2013/11/30 by Long Liang, Ziqiang Wang, Yue Yu · 1 citation
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Electron #Hubbard model #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum spin liquid #Spin polarization #Superconductivity #cond-mat.str-el
paper · pdf · doi:10.1103/physrevb.90.075119
published as Phys. Rev. B 90, 075119 (2014) · 10 pages, 9 figures
openalex publication_date 2014/08/11 · arxiv created 2014/08/13 · arxiv updated 2015/06/17 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We report the finding of a series of distinct-symmetry spin-liquid (SL) states and a rich phase diagram in a half-filled honeycomb lattice Hubbard model with spin-dependent hopping amplitude t^\ensuremath'. We first study the magnetic instability of the system and find two antiferromagnetic orders beyond a critical Hubbard U which increases with the ratio t^\ensuremath'/t. For t^\ensuremath' approaching t, the semimetal transforms to a U(1) SL and then to the Kitaev Z2 SL as U increases. In a wide middle range of t^\ensuremath'/t, the latter is replaced by a U(1) SL to SU(2) SL transition. The physical properties of the stable SL phases are discussed.