フルヤ　シュンスケ   FURUYA Shunsuke   古谷　峻介    所属   埼玉医科大学  医学部 教養教育    職種   専任講師
論文種別	学術雑誌(原著)
言語種別	英語
査読の有無	査読あり
表題	Topological quantum phase transition in the Ising-like antiferromagnetic spin chain BaCo2V2O8
掲載誌名	正式名：NATURE PHYSICS ISSNコード：1745-2473/1745-2481
出版社	NATURE PUBLISHING GROUP
巻・号・頁	14(7),716-+頁
著者・共著者	Quentin Faure,Shintaro Takayoshi,Sylvain Petit,Virginie Simonet,Stephane Raymond,Louis-Pierre Regnault,Martin Boehm,Jonathan S. White,Martin Mansson,Christian Rueegg,Pascal Lejay,Benjamin Canals,Thomas Lorenz,Shunsuke C. Furuya,Thierry Giamarchi,Beatrice Grenier
発行年月	2018/07
概要	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.
DOI	10.1038/s41567-018-0126-8