English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT

Released

Journal Article

Asymmetry in energy versus spin transport in certain interacting disordered systems

MPS-Authors
/persons/resource/persons196879

Clark,  S. R.
H.H. Wills Physics Laboratory, University of Bristol;
Quantum Condensed Matter Dynamics, Condensed Matter Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

Fulltext (public)

PhysRevB.99.094435.pdf
(Publisher version), 615KB

Supplementary Material (public)

Supplemental_Material_Final.pdf
(Supplementary material), 224KB

Citation

Mendoza-Arenas, J. J., Žnidarič, 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 B, 99(9): 094435. doi:10.1103/PhysRevB.99.094435.


Cite as: http://hdl.handle.net/21.11116/0000-0003-5D4C-1
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.