Competition of spinon Fermi surface and heavy Fermi liquid states from the periodic Anderson to the Hubbard model

Chen, Chuan; Sodemann, Inti; Lee, Patrick A.

doi:10.1103/PhysRevB.103.085128

Title: Competition of spinon Fermi surface and heavy Fermi liquid states from the periodic Anderson to the Hubbard model

Journal Article · Fri Feb 19 00:00:00 EST 2021 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.103.085128· OSTI ID:1766343

Chen, Chuan;

; Lee, Patrick A.

We study a model of correlated electrons coupled by tunneling to a layer of itinerant metallic electrons, which allows us to interpolate from a frustrated limit favorable to spin liquid states to a Kondo-lattice limit favorable to interlayer coherent heavy metallic states. We study the competition of the spinon Fermi-surface state and the interlayer coherent heavy Kondo metal that appears with increasing tunneling. Employing a slave rotor mean-field approach, we obtain a phase diagram and describe two regimes where the spin liquid state is destroyed by weak interlayer tunneling: (i) the Kondo limit in which the correlated electrons can be viewed as localized spin moments and (ii) near the Mott metal-insulator transition where the spinon Fermi surface transitions continuously into a Fermi liquid. We study the shape of local density of states (LDOS) spectra of the putative spin liquid layer in the heavy Fermi-liquid phase and describe the temperature dependence of its width arising from quasiparticle interactions and disorder effects throughout this phase diagram, in an effort to understand recent scanning tunneling microscopy experiments of the candidate spin liquid 1T-TaSe₂ residing on metallic 1H-TaSe₂. Comparison of the shape and temperature dependence of the theoretical and experimental LDOS suggests that this system is either close to the localized Kondo limit or in an intermediate coupling regime where the Kondo coupling and the Heisenberg exchange interaction are comparable.

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Research Organization:: Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-03ER46076

OSTI ID:: 1766343

Alternate ID(s):: OSTI ID: 1777853

Journal Information:: Physical Review B, Journal Name: Physical Review B Vol. 103 Journal Issue: 8; ISSN 2469-9950

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Competition of spinon Fermi surface and heavy Fermi liquid states from the periodic Anderson to the Hubbard model

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