Zobrazeno 1 - 10
of 33
pro vyhledávání: '"Knipschild, Lars"'
Publikováno v:
Phys. Rev. E 103, 062139 (2021)
We consider closed quantum systems (into which baths may be integrated) that are driven, i.e., subject to time-dependent Hamiltonians. As a starting point we assume that, for systems initialized in microcanonical states at some energies, the resultin
Externí odkaz:
http://arxiv.org/abs/2007.11829
Publikováno v:
Zeitschrift f\"ur Naturforschung A, 20200034 (De Gruyter, 2020)
Evidently, some relaxation dynamics, e.g. exponential decays, are much more common in nature than others. Recently there have been attempts to explain this observation on the basis of ``typicality of perturbations'' with respect to their impact on ex
Externí odkaz:
http://arxiv.org/abs/2004.13428
Autor:
Knipschild, Lars, Gemmer, Jochen
Publikováno v:
Phys. Rev. E 101, 062205 (2020)
Numerous pivotal concepts have been introduced to clarify the puzzle of relaxation and/or equilibration in closed quantum systems. All of these concepts rely in some way on specific conditions on Hamiltonians $H$, observables $A$, and initial states
Externí odkaz:
http://arxiv.org/abs/2002.01710
Putting a general, physically relevant upper bound on equilibration times in closed quantum systems is a recently much pursued endeavor. In PRX, 7, 031027 (2017) Garc\'{\i}a-Pintos et al. suggest such a bound. We point out that the general assumption
Externí odkaz:
http://arxiv.org/abs/1910.13262
Autor:
Richter, Jonas, Jin, Fengping, Knipschild, Lars, De Raedt, Hans, Michielsen, Kristel, Gemmer, Jochen, Steinigeweg, Robin
Publikováno v:
Phys. Rev. E 101, 062133 (2020)
Given a quantum many-body system and the expectation-value dynamics of some operator, we study how this reference dynamics is altered due to a perturbation of the system's Hamiltonian. Based on projection operator techniques, we unveil that if the pe
Externí odkaz:
http://arxiv.org/abs/1906.09268
Autor:
Knipschild, Lars, Gemmer, Jochen
Publikováno v:
Phys. Rev. A 99, 012118, Published 16 January 2019
According to the eigenstate thermalization ansatz, matrices representing generic few body observables take on a specific form when displayed in the eigenbasis of a chaotic Hamiltonian. We examine the effect of environmental induced decoherence on the
Externí odkaz:
http://arxiv.org/abs/1903.00302
Autor:
Richter, Jonas, Jin, Fengping, Knipschild, Lars, Herbrych, Jacek, De Raedt, Hans, Michielsen, Kristel, Gemmer, Jochen, Steinigeweg, Robin
Publikováno v:
Phys. Rev. B 99, 144422 (2019)
The dynamics of magnetization and energy densities are studied in the two-leg spin-1/2 ladder. Using an efficient pure-state approach based on the concept of typicality, we calculate spatio-temporal correlation functions for large systems with up to
Externí odkaz:
http://arxiv.org/abs/1811.02806
Autor:
Knipschild, Lars, Gemmer, Jochen
Publikováno v:
Phys. Rev. E 98, 062103 (2018)
Concepts like `typicality' and the `eigenstate thermalization hypothesis' aim at explaining the apparent equilibration of quantum systems, possibly after a very long time. However, these concepts are not concerned with the specific way in which this
Externí odkaz:
http://arxiv.org/abs/1811.00381
We comment on: E. Iyoda, K. Kaneko, and T. Sagawa, "Fluctuation Theorem for Many-Body Pure Quantum States", Phys. Rev. Lett. 119, 100601 (2017). We also respond to the reply by the afore mentioned authors: "arXiv:1712.05172". The response at hand con
Externí odkaz:
http://arxiv.org/abs/1712.02128
Publikováno v:
Phys. Rev. E 98, 012123 (2018)
We consider closed quantum systems (into which baths may be integrated) that are driven, i.e., subject to time-dependent Hamiltonians. Our point of departure is the assumption that, if systems start in microcanonical states at some initial energies,
Externí odkaz:
http://arxiv.org/abs/1710.10871