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Title: Hidden Fermi liquidity and topological criticality in the finite temperature Kitaev model
Authors: Pradhan S.
Laad M.S.
Ray A.
Maitra, Tulika
Taraphder A.
Published in: Solid State Communications
Abstract: The fate of exotic spin liquid states with fractionalized excitations at finite temperature (T) is of great interest, since signatures of fractionalization manifest in finite-temperature (T) dynamics in real systems, above the tiny magnetic ordering scales. Here, we study a Jordan–Wigner (JW) fermionized Kitaev spin liquid at finite T employing combined exact diagonalization and Monte Carlo simulation methods. We uncover (i) checkerboard or stripy-ordered flux crystals depending on density of flux, and (ii) establish, surprisingly, that: (a) the finite-T version of the T=0 transition from a gapless to gapped phases in the Kitaev model is a Mott transition of the fermions, belonging to the two-dimensional Ising universality class. These transitions correspond to a topological transition between a string condensate and a dilute closed string state (b) the Mott “insulator” phase is a precise realization of Laughlin's gossamer (here, p-wave) superconductor (g-SC), and (c) the Kitaev Toric Code phase (TC) is adiabatically connected to the g-SC, and is a fully Gutzwiller-projected fermi sea of JW fermions. These findings establish the finite-T quantum spin liquid phases in the d=2 to be hidden Fermi liquid(s) of neutral fermions. © 2021
Citation: Solid State Communications, 332
Issue Date: 2021
Publisher: Elsevier Ltd
Keywords: A. Quantum spin liquids
B. Strongly correlated systems
C. Superconductivity
D. Mott Insulator Transition
ISSN: 381098
Author Scopus IDs: 56402581300
Author Affiliations: Pradhan, S., Department of Physics, Ohio State University, ColumbusOH, 43210, United States, Department of Physics, Jhargram Raj College, India
Laad, M.S., Institute of Mathematical Sciences, Taramani, Chennai, 600113, India, Homi Bhabha National Institute, Mumbai, India
Ray, A., Department of Physics, Indian Institute of Technology RoorkeeUttarakhand, India
Maitra, T., Department of Physics, Indian Institute of Technology RoorkeeUttarakhand, India
Taraphder, A., Department of Physics, Indian Institute of Technology, Kharagpur, Kharagpur, 721302, India, Centre for Theoretical Studies, Indian Institute of Technology Kharagpur, Kharagpur, 721302, India, Department of Physics, Indian Institute of Technology Mandi, Kamand, MandiHimachal Pradesh 175005, India
Corresponding Author: Pradhan, S.; Department of Physics, United States; email:
Appears in Collections:Journal Publications [PH]

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