128 citations · 793 across the 55 of their papers we have counts for
6 papers · 1 filter
Supersymmetric spin-phonon coupling prevents odd integer spins from quantum tunneling
K. Irländer, H. -J. Schmidt, J. Schnack
Quantum tunneling of the magnetization is a phenomenon that impedes the use of small anisotropic spin systems for storage purposes even at the lowest temperatures. Phonons, usually…
Environment-controlled Floquet-state paramagnetism
Onno R. Diermann, Heinz-Jürgen Schmidt, Jürgen Schnack +1
We study the response of ideal spin systems which are interacting with both a strong oscillating magnetic field, and a thermal environment, to a weak probing magnetic field. We dem…
Theory of ground states for classical Heisenberg spin systems VI
Heinz-Jürgen Schmidt, Wojciech Florek
We formulate part VI of a rigorous theory of ground states for classical, finite, Heisenberg spin systems. After recapitulating the central results of the parts I - V previously pu…
Conditional action and quantum versions of Maxwell's demon
Heinz-Jürgen Schmidt
We propose a new way of looking at the quantum Maxwell's demon problem in terms of conditional action. A "conditional action" on a system is a unitary time evolution, selected acco…
Theory of ground states for classical Heisenberg spin systems V
Heinz-Jürgen Schmidt, Wojciech Florek
We formulate part V of a rigorous theory of ground states for classical, finite, Heisenberg spin systems. After recapitulating the central results of the parts I - IV previously pu…
Sequential measurements and entropy
Heinz-Jürgen Schmidt, Jochen Gemmer
We sketch applications of the so-called J-equation to quantum information theory concerning fundamental properties of the von Neumann entropy. The J-equation has recently be propos…