Exact quantum spin liquids with Fermi surfaces in spin-half models

2009/08/12 by G. Baskaran, Baskaran, G., G. Santhosh +3 · 1 citation
Mathematics · Physics and Astronomy · #Advanced Condensed Matter Physics #Algebraic structures and combinatorial models #FOS: Physical sciences #Quantum many-body systems #Strongly Correlated Electrons (cond-mat.str-el)

paper · pdf · doi:10.48550/arxiv.0908.1614

openalex publication_date 2009/08/12 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28

Abstract

An emergent Fermi surface in a Mott insulator, an exotic quantum spin liquid state, was suggested by Anderson in 1987. After a quick support for its existence in spin-half Heisenberg model in a square lattice in a RVB mean field theory, pseudo Fermi surface was found only recently in an exactly solvable spin-3/2 model by Yao, Zhang and Kivelson. We show that a minimal spin-half Kitaev model on a decorated square lattice exhibits a Fermi surface. Volume and shape of the Fermi surface change with exchange couplings or on addition of a 3 spin interaction terms.

Cited by

• Exactly solvable spin liquids in Kitaev bilayers and moiré superlattices

Related

• Efficient matrix-product-state preparation of highly entangled trial states: Weak Mott insulators on the triangular lattice revisited
• A quantum spin liquid phase in the Kitaev-Hubbard model
• Spin-charge bound states and emerging fermions in a quantum spin liquid
• "Luttinger" and insulating spin liquids in two dimensions
• Field induced quantum spin liquid with spinon Fermi surfaces in the Kitaev model