Gapless chiral spin liquid in a kagome Heisenberg model

Article

关键词: RESONATING-VALENCE-BOND;    QUANTUM HALL STATES;    LATTICE ANTIFERROMAGNET;    MOTT INSULATOR;    GROUND-STATE;    PHYSICS;    SUPERCONDUCTIVITY;    KAPELLASITE;    INSTABILITY;    MAGNETS;   

DOI  :  10.1103/PhysRevB.92.060407

来源: SCIE

【 摘 要 】

Motivated by recent experiments on the Heisenberg S = 1/2 quantum spin liquid candidate material kapellasite, we classify all possible chiral (time-reversal symmetry breaking) spin liquids with fermionic spinons on the kagome lattice. We obtain the phase diagram for the physically relevant extended Heisenberg model, comparing the energies of a wide range of microscopic variational wave functions. We propose that, at low temperature, kapellasite exhibits a gapless chiral spin liquid phase with spinon Fermi surfaces. This two-dimensional state inherits many properties of the nearby one-dimensional phase of decoupled antiferromagnetic spin chains, but also shows some remarkable differences. We discuss the spin structure factors and other physical properties.

【 授权许可】

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