Universität zu Köln

Faure, Quentin, Takayoshi, Shintaro, Petit, Sylvain, Simonet, Virginie, Raymond, Stephane, Regnault, Louis-Pierre, Boehm, Martin, White, Jonathan S., Mansson, Martin ORCID: 0000-0002-3086-9642, Rueegg, Christian, Lejay, Pascal, Canals, Benjamin, Lorenz, Thomas ORCID: 0000-0003-4832-5157, Furuya, Shunsuke C., Giamarchi, Thierry ORCID: 0000-0001-7409-5071 and Grenier, Beatrice (2018). Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo2V2O8. Nat. Phys., 14 (7). S. 716 - 724. LONDON: NATURE PUBLISHING GROUP. ISSN 1745-2481

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Abstract

Since the seminal ideas of Berezinskii, Kosterlitz and Thouless, topological excitations have been at the heart of our understanding of a whole novel class of phase transitions. In most cases, those transitions are controlled by a single type of topological objects. There are, however, some situations, still poorly understood, where two dual topological excitations fight to control the phase diagram and the transition. Finding experimental realizations of such cases is thus of considerable interest. We show here that this situation occurs in BaCo2V2O8, a spin-1/2 Ising-like quasi-one-dimensional antiferromagnet, when subjected to a uniform magnetic field transverse to the Ising axis. Using neutron scattering experiments, we measure a drastic modification of the quantum excitations beyond a critical value of the magnetic field. This quantum phase transition is identified, through a comparison with theoretical calculations, to be a transition between two different types of solitonic topological object, which are captured by different components of the dynamical structure factor.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Faure, Quentin UNSPECIFIED UNSPECIFIED UNSPECIFIED Takayoshi, Shintaro UNSPECIFIED UNSPECIFIED UNSPECIFIED Petit, Sylvain UNSPECIFIED UNSPECIFIED UNSPECIFIED Simonet, Virginie UNSPECIFIED UNSPECIFIED UNSPECIFIED Raymond, Stephane UNSPECIFIED UNSPECIFIED UNSPECIFIED Regnault, Louis-Pierre UNSPECIFIED UNSPECIFIED UNSPECIFIED Boehm, Martin UNSPECIFIED UNSPECIFIED UNSPECIFIED White, Jonathan S. UNSPECIFIED UNSPECIFIED UNSPECIFIED Mansson, Martin UNSPECIFIED orcid.org/0000-0002-3086-9642 UNSPECIFIED Rueegg, Christian UNSPECIFIED UNSPECIFIED UNSPECIFIED Lejay, Pascal UNSPECIFIED UNSPECIFIED UNSPECIFIED Canals, Benjamin UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, Thomas UNSPECIFIED orcid.org/0000-0003-4832-5157 UNSPECIFIED Furuya, Shunsuke C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Giamarchi, Thierry UNSPECIFIED orcid.org/0000-0001-7409-5071 UNSPECIFIED Grenier, Beatrice UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-180612
DOI:	10.1038/s41567-018-0126-8
Journal or Publication Title:	Nat. Phys.
Volume:	14
Number:	7
Page Range:	S. 716 - 724
Date:	2018
Publisher:	NATURE PUBLISHING GROUP
Place of Publication:	LONDON
ISSN:	1745-2481
Language:	English
Faculty:	Faculty of Mathematics and Natural Sciences
Divisions:	Faculty of Mathematics and Natural Sciences > Department of Physics > Institute of Physics II
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ORDER; MODEL Multiple languages Physics, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/18061