Universität zu Köln

Bruognolo, Benedikt, Weichselbaum, Andreas ORCID: 0000-0002-5832-3908, von Delft, Jan ORCID: 0000-0002-8655-0999 and Garst, Markus ORCID: 0000-0001-5390-3316 (2016). Dynamic structure factor of the spin-1/2 XXZ chain in a transverse field. Phys. Rev. B, 94 (8). COLLEGE PK: AMER PHYSICAL SOC. ISSN 2469-9969

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Abstract

The spin-1/2 XXZ chain with easy-plane anisotropy in a transverse field describes well the thermodynamic properties of the material Cs2CoCl4 in a wide range of temperatures and fields including the region close to the spin-flop Ising quantum phase transition. For a comparison with prospective inelastic neutron scattering experiments on this compound, we present results of an extensive numerical study of its dynamic structure factor S-alpha beta (k, omega) using matrix-product-state (MPS) techniques. Close to criticality, the dynamic part of the correlator S-xx longitudinal to the applied field is incoherent and possesses a small total weight as the ground state is already close to saturation. The transverse correlator S-zz, on the other hand, is dominated by a coherent single-particle excitation with additional spectral weight at higher energies that we tentatively attribute to a repulsively bound pair of particles. With increasing temperature, the latter quickly fades and spectral weight instead accumulates close to zero wave vector just above the single-particle energy. On a technical level, we compare the numerical efficiency of real-time evolution to an MPS-based Chebyshev expansion in the present context, finding that both methods yield results of similar quality at comparable numerical costs.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bruognolo, Benedikt UNSPECIFIED UNSPECIFIED UNSPECIFIED Weichselbaum, Andreas UNSPECIFIED orcid.org/0000-0002-5832-3908 UNSPECIFIED von Delft, Jan UNSPECIFIED orcid.org/0000-0002-8655-0999 UNSPECIFIED Garst, Markus UNSPECIFIED orcid.org/0000-0001-5390-3316 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-266393
DOI:	10.1103/PhysRevB.94.085136
Journal or Publication Title:	Phys. Rev. B
Volume:	94
Number:	8
Date:	2016
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 MATRIX RENORMALIZATION-GROUP; MODEL Multiple languages Materials Science, Multidisciplinary; Physics, Applied; Physics, Condensed Matter Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/26639