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Title: Magnetic field-induced intermediate quantum spin liquid with a spinon Fermi surface

Abstract

The Kitaev model with an applied magnetic field in the H [ 111 ] direction shows two transitions: from a nonabelian gapped quantum spin liquid (QSL) to a gapless QSL at H c 1 0.2 K and a second transition at a higher field H c 2 0.35 K to a gapped partially polarized phase, where K is the strength of the Kitaev exchange interaction. We identify the intermediate phase to be a gapless U(1) QSL and determine the spin structure function S ( k ) and the Fermi surface ϵ F S ( k ) of the gapless spinons using the density matrix renormalization group (DMRG) method for large honeycomb clusters. Further calculations of static spin-spin correlations, magnetization, spin susceptibility, and finite temperature-specific heat and entropy corroborate the gapped and gapless nature of the different field-dependent phases. In the intermediate phase, the spin-spin correlations decay as a power law with distance, indicative of a gapless phase.

Authors:
;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1524092
Grant/Contract Number:  
FG02-07ER46423
Resource Type:
Published Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America Journal Volume: 116 Journal Issue: 25; Journal ID: ISSN 0027-8424
Publisher:
Proceedings of the National Academy of Sciences
Country of Publication:
United States
Language:
English

Citation Formats

Patel, Niravkumar D., and Trivedi, Nandini. Magnetic field-induced intermediate quantum spin liquid with a spinon Fermi surface. United States: N. p., 2019. Web. doi:10.1073/pnas.1821406116.
Patel, Niravkumar D., & Trivedi, Nandini. Magnetic field-induced intermediate quantum spin liquid with a spinon Fermi surface. United States. doi:10.1073/pnas.1821406116.
Patel, Niravkumar D., and Trivedi, Nandini. Fri . "Magnetic field-induced intermediate quantum spin liquid with a spinon Fermi surface". United States. doi:10.1073/pnas.1821406116.
@article{osti_1524092,
title = {Magnetic field-induced intermediate quantum spin liquid with a spinon Fermi surface},
author = {Patel, Niravkumar D. and Trivedi, Nandini},
abstractNote = {The Kitaev model with an applied magnetic field in the H ∥ [ 111 ] direction shows two transitions: from a nonabelian gapped quantum spin liquid (QSL) to a gapless QSL at H c 1 ≃ 0.2 K and a second transition at a higher field H c 2 ≃ 0.35 K to a gapped partially polarized phase, where K is the strength of the Kitaev exchange interaction. We identify the intermediate phase to be a gapless U(1) QSL and determine the spin structure function S ( k ) and the Fermi surface ϵ F S ( k ) of the gapless spinons using the density matrix renormalization group (DMRG) method for large honeycomb clusters. Further calculations of static spin-spin correlations, magnetization, spin susceptibility, and finite temperature-specific heat and entropy corroborate the gapped and gapless nature of the different field-dependent phases. In the intermediate phase, the spin-spin correlations decay as a power law with distance, indicative of a gapless phase.},
doi = {10.1073/pnas.1821406116},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 25,
volume = 116,
place = {United States},
year = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1073/pnas.1821406116

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Cited by: 5 works
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