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dc.contributor.authorWang, Lingen_US
dc.contributor.authorSandvik, Anders W.en_US
dc.date.accessioned2018-12-06T16:39:59Z
dc.date.available2018-12-06T16:39:59Z
dc.date.issued2017-02-27
dc.identifierhttp://arxiv.org/abs/1702.08197v2
dc.identifier.citationLing Wang, Anders W Sandvik. 2017. "Critical level crossings and gapless spin liquid in the square-lattice spin-1/2 J1-J2 Heisenberg antiferromagnet."
dc.identifier.urihttps://hdl.handle.net/2144/32891
dc.description.abstractWe use the DMRG method to calculate several energy eigenvalues of the frustrated S = 1 / 2 square-lattice J 1 - J 2 Heisenberg model on 2 L × L cylinders with L ≤ 10. We identify excited-level crossings versus the coupling ratio g = J 2 /J 1 and study their drifts with the system size L . The lowest singlet-triplet and singlet-quintuplet crossings converge rapidly (with corrections ∝ L − 2 ) to different g values, and we argue that these correspond to ground-state transitions between the N ́eel antiferromagnet and a gapless spin liquid, at g c 1 ≈ 0 . 46, and between the spin liquid and a valence-bond-solid at g c 2 ≈ 0 . 52. Previous studies of order parameters were not able to positively discriminate between an extended spin liquid phase and a critical point. We expect level-crossing analysis to be a generically powerful tool in DMRG studies of quantum phase transitions.en_US
dc.subjectCondensed matteren_US
dc.subjectScience & technologyen_US
dc.subjectPhysical sciencesen_US
dc.subjectPhysicsen_US
dc.subjectDensity-matrix renormalizationen_US
dc.subjectSuperconductivityen_US
dc.subjectGeneral physicsen_US
dc.titleCritical level crossings and gapless spin liquid in the square-lattice spin-1/2 J1-J2 Heisenberg antiferromagneten_US
dc.typeArticleen_US
dc.description.versionAccepted manuscripten_US
pubs.elements-sourcemanual-entryen_US
pubs.notes6 pages 4 figs, 1 page 2 figs in appendixen_US
pubs.notesEmbargo: Not knownen_US
pubs.organisational-groupBoston Universityen_US
pubs.organisational-groupBoston University, College of Arts & Sciencesen_US
pubs.organisational-groupBoston University, College of Arts & Sciences, Department of Physicsen_US
pubs.publication-statusPublisheden_US
dc.identifier.orcid0000-0002-5638-4619 (Sandvik, Anders W)


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