Universität zu Köln

Cheng, Meng, Becker, Michael, Bauer, Bela ORCID: 0000-0001-9796-2115 and Lutchyn, Roman M. (2014). Interplay between Kondo and Majorana Interactions in Quantum Dots. Phys. Rev. X, 4 (3). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2160-3308

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Abstract

We study the properties of a quantum dot coupled to a topological superconductor and a normal lead and discuss the interplay between Kondo-and Majorana-induced couplings in quantum dots. The latter appears due to the presence of Majorana zero-energy modes localized, for example, at the ends of the one-dimensional superconductor. We investigate the phase diagram of the system as a function of Kondo and Majorana interactions using a renormalization-group analysis, a slave-boson mean-field theory, and numerical simulations using the density-matrix renormalization-group method. We show that, in addition to the well-known Kondo fixed point, the system may flow to a new fixed point controlled by the Majorana-induced coupling, which is characterized by nontrivial correlations between a localized spin on the dot and the fermion parity of the topological superconductor and the normal lead. We compute several measurable quantities, such as differential tunneling conductance and impurity-spin susceptibility, which highlight some peculiar features characteristic to the Majorana fixed point.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Cheng, Meng UNSPECIFIED UNSPECIFIED UNSPECIFIED Becker, Michael UNSPECIFIED UNSPECIFIED UNSPECIFIED Bauer, Bela UNSPECIFIED orcid.org/0000-0001-9796-2115 UNSPECIFIED Lutchyn, Roman M. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-428575
DOI:	10.1103/PhysRevX.4.031051
Journal or Publication Title:	Phys. Rev. X
Volume:	4
Number:	3
Date:	2014
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2160-3308
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language MATRIX RENORMALIZATION-GROUP; NON-ABELIAN STATISTICS; FIELD-THEORY; SUPERCONDUCTOR; NANOWIRE; SIGNATURE; JOSEPHSON; FERMIONS; REVERSAL; STATES Multiple languages Physics, Multidisciplinary Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/42857