118 citations · 820 across the 28 of their papers we have counts for
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Exact dynamics in the inhomogeneous central-spin model
Michael Bortz, Joachim Stolze
We study the dynamics of a single spin-1/2 coupled to a bath of spins-1/2 by inhomogeneous Heisenberg couplings including a central magnetic field. This central-spin model describe…
String correlation functions of the spin-1/2 Heisenberg XXZ chain
Michael Bortz, Jun Sato, Masahiro Shiroishi
We calculate certain string correlation functions, originally introduced as order parameters in integer spin chains, for the spin-1/2 XXZ Heisenberg chain at zero temperature and i…
Low-temperature asymptotics of integrable systems in an external field
Michael Bortz
An asymptotic low-temperature expansion is performed for an integrable bosonic lattice model and for the critical spin-1/2 Heisenberg chain in a magnetic field. The results apply t…
Spin- and entanglement-dynamics in the central spin model with homogeneous couplings
Michael Bortz, Joachim Stolze
We calculate exactly the time-dependent reduced density matrix for the central spin in the central-spin model with homogeneous Heisenberg couplings. Therefrom, the dynamics and the…
Finite temperature Drude weight of an integrable Bose chain
Michael Bortz
We study the Drude weight at finite temperatures of an integrable bosonic model where the particles interact via nearest-neighbour coupling on a chain. At low temperatur…
The q-deformed Bose gas: Integrability and thermodynamics
Michael Bortz, Sergey Sergeev
We investigate the exact solution of the q-deformed one-dimensional Bose gas to derive all integrals of motion and their corresponding eigenvalues. As an application, the thermodyn…