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Valence bond phases in S = 1/2 Kane-Mele-Heisenberg model

Zare, M. H ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1088/0953-8984/26/45/456004
  3. Abstract:
  4. The phase diagram of the Kane-Mele-Heisenberg model in a classical limit [47] contains disordered regions in the coupling space, as the result of competition between different terms in the Hamiltonian, leading to frustration in finding a unique ground state. In this work we explore the nature of these phases in the quantum limit, for a S = 1/2. Employing exact diagonalization in Sz and nearest neighbour valence bond bases, and bond and plaquette valence bond mean field theories, we show that the disordered regions are divided into ordered quantum states in the form of plaquette valence bond crystals and staggered dimerized phases
  5. Keywords:
  6. Kane-Mele-Heisnberg model ; Plaquette valence bond soild ; Heisenberg models ; Staggered dimerized soild ; Valence bonds
  7. Source: Journal of Physics Condensed Matter ; Vol. 26, issue. 45 , 2014 ; ISSN: 09538984
  8. URL: http://iopscience.iop.org/0953-8984/26/45/456004