3 results match your criteria: "Institute of Theoretical Physics and Center for Dynamics[Affiliation]"
Quantum Transport through Partial Barriers in Higher-Dimensional Systems.
Phys Rev Lett
January 2024
TU Dresden, Institute of Theoretical Physics and Center for Dynamics, 01062 Dresden, Germany.
Partial transport barriers in the chaotic sea of Hamiltonian systems influence classical transport, as they allow for a small flux between chaotic phase-space regions only. We find for higher-dimensional systems that quantum transport through such a partial barrier is more restrictive than expected from two-dimensional maps. We establish a universal transition from quantum suppression to mimicking classical transport.
View Article and Find Full Text PDFCharacterizing quantum chaoticity of kicked spin chains.
Phys Rev E
October 2023
TU Dresden, Institute of Theoretical Physics and Center for Dynamics, 01062 Dresden, Germany.
Quantum many-body systems are commonly considered as quantum chaotic if their spectral statistics, such as the level spacing distribution, agree with those of random matrix theory (RMT). Using the example of the kicked Ising chain we demonstrate that even if both level spacing distribution and eigenvector statistics agree well with random matrix predictions, the entanglement entropy deviates from the expected RMT behavior, i.e.
View Article and Find Full Text PDFClassical Drift in the Arnold Web Induces Quantum Delocalization Transition.
Phys Rev Lett
November 2023
TU Dresden, Institute of Theoretical Physics and Center for Dynamics, 01062 Dresden, Germany.
Article Synopsis
- Quantum dynamical localization in higher-dimensional Hamiltonian systems can be disrupted by classical drift, allowing quantum wave packets to explore more of the Arnold web than previously thought.
- This classical drift happens when resonance channels expand, leading towards chaotic regions or intersections with other channels, which can eliminate dynamical localization under strong conditions.
- The study shows that this drift-induced transition to delocalization is universal, characterized by a single transition parameter, with numerical evidence provided through simulations of a kicked Hamiltonian in a four-dimensional phase space.