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Thermal-transport studies of kagomé antiferromagnets.
J Phys Condens Matter
February 2020
The Institute for Solid State Physics, University of Tokyo, Kashiwa, 277-8581, Japan.
Searching for the ground state of a kagomé Heisenberg antiferromagnet (KHA) has been one of the central issues of condensed-matter physics, because the KHA is expected to host spin-liquid phases with exotic elementary excitations. Here, we show our longitudinal ([Formula: see text]) and transverse ([Formula: see text]) thermal conductivities measurements of the two kagomé materials, volborthite and Ca kapellasite. Although magnetic orders appear at temperatures much lower than the antiferromagnetic energy scale in both materials, the nature of spin liquids can be captured above the transition temperatures.
View Article and Find Full Text PDFEdge magnetism of Heisenberg model on honeycomb lattice.
Sci Rep
March 2017
Department of Physics, National Tsing Hua University, Hsinchu 30013, Taiwan.
Edge magnetism in graphene sparks intense theoretical and experimental interests. In the previous study, we demonstrated the existence of collective excitations at the zigzag edge of the honeycomb lattice with long-ranged Néel order. By employing the Schwinger-boson approach, we show that the edge magnons remain robust even when the long-ranged order is destroyed by spin fluctuations.
View Article and Find Full Text PDFRealization of the Haldane-Kane-Mele Model in a System of Localized Spins.
Phys Rev Lett
November 2016
Department of Physics and Astronomy, University of California, Los Angeles, California 90095, USA.
We study a spin Hamiltonian for spin-orbit-coupled ferromagnets on the honeycomb lattice. At sufficiently low temperatures supporting the ordered phase, the effective Hamiltonian for magnons, the quanta of spin-wave excitations, is shown to be equivalent to the Haldane model for electrons, which indicates the nontrivial topology of the band and the existence of the associated edge state. At high temperatures comparable to the ferromagnetic-exchange strength, we take the Schwinger-boson representation of spins, in which the mean-field spinon band forms a bosonic counterpart of the Kane-Mele model.
View Article and Find Full Text PDFBroken discrete and continuous symmetries in two-dimensional spiral antiferromagnets.
J Phys Condens Matter
November 2013
Instituto de Física Rosario (CONICET) and Universidad Nacional de Rosario, Boulevard 27 de Febrero 210 bis, (2000) Rosario, Argentina.
We study the occurrence of symmetry breaking, at zero and finite temperatures, in the J1-J3 antiferromagnetic Heisenberg model on the square lattice using Schwinger boson mean field theory. For spin-1/2 the ground state always breaks the SU(2) symmetry with a continuous quasi-critical transition at J3/J1 ∼ 0.38, from Néel to spiral long range order, although local spin fluctuation considerations suggest an intermediate disordered regime around 0.
View Article and Find Full Text PDFVariational study of the quantum phase transition in the bilayer Heisenberg model with bosonic RVB wavefunction.
J Phys Condens Matter
November 2011
Department of Physics, Renmin University of China, Beijing 100872, People's Republic of China.
We study the ground state phase diagram of the bilayer Heisenberg model on a square lattice with a bosonic resonating valence bond (RVB) wavefunction. The wavefunction has the form of a Gutzwiller projected Schwinger boson mean-field ground state and involves two variational parameters. We find the wavefunction provides an accurate description of the system on both sides of the quantum phase transition.
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