Lower Pseudogap Phase: A Spin/Vortex Liquid State

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dc.creatorWeng, Zheng-Yu
dc.creatorQi, Xiao-Liang
dc.date2006-03-05
dc.date.accessioned2026-07-07T07:59:24Z
dc.date.available2026-07-07T07:59:24Z
dc.descriptionThe pseudogap phase is considered as a new state of matter in the phase string model of the doped Mott insulator, which is composed of two distinct regimes known as upper and lower pseudogap phases, respectively. The former corresponds to the formation of spin singlet pairing and the latter is characterized by the formation of the Cooper pair amplitude and described by a generalized Gingzburg-Landau theory. Elementary excitation in this phase is a charge-neutral object carrying spin-1/2 and locking with a supercurrent vortex, known as spinon-vortex composite. Here thermally excited spinon-vortices destroy the phase coherence and are responsible for nontrivial Nernst effect and diamagnetism. The transport entropy and core energy associated with a spinon-vortex are determined by the spin degrees of freedom. Such a spontaneous vortex liquid phase can be also considered as a spin liquid with a finite correlation length and gapped S=1/2 excitations, where a resonancelike non-propagating spin mode emerges at the antiferromagnetic wavevector with a doping-dependent characteristic energy. A quantitative phase diagram in the parameter space of doping, temperature, and magnetic field is determined. Comparisons with experiments are also made.
dc.description22 pages, 12 figures
dc.identifierhttps://arxiv.org/abs/cond-mat/0603097
dc.identifierhttp://arxiv.org/abs/cond-mat/0603097
dc.identifierPhysical Review B 74, 144518 (2006)
dc.identifierdoi:10.1103/PhysRevB.74.144518
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/128356
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleLower Pseudogap Phase: A Spin/Vortex Liquid State
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