Universität zu Köln

Alberton, Ori, Ruhman, Jonathan, Berg, Erez and Altman, Ehud (2017). Fate of the one-dimensional Ising quantum critical point coupled to a gapless boson. Phys. Rev. B, 95 (7). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The problem of a quantum Ising degree of freedom coupled to a gapless bosonic mode appears naturally in many one-dimensional systems, yet surprisingly little is known how such a coupling affects the Ising quantum critical point. We investigate the fate of the critical point in a regime, where the weak coupling renormalization group (RG) indicates a flow toward strong coupling. Using a renormalization group analysis and numerical density matrix renormalization group (DMRG) calculations we show that, depending on the ratio of velocities of the gapless bosonic mode and the Ising critical fluctuations, the transition may remain continuous or become fluctuation-driven first order. The two regimes are separated by a tricritical point of a novel type.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Alberton, Ori UNSPECIFIED UNSPECIFIED UNSPECIFIED Ruhman, Jonathan UNSPECIFIED UNSPECIFIED UNSPECIFIED Berg, Erez UNSPECIFIED UNSPECIFIED UNSPECIFIED Altman, Ehud UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-239643
DOI:	10.1103/PhysRevB.95.075132
Journal or Publication Title:	Phys. Rev. B
Volume:	95
Number:	7
Date:	2017
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/23964