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Anomalous negative magnetoresistance in quantum dot Josephson junctions with Kondo correlations

Deng, Mingtang LU ; Yu, Chunlin LU ; Huang, Guangyao LU ; López, Rosa ; Caroff, Philippe LU ; Ghalamestani, Sepideh LU ; Platero, Gloria and Xu, Hongqi LU (2024) In Science China: Physics, Mechanics and Astronomy 67(8).
Abstract

The interplay between superconductivity and the Kondo effect has stimulated significant interest in condensed matter physics. They compete when their critical temperatures are close and can give rise to a quantum phase transition that can mimic Majorana zero modes. Here, we have fabricated and measured Al-InSb nanowire quantum dot-Al devices. In the Kondo regime, a supercurrent-induced zero-bias conductance peak emerges. This zero-bias peak shows an anomalous negative magnetoresistance (NMR) at weak magnetic fields. We attribute this anomalous NMR to quasiparticle trapping at vortices in the superconductor leads as a weak magnetic field is applied. The trapping effect lowers the quasiparticle-caused dissipation and thus enhances the... (More)

The interplay between superconductivity and the Kondo effect has stimulated significant interest in condensed matter physics. They compete when their critical temperatures are close and can give rise to a quantum phase transition that can mimic Majorana zero modes. Here, we have fabricated and measured Al-InSb nanowire quantum dot-Al devices. In the Kondo regime, a supercurrent-induced zero-bias conductance peak emerges. This zero-bias peak shows an anomalous negative magnetoresistance (NMR) at weak magnetic fields. We attribute this anomalous NMR to quasiparticle trapping at vortices in the superconductor leads as a weak magnetic field is applied. The trapping effect lowers the quasiparticle-caused dissipation and thus enhances the Josephson current. This work connects the vortex physics and the supercurrent tunneling in Kondo regimes and can help further understand the physics of Josephson quantum dot system.

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author
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organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
InSb nanowire, Kondo correlation, quantum dot, quasiparticle trapping
in
Science China: Physics, Mechanics and Astronomy
volume
67
issue
8
article number
280362
publisher
Science China Press
external identifiers
  • scopus:85199781121
ISSN
1674-7348
DOI
10.1007/s11433-024-2382-1
language
English
LU publication?
yes
id
327667af-64e7-4300-8b58-043b9c47f47e
date added to LUP
2024-09-09 15:30:32
date last changed
2024-09-09 15:31:06
@article{327667af-64e7-4300-8b58-043b9c47f47e,
  abstract     = {{<p>The interplay between superconductivity and the Kondo effect has stimulated significant interest in condensed matter physics. They compete when their critical temperatures are close and can give rise to a quantum phase transition that can mimic Majorana zero modes. Here, we have fabricated and measured Al-InSb nanowire quantum dot-Al devices. In the Kondo regime, a supercurrent-induced zero-bias conductance peak emerges. This zero-bias peak shows an anomalous negative magnetoresistance (NMR) at weak magnetic fields. We attribute this anomalous NMR to quasiparticle trapping at vortices in the superconductor leads as a weak magnetic field is applied. The trapping effect lowers the quasiparticle-caused dissipation and thus enhances the Josephson current. This work connects the vortex physics and the supercurrent tunneling in Kondo regimes and can help further understand the physics of Josephson quantum dot system.</p>}},
  author       = {{Deng, Mingtang and Yu, Chunlin and Huang, Guangyao and López, Rosa and Caroff, Philippe and Ghalamestani, Sepideh and Platero, Gloria and Xu, Hongqi}},
  issn         = {{1674-7348}},
  keywords     = {{InSb nanowire; Kondo correlation; quantum dot; quasiparticle trapping}},
  language     = {{eng}},
  number       = {{8}},
  publisher    = {{Science China Press}},
  series       = {{Science China: Physics, Mechanics and Astronomy}},
  title        = {{Anomalous negative magnetoresistance in quantum dot Josephson junctions with Kondo correlations}},
  url          = {{http://dx.doi.org/10.1007/s11433-024-2382-1}},
  doi          = {{10.1007/s11433-024-2382-1}},
  volume       = {{67}},
  year         = {{2024}},
}