Asymmetry in energy versus spin transport in certain interacting, disordered systems

Juan Jose Mendoza-Arenas, Marko Znidaric, Vipin Kerala Varma, John Goold, Stephen R. Clark, Antonello Scardicchio

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

We study energy transport in disordered XXZ spin-1/2 chains driven to nonequilibrium configurations by thermal reservoirs of different temperatures at the boundaries, using large-scale matrix product simulations. In particular we discuss the transition between diffusive and subdiffusive transport in sectors of zero and finite magnetization at high temperature. At large anisotropies we find that diffusive energy transport prevails over a large range of disorder strengths, which is in contrast to spin transport that is subdiffusive in the same regime for weak disorder. However, at finite magnetization both energy and spin currents decay as a function of the system size with the same exponent. We conclude that diffusion of energy is much more pervasive than that of magnetization in these disordered spin-1/2 systems, and occurs across a significant range of the interaction-disorder parameter phase space. We support the existence of this asymmetry, reminiscent of that in the clean limit, by an analytical estimation of diffusion constants for weak disorder.

Original languageEnglish
Article number094435
JournalPhysical Review Letters
Volume99
Issue number9
DOIs
Publication statusPublished - 22 Mar 2019

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asymmetry
disorders
magnetization
energy
conservation laws
sectors
exponents
anisotropy
decay
configurations
interactions
temperature

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Mendoza-Arenas, J. J., Znidaric, M., Varma, V. K., Goold, J., Clark, S. R., & Scardicchio, A. (2019). Asymmetry in energy versus spin transport in certain interacting, disordered systems. Physical Review Letters, 99(9), [094435]. https://doi.org/10.1103/PhysRevB.99.094435

Asymmetry in energy versus spin transport in certain interacting, disordered systems. / Mendoza-Arenas, Juan Jose; Znidaric, Marko; Varma, Vipin Kerala; Goold, John; Clark, Stephen R.; Scardicchio, Antonello.

In: Physical Review Letters, Vol. 99, No. 9, 094435, 22.03.2019.

Research output: Contribution to journalArticle

Mendoza-Arenas, JJ, Znidaric, M, Varma, VK, Goold, J, Clark, SR & Scardicchio, A 2019, 'Asymmetry in energy versus spin transport in certain interacting, disordered systems', Physical Review Letters, vol. 99, no. 9, 094435. https://doi.org/10.1103/PhysRevB.99.094435
Mendoza-Arenas JJ, Znidaric M, Varma VK, Goold J, Clark SR, Scardicchio A. Asymmetry in energy versus spin transport in certain interacting, disordered systems. Physical Review Letters. 2019 Mar 22;99(9). 094435. https://doi.org/10.1103/PhysRevB.99.094435
Mendoza-Arenas, Juan Jose ; Znidaric, Marko ; Varma, Vipin Kerala ; Goold, John ; Clark, Stephen R. ; Scardicchio, Antonello. / Asymmetry in energy versus spin transport in certain interacting, disordered systems. In: Physical Review Letters. 2019 ; Vol. 99, No. 9.
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