Transport in Gapped Quantum Antiferromagnets
نویسندگان
چکیده
منابع مشابه
Spin dynamics and transport in gapped one-dimensional Heisenberg antiferromagnets at nonzero temperatures
We present the theory of nonzero temperature (T ) spin dynamics and transport in one-dimensional Heisenberg antiferromagnets with an energy gap ∆. For T ∆, we develop a semiclassical picture of thermally excited particles. Multiple inelastic collisions between the particles are crucial, and are described by a two-particle S-matrix which has a super-universal form at low momenta. This is establi...
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Bond-dilution effects on spin-1/2 spin-gapped Heisenberg antiferromagnets of coupled alternating chains on a square lattice are investigated by means of the quantum Monte Carlo method. It is found that, in contrast with the site-diluted system having an infinitesimal critical concentration, the bond-diluted system has a finite critical concentration of diluted bonds, xc, above which the system ...
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Insulating antiferromagnets offer a rich playground to explore novel quantum phases of matter. Triangular lattice s=1/2 antiferromagnets are of especial interest due to their reduced dimensionality, low spin, and frustrating interactions which all conspire to disrupt magnetic order, as found experimentally in several instances. The resulting “quantum disordered” phases are expected to have nove...
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I review recent work, performed in collaboration primarily with N. Read and Jinwu Ye, on the properties of quantum antiferromagnets in two dimensions. The emphasis is on the properties of the antiferromagnet in states which do not have any long-range magnetic order. The universal spin dynamics in the quantum critical region of number of frustrated and random antiferromagnets is studied; implica...
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By extending our recently proposed magnon-density waves to low dimensions, we investigate, using a microscopic many-body approach, the longitudinal excitations of the quasi-one-dimensional (quasi-1d) and quasi-2d Heisenberg antiferromagnetic systems on a bipartite lattice with a general spin quantum number. We obtain the full energy spectrum of the longitudinal mode as a function of the couplin...
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ژورنال
عنوان ژورنال: Journal of the Physical Society of Japan
سال: 2005
ISSN: 0031-9015,1347-4073
DOI: 10.1143/jpsjs.74s.191