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Frustrated Heisenberg antiferromagnets: Fluctuation-induced first order vs. deconfined quantum criticality

Krüger, F; Scheidl, S; (2006) Frustrated Heisenberg antiferromagnets: Fluctuation-induced first order vs. deconfined quantum criticality. Europhysics Letters , 74 (5) pp. 896-902. 10.1209/epl/i2006-10039-3. Green open access

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Abstract

Recently it was argued that quantum phase transitions can be radically different from classical phase transitions with, as a highlight, the "deconfined critical points" exhibiting fractionalization of quantum numbers due to Berry phase effects. Such transitions are supposed to occur in frustrated ("J1-J2") quantum magnets. We have developed a novel renormalization approach for such systems which is fully respecting the underlying lattice structure. According to our findings, another profound phenomenon is around the corner: a fluctuation-induced (order-out-of-disorder) first-order transition. This has to occur for large spin and we conjecture that it is responsible for the weakly first-order behavior recently observed in numerical simulations for frustrated S = 1/2 systems.

Type: Article
Title: Frustrated Heisenberg antiferromagnets: Fluctuation-induced first order vs. deconfined quantum criticality
Open access status: An open access version is available from UCL Discovery
DOI: 10.1209/epl/i2006-10039-3
Publisher version: http://dx.doi.org/10.1209/epl/i2006-10039-3
Language: English
Additional information: Copyright © EDP Sciences 2006.
UCL classification: 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
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: http://discovery.ucl.ac.uk/id/eprint/1450189
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