Zobrazeno 1 - 10
of 82
pro vyhledávání: '"Heinz-Jürgen Schmidt"'
Autor:
Martin Gembé, Heinz-Jürgen Schmidt, Ciarán Hickey, Johannes Richter, Yasir Iqbal, Simon Trebst
Publikováno v:
Physical Review Research, Vol 5, Iss 4, p 043204 (2023)
Motivated by the recent synthesis of a number of Mott insulating square-kagome materials, we explore the rich phenomenology of frustrated magnetism induced by this lattice geometry, also referred to as the squagome or shuriken lattice. On the classic
Externí odkaz:
https://doaj.org/article/b72d4d3a6b5a4b2d8310dee68222e61c
Autor:
Heinz-Jürgen Schmidt, Jochen Gemmer
Publikováno v:
Entropy, Vol 25, Iss 3, p 504 (2023)
We consider a situation where an N-level system (NLS) is coupled successively to two heat baths with different temperatures without being necessarily thermalized and approaches a steady state. For this situation we apply a general Jarzynski-type equa
Externí odkaz:
https://doaj.org/article/d7ca09157175471bb7cc7a5f31f93af5
Autor:
Heinz-Jürgen Schmidt
Publikováno v:
Entropy, Vol 23, Iss 3, p 289 (2021)
We consider state changes in quantum theory due to “conditional action” and relate these to the discussion of entropy decrease due to interventions of “intelligent beings” and the principles of Szilard and Landauer/Bennett. The mathematical t
Externí odkaz:
https://doaj.org/article/012ae12cb2a9423086ae9bcdd33202c7
Publikováno v:
New Journal of Physics, Vol 23, Iss 8, p 083038 (2021)
Equilibration of observables in closed quantum systems that are described by a unitary time evolution is a meanwhile well-established phenomenon apart from a few equally well-established exceptions. Here we report the surprising theoretical observati
Externí odkaz:
https://doaj.org/article/1a4ab62e5e1144b09a88e6147b52aecd
Publikováno v:
Physical Review Research, Vol 2, Iss 2, p 023293 (2020)
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 demonstrate that even the sign of the resulting mean magnetization depend
Externí odkaz:
https://doaj.org/article/c8d9dd419b2a44dca5a3a36c31e6e6a2
Autor:
Heinz-Jürgen Schmidt, Thomas Bröcker
Publikováno v:
European Journal of Physics. 44:035201
According to the Maxwell equations in its standard form the sources of the magnetic field are electric currents. But modern physics has discovered that another source of the magnetic field of, say, ferromagnets is the spin of unpaired electrons. This
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::38b25a596024a02948a52e86f20be991
https://doi.org/10.1088/1361-6404/acc5c4
https://doi.org/10.1088/1361-6404/acc5c4
Autor:
Heinz-Jürgen Schmidt
Publikováno v:
Zeitschrift für Naturforschung A. 75:937-962
We consider the solution of the equation of motion of a classical/quantum spin subject to a monochromatical, elliptically polarized external field. The classical Rabi problem can be reduced to third order differential equations with polynomial coeffi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f5e793efcee9b2498fdc324dcca524f0
https://doi.org/10.1515/zna-2020-0181
https://doi.org/10.1515/zna-2020-0181
Autor:
Heinz-Jürgen Schmidt
Publikováno v:
Zeitschrift für Naturforschung A. 75:381-391
We investigate the motion of a classical spin processing around a periodic magnetic field using Floquet theory, as well as elementary differential geometry and considering a couple of examples. Under certain conditions, the role of spin and magnetic
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9ca5abc637bd9501530999933e0a6abf
https://doi.org/10.1515/zna-2019-0352
https://doi.org/10.1515/zna-2019-0352
Autor:
Heinz-Jürgen Schmidt
Publikováno v:
Foundations of Physics. 51
The article “Conditional Action and Quantum Versions of Maxwell’s Demon”, written by Heinz‑Jurgen Schmidt, was originally published electronically on the publisher’s internet portal on 30 September 2020 without open access. With the author(
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d330383d1f39d5bdd9ef83bec7bd1a7d
https://doi.org/10.1007/s10701-021-00502-4
https://doi.org/10.1007/s10701-021-00502-4
Autor:
Heinz-Jürgen Schmidt, Johannes Richter
Publikováno v:
Journal of Physics A
We present a generalization of the Luttinger-Tisza-Lyons-Kaplan (LTLK) theory of classical ground states of Bravais lattices with Heisenberg coupling to non-Bravais lattices. It consists of adding certain Lagrange parameters to the diagonal of the Fo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::92ff3b618701c721087c01dddfb47654
https://doi.org/10.1088/1751-8121/aca36d
https://doi.org/10.1088/1751-8121/aca36d