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Title: Kondo physics from quasiparticle poisoning in Majorana devices

Journal Article · · Physical Review B
 [1];  [2];  [1];  [3];  [1]
  1. Heinrich-Heine-Univ., Dusseldorg (Germany)
  2. Brookhaven National Lab. (BNL), Upton, NY (United States)
  3. Heinrich-Heine-Univ., Dusseldorg (Germany); Univ. Grenoble Alpes, Grenoble (France); CEA, INAC-SPSMS, Grenoble (France)

Here, we present a theoretical analysis of quasiparticle poisoning in Coulomb-blockaded Majorana fermion systems tunnel-coupled to normal-conducting leads. Taking into account finite-energy quasiparticles, we derive the effective low-energy theory and present a renormalization group analysis. We find qualitatively new effects when a quasiparticle state with very low energy is localized near a tunnel contact. For M = 2 attached leads, such “dangerous” quasiparticle poisoning processes cause a spin S = 1/2 single-channel Kondo effect, which can be detected through a characteristic zero-bias anomaly conductance peak in all Coulomb blockade valleys. For more than two attached leads, the topological Kondo effect of the unpoisoned system becomes unstable. A strong-coupling bosonization analysis indicates that at low energy the poisoned lead is effectively decoupled and hence, for M > 3, the topological Kondo fixed point re-emerges, though now it involves only M–1 leads. As a consequence, for M = 3, the low-energy fixed point becomes trivial corresponding to decoupled leads.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SC00112704
OSTI ID:
1255721
Report Number(s):
BNL-112202-2016-JA; PRBMDO; R&D Project: PO015; KC0202030
Journal Information:
Physical Review B, Vol. 93, Issue 10; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (9)

Holographic optical traps for atom-based topological Kondo devices journal July 2016
Two-channel Kondo physics in a Majorana island coupled to a Josephson junction journal January 2017
Quantum transport in coupled Majorana box systems journal May 2018
Spin liquids from Majorana zero modes in a Cooper-pair box journal February 2019
Interplay between pairing and correlations in spin-polarized bound states journal January 2018
Roadmap to Majorana surface codes text January 2016
Many-terminal Majorana island: from Topological to Multi-Channel Kondo Model text January 2016
Sensing Floquet-Majorana fermions via heat transfer text January 2017
Spin liquids from Majorana Zero Modes in a Cooper Box text January 2018

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