Volume 125, Number 1, January 2019
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||11 January 2019|
Driving XXZ spin chains: Magnetic-field and boundary effects
Institut für Physik, Universität Greifswald - D-17487 Greifswald, Germany
Received: 17 October 2018
Accepted: 11 December 2018
Using the time-evolving block decimation, we study the spin transport through spin-(1/2) and spin-1 XXZ chains subjected to an external magnetic field and contacted to noninteracting fermionic leads. For generic system-lead couplings, the spin conductance exhibits several resonances as a function of the magnetic-field strength. In the spin-(1/2) but not the spin-1 case, the coupling to the leads can be fine-tuned to reach a conducting fixed point, where the peak structure is washed out and the spin conductance is large throughout the gapless Luttinger-liquid phase. For the Haldane phase of the spin-1 chain, we analyse how the spin transport is affected by spin-(1/2) edge states, and argue that two-impurity Kondo physics is realised.
PACS: 72.25.Mk – Spin transport through interfaces / 75.10.Pq – Spin chain models / 75.76.+j – Spin transport effects
© EPLA, 2019
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