Universität zu Köln

Amelin, Kirill ORCID: 0000-0003-4106-5006, Engelmayer, Johannes, Viirok, Johan, Nagel, Urmas ORCID: 0000-0001-5827-9495, Room, Toomas, Lorenz, Thomas ORCID: 0000-0003-4832-5157 and Wang, Zhe ORCID: 0000-0001-7464-5408 (2020). Experimental observation of quantum many-body excitations of E-8 symmetry in the Ising chain ferromagnet CoNb2O6. Phys. Rev. B, 102 (10). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

Close to the quantum critical point of the transverse-field Ising spin-chain model, an exotic dynamic spectrum was predicted to emerge upon a perturbative longitudinal field. The dynamic spectrum consists of eight particles and is governed by the symmetry of the E-8 Lie algebra. Here we report on high-resolution terahertz spectroscopy of quantum spin dynamics in the ferromagnetic Ising-chain material CoNb2O6. At 0.25 K in the magnetically ordered phase we identify characteristics of the first six E-8 particles, m(1) to m(6), and the two-particle (m(1) + m(2)) continuum in an applied transverse magnetic field of B-c(1D) = 4.75 T, before the three-dimensional magnetic order is suppressed above B-c(3T )approximate to( )5.3 T. The observation of the higher-energy particles (m(3) to m(6)) above the low-energy two-particle continua features quantum many-body effects in the exotic dynamic spectrum.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Amelin, Kirill UNSPECIFIED orcid.org/0000-0003-4106-5006 UNSPECIFIED Engelmayer, Johannes UNSPECIFIED UNSPECIFIED UNSPECIFIED Viirok, Johan UNSPECIFIED UNSPECIFIED UNSPECIFIED Nagel, Urmas UNSPECIFIED orcid.org/0000-0001-5827-9495 UNSPECIFIED Room, Toomas UNSPECIFIED UNSPECIFIED UNSPECIFIED Lorenz, Thomas UNSPECIFIED orcid.org/0000-0003-4832-5157 UNSPECIFIED Wang, Zhe UNSPECIFIED orcid.org/0000-0001-7464-5408 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-318392
DOI:	10.1103/PhysRevB.102.104431
Journal or Publication Title:	Phys. Rev. B
Volume:	102
Number:	10
Date:	2020
Publisher:	AMER PHYSICAL SOC
Place of Publication:	COLLEGE PK
ISSN:	2469-9969
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 MAGNETIC-FIELD; MODEL Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/31839