hdl.handle.net/10161/19621.
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Scholars@Duke

Baranger

Harold U. Baranger

Professor of Physics
The broad focus of Prof. Baranger's group is quantum open systems at the nanoscale, particularly the generation of correlation between particles in such systems. Fundamental interest in nanophysics-- the physics of small, nanometer scale, bits of solid-- stems from the ability to control and probe systems on length scales larger than atoms but small enough that the averaging inherent in bulk properties has not yet occurred. Using this ability, entirely unanticipated phenomena ca
Finkelstein

Gleb Finkelstein

Professor of Physics
Gleb Finkelstein is an experimental physicist interested in inorganic and biologically inspired nanostructures: carbon nanotubes, graphene, and self-assembled DNA 'origami'. These objects reveal a variety of interesting electronic properties that may form a basis for future detectors and sensors, or serve as individual devices in quantum information processing.
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