Kondo physics from quasiparticle poisoning in Majorana devices
Abstract
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.
- Authors:
-
- Heinrich-Heine-Univ., Dusseldorg (Germany)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Heinrich-Heine-Univ., Dusseldorg (Germany); Univ. Grenoble Alpes, Grenoble (France); CEA, INAC-SPSMS, Grenoble (France)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1255721
- Report Number(s):
- BNL-112202-2016-JA
Journal ID: ISSN 2469-9950; PRBMDO; R&D Project: PO015; KC0202030
- Grant/Contract Number:
- SC00112704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 93; Journal Issue: 10; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Plugge, S., Tsvelik, A. M., Zazunov, A., Eriksson, E., and Egger, R. Kondo physics from quasiparticle poisoning in Majorana devices. United States: N. p., 2016.
Web. doi:10.1103/PhysRevB.93.104524.
Plugge, S., Tsvelik, A. M., Zazunov, A., Eriksson, E., & Egger, R. Kondo physics from quasiparticle poisoning in Majorana devices. United States. https://doi.org/10.1103/PhysRevB.93.104524
Plugge, S., Tsvelik, A. M., Zazunov, A., Eriksson, E., and Egger, R. Thu .
"Kondo physics from quasiparticle poisoning in Majorana devices". United States. https://doi.org/10.1103/PhysRevB.93.104524. https://www.osti.gov/servlets/purl/1255721.
@article{osti_1255721,
title = {Kondo physics from quasiparticle poisoning in Majorana devices},
author = {Plugge, S. and Tsvelik, A. M. and Zazunov, A. and Eriksson, E. and Egger, R.},
abstractNote = {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.},
doi = {10.1103/PhysRevB.93.104524},
journal = {Physical Review B},
number = 10,
volume = 93,
place = {United States},
year = {Thu Mar 24 00:00:00 EDT 2016},
month = {Thu Mar 24 00:00:00 EDT 2016}
}
Web of Science
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