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Dynamics and Transport in Random Antiferromagnetic Spin Chains

Damle, Kedar and Motrunich, Olexei and Huse, David A. (2000) Dynamics and Transport in Random Antiferromagnetic Spin Chains. Physical Review Letters, 84 (15). pp. 3434-3437. ISSN 0031-9007. doi:10.1103/PhysRevLett.84.3434.

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We present the first results on the low-frequency dynamical and transport properties of random antiferromagnetic spin chains at low temperature (T). We obtain the momentum and frequency dependent dynamic structure factor in the random singlet (RS) phases of both spin-1/2 and spin-1 chains, as well as in the random dimer phase of spin-1/2 chains. We also show that the RS phases are unusual “spin-metals” with divergent low-frequency conductivity at T = 0, and follow the spin conductivity through “metal-insulator” transitions tuned by the strength of dimerization or Ising anisotropy in the spin-1/2 case and by the strength of disorder in the spin-1 case.

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Motrunich, Olexei0000-0001-8031-0022
Additional Information:© 2000 The American Physical Society. Received 15 November 1999. We thank P.W. Anderson, R.N. Bhatt, F.D.M. Haldane, M. Hastings, A. Madhav, R. Moessner, S. Sachdev, T. Senthil, S.L. Sondhi, and A. Vishwanath for useful discussions. This work was supported by NSF Grants No. DMR-9809483 and No. DMR-9802468.
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Issue or Number:15
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ID Code:7099
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Deposited On:09 Jan 2007
Last Modified:08 Nov 2021 20:39

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