Jacek Herbrych

Eigenstate thermalization within isolated spin-chain systems

The thermalization phenomenon and many-body quantum statistical properties are studied on the example of several observables in isolated spin-chain systems, both integrable and generic nonintegrable. While diagonal matrix elements for nonintegrable models comply with the eigenstate thermalization hypothesis, the integrable systems show evident deviations and similarity to properties of noninteracting many-fermion models. The finite-size scaling reveals that the crossover between the two regimes is given by a scale closely related to the scattering length. Low-frequency off-diagonal matrix elements related to dc transport quantities also follow in a generic system a behavior analogous to the eigenstate thermalization hypothesis, however, unrelated to one of the diagonal matrix elements.

Typicality approach to the optical conductivity in thermal and many-body localized phases

We study the frequency dependence of the optical conductivity

Finite-temperature Drude weight within the anisotropic Heisenberg chain

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Universal dynamics of density correlations at the transition to the many-body localized state

of the Heisenberg spin-

Heat Conductivity of the Heisenberg Spin-1/2 Ladder: From Weak to Strong Breaking of Integrability

\frac{1}{2}

Interaction-induced weakening of localization in few-particle disordered Heisenberg chains

chain in the thermal and near the transition to the many-body localized phase induced by the strength of a random

Density matrix renormalization group study of a three-orbital Hubbard model with spin-orbit coupling in one dimension

z

Spin hydrodynamics in theS=12anisotropic Heisenberg chain

-directed magnetic field. Using the method of dynamical quantum typicality, we calculate the real-time dynamics of the spin-current autocorrelation function and obtain the Fourier transform

Possible bicollinear nematic state with monoclinic lattice distortions in iron telluride compounds

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Efficiency of fermionic quantum distillation

for system sizes much larger than accessible to standard exact-diagonalization approaches. We find that the low-frequency behavior of