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New developments in the theoretical treatment of low dimensional strongly correlated systems

James, AJA; Konik, RM; Lecheminant, P; Robinson, NJ; Tsvelik, AM; (2018) New developments in the theoretical treatment of low dimensional strongly correlated systems. Reports on Progress in Physics , 81 (4) , Article 046002. 10.1088/1361-6633/aa91ea. Green open access

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We review two important non-perturbative approaches for extracting the physics of low- dimensional strongly correlated quantum systems. Firstly, we start by providing a comprehensive review of non-Abelian bosonization. This includes an introduction to the basic elements of confor- mal field theory as applied to systems with a current algebra, and we orient the reader by presenting a number of applications of non-Abelian bosonization to models with large symmetries. We then tie this technique into recent advances in the ability of cold atomic systems to realize complex symme- tries. Secondly, we discuss truncated spectrum methods for the numerical study of systems in one and two dimensions. For one-dimensional systems we provide the reader with considerable insight into the methodology by reviewing canonical applications of the technique to the Ising model (and its variants) and the sine-Gordon model. Following this we review recent work on the development of renormalization groups, both numerical and analytical, that alleviate the effects of truncating the spectrum. Using these technologies, we consider a number of applications to one-dimensional systems: properties of carbon nanotubes, quenches in the Lieb-Liniger model, 1+1D quantum chro- modynamics, as well as Landau-Ginzburg theories. In the final part we move our attention to consider truncated spectrum methods applied to two-dimensional systems. This involves combining truncated spectrum methods with matrix product state algorithms. We describe applications of this method to two-dimensional systems of free fermions and the quantum Ising model, including their non-equilibrium dynamics.

Type: Article
Title: New developments in the theoretical treatment of low dimensional strongly correlated systems
Location: England
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1361-6633/aa91ea
Publisher version: http://doi.org/10.1088/1361-6633/aa91ea
Language: English
Additional information: Copyright © 2017 IOP Publishing Ltd. This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Low dimensional correlated systems, non-Abelian bosonization, truncated conformal space approach, numerical renormal- ization group, matrix product states, integrab, strongly correlated systems, theoretical treatment
UCL classification: UCL
UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
URI: https://discovery.ucl.ac.uk/id/eprint/10026111
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