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Effects of impurities in spin Bose-metal phase on a two-leg triangular strip

Lai, Hsin-Hua and Motrunich, Olexei I. (2009) Effects of impurities in spin Bose-metal phase on a two-leg triangular strip. Physical Review B, 79 (23). Art. No. 235120. ISSN 1098-0121. doi:10.1103/PhysRevB.79.235120.

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We study the effects of nonmagnetic impurities in a spin Bose-metal (SBM) phase discovered in a two-leg triangular strip spin-1/2 model with ring exchanges (D. N. Sheng et al., arXiv:0902.4210). This phase is a quasi-one-dimensional (quasi-1D) descendant of a two-dimensional (2D) spin liquid with spinon Fermi sea and the present study aims at interpolating between the 1D and 2D cases. Different types of defects can be treated as local-energy perturbations, which we find are always relevant. As a result, a nonmagnetic impurity generically cuts the system into two decoupled parts. We calculate bond energy and local spin susceptibility near the defect, both of which can be measured in experiments. The spin Bose metal has dominant correlations at characteristic incommensurate wave vectors that are revealed near the defect. Thus, the bond energy shows a static texture oscillating as a function of distance from the defect and decaying as a slow power law. The local spin susceptibility also oscillates and actually increases as a function of distance from the defect, similar to the effect found in the 1D chain [S. Eggert and I. Affleck, Phys. Rev. Lett. 75, 934 (1995)]. We calculate the corresponding power-law exponents for the textures as a function of one Luttinger parameter of the SBM theory.

Item Type:Article
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Motrunich, Olexei I.0000-0001-8031-0022
Additional Information:© 2009 The American Physical Society. Received 14 March 2009; revised 21 May 2009; published 12 June 2009. We would like to thank D. N. Sheng and M. P. A. Fisher for collaborations and discussions. This research is supported by the A. P. Sloan Foundation.
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Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:boson systems, exchange interactions (electron), Fermi surface, impurities, ionisation potential, Luttinger liquid, magnetic susceptibility, spin systems
Issue or Number:23
Record Number:CaltechAUTHORS:20090827-141808367
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Official Citation:Effects of impurities in spin Bose-metal phase on a two-leg triangular strip Hsin-Hua Lai and Olexei I. Motrunich, Phys. Rev. B 79, 235120 (2009), DOI:10.1103/PhysRevB.79.235120
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15366
Deposited By: George Porter
Deposited On:11 Sep 2009 23:44
Last Modified:08 Nov 2021 23:18

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