Singular transport in non-equilibrium strongly internal-coupled 1D tilted field spin-1/2 chain

TL;DR

This paper investigates energy transport in a non-equilibrium 1D spin-1/2 chain under tilted magnetic fields, revealing how non-dissipative spins can block heat flow and enable magnetic control of heat modulation.

Contribution

It provides an analytical study of energy transport in a dissipative Ising chain, showing how non-dissipative spins influence heat flow and enabling magnetic control of heat transport.

Findings

Non-dissipative spins decompose the chain into independent subchains.

Heat currents can be blocked by non-dissipative spins.

Magnetic field direction can control heat modulation.

Abstract

Non-equilibrium spin-chain systems have been attracting increasing interest in energy transport. This work studies a one-dimensional non-equilibrium Ising chain immersed in a tilted magnetic field, every spin contacts a Boson reservoir with the dissipative system-environment interaction. We analytically investigate the dynamics and the steady-state energy transport taking advantage of the Born-Markov-secular master equation. In the longitudinal field, one can find that the non dissipative $N^\prime$ spins decompose the spin chain into $N^\prime +1$ independent subchains and block the heat currents from the hot end to the cool end. Moreover, for the non-dissipative $\mu$th spin, its nearest two bulk spins become the nodal spins in the subchains and have the corresponding energy correction of $\pm J_{\mu-1,\mu}$ and $\pm J_{\mu,\mu+1}$ depending on the excited/ground state of the $\mu$th spin. Therefore, a magnetically controlled heat modulator can be designed by adjusting the direction of the magnetic field in which the non-dissipative spin is located. For the transverse field case, the whole Hilbert space of the chain can always be divided into two independent subspaces regardless of whether the bulk spin is dissipative. This work provides new insight into the dynamics and energy transport of the dissipative Ising model.