Return probability after a quench from a domain wall initial state in the spin-1/2 XXZ chain

Abstract

We study the return probability and its imaginary ($\tau$) time continuation after a quench from a domain wall initial state in the XXZ spin chain, focusing mainly on the region with anisotropy $|\Delta |<1$. We establish exact Fredholm determinant formulas for those, by exploiting a connection to the six vertex model with domain wall boundary conditions. In imaginary time, we find the expected scaling for a partition function of a statistical mechanical model of area proportional to ${\tau }^2$, which reflects the fact that the model exhibits the limit shape phenomenon. In real time, we observe that in the region $|\Delta |<1$ the decay for large times $t$ is nowhere continuous as a function of anisotropy: it is either gaussian at root of unity or exponential otherwise. As an aside, we also determine that the front moves as $x_{\mathrm{f}}(t)=t\sqrt{1-{\Delta }^2}$, by analytic continuation of known arctic curves in the six vertex model. Exactly at $|\Delta |=1$, we find the return probability decays as $e^{-\zeta (3/2)\sqrt{t/\pi }}{t}^{1/2}O(1)$. It is argued that this result provides an upper bound on spin transport. In particular, it suggests that transport should be diffusive at the isotropic point for this quench.

33 pages, 8 figures. v2: typos fixed, references added. v3: minor changes

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Cited by in corpus (49)

• Kinetic theory of spin diffusion and superdiffusion in XXZ spin chains
• What is an integrable quench?
• Analytic solution of the Domain Wall non-equilibrium stationary state
• Super-diffusion in one-dimensional quantum lattice models
• Integrable Trotterization: Local Conservation Laws and Boundary Driving
• Superdiffusion in spin chains
• Entanglement and quantum transport in integrable systems
• Dynamics of magnetization at infinite temperature in a Heisenberg spin chain
• Dynamics of the spin-1/2 Heisenberg chain initialized in a domain-wall state
• Domain wall dynamics in the Landau--Lifshitz magnet and the classical-quantum correspondence for spin transport
• Spin-charge separation effects in the low-temperature transport of 1D Fermi gases
• Fredholm determinants, full counting statistics and Loschmidt echo for domain wall profiles in one-dimensional free fermionic chains
• Domain wall problem in the quantum XXZ chain and semiclassical behavior close to the isotropic point
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• Magnetization and entanglement after a geometric quench in the XXZ chain
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• Domain wall melting in spin-1 chains
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• Current fluctuations in the Dyson Gas
• KPZ fluctuations in finite volume
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