90 citations · 784 across the 34 of their papers we have counts for
29 papers · 1 filter
Transport and integrability-breaking in non-Hermitian many-body quantum systems
Dylan E. Mahoney, Jonas Richter
Describing open quantum systems in terms of effective non-Hermitian Hamiltonians gives rise to non-unitary time evolution. In this paper, we study the impact of non-unitary dynamic…
Lindblad dynamics from spatio-temporal correlation functions in nonintegrable spin-1/2 chains with different boundary conditions
Markus Kraft, Jonas Richter, Fengping Jin +6
We investigate the Lindblad equation in the context of boundary-driven magnetization transport in spin- chains. Our central question is whether the nonequilibrium steady state…
Emergence of unitary symmetry of microcanonically truncated operators in chaotic quantum systems
Jiaozi Wang, Jonas Richter, Mats H. Lamann +3
We study statistical properties of matrix elements of observables written in the energy eigenbasis and truncated to small microcanonical windows. We present numerical evidence indi…
Hydrodynamics in long-range interacting systems with center-of-mass conservation
Alan Morningstar, Nicholas O'Dea, Jonas Richter
In systems with a conserved density, the additional conservation of the center of mass (dipole moment) has been shown to slow down the associated hydrodynamics. At the same time, l…
Spin-1/2 XXZ chain coupled to two Lindblad baths: Constructing nonequilibrium steady states from equilibrium correlation functions
Tjark Heitmann, Jonas Richter, Fengping Jin +7
State-of-the-art approaches to extract transport coefficients of many-body quantum systems broadly fall into two categories: (i) they target the linear-response regime in terms of…
Real-time broadening of bath-induced density profiles from closed-system correlation functions
Tjark Heitmann, Jonas Richter, Jacek Herbrych +2
The Lindblad master equation is one of the main approaches to open quantum systems. While it has been widely applied in the context of condensed matter systems to study properties…
Spatiotemporal dynamics of classical and quantum density profiles in low-dimensional spin systems
Tjark Heitmann, Jonas Richter, Fengping Jin +3
We provide a detailed comparison between the dynamics of high-temperature spatiotemporal correlation functions in quantum and classical spin models. In the quantum case, our large-…
Transport and entanglement growth in long-range random Clifford circuits
Jonas Richter, Oliver Lunt, Arijeet Pal
Conservation laws can constrain entanglement dynamics in isolated quantum systems, manifest in a slowdown of higher Rényi entropies. Here, we explore this phenomenon in a class of…
Many-body localization and delocalization dynamics in the thermodynamic limit
Jonas Richter, Arijeet Pal
Disordered quantum systems undergoing a many-body localization (MBL) transition fail to reach thermal equilibrium under their own dynamics. Distinguishing between asymptotically lo…
Eigenstate thermalization hypothesis and its deviations from random-matrix theory beyond the thermalization time
Jiaozi Wang, Mats H. Lamann, Jonas Richter +3
The Eigenstate Thermalization Hypothesis (ETH) explains emergence of the thermodynamic equilibrium by assuming a particular structure of observable's matrix elements in the energy…
Anomalous hydrodynamics in a class of scarred frustration-free Hamiltonians
Jonas Richter, Arijeet Pal
Atypical eigenstates in the form of quantum scars and fragmentation of Hilbert space due to conservation laws provide obstructions to thermalization in the absence of disorder. In…
Quantum versus Classical Dynamics in Spin Models: Chains, Ladders, and Square Lattices
Dennis Schubert, Jonas Richter, Fengping Jin +3
We present a comprehensive comparison of spin and energy dynamics in quantum and classical spin models on different geometries, ranging from one-dimensional chains, over quasi-one-…
Quantum scars and bulk coherence in a symmetry-protected topological phase
Jared Jeyaretnam, Jonas Richter, Arijeet Pal
Formation of quantum scars in many-body systems provides a novel mechanism for enhancing coherence of weakly entangled states. At the same time, coherence of edge modes in certain…
Nontrivial damping of quantum many-body dynamics
Tjark Heitmann, Jonas Richter, Jochen Gemmer +1
Understanding how the dynamics of a given quantum system with many degrees of freedom is altered by the presence of a generic perturbation is a notoriously difficult question. Rece…
Simulating hydrodynamics on noisy intermediate-scale quantum devices with random circuits
Jonas Richter, Arijeet Pal
In a recent milestone experiment, Google's processor Sycamore heralded the era of "quantum supremacy" by sampling from the output of (pseudo-)random circuits. We show that such ran…
Eigenstate thermalization hypothesis beyond standard indicators: Emergence of random-matrix behavior at small frequencies
Jonas Richter, Anatoly Dymarsky, Robin Steinigeweg +1
Using numerical exact diagonalization, we study matrix elements of a local spin operator in the eigenbasis of two different nonintegrable quantum spin chains. Our emphasis is on th…
Quantum quench dynamics in the transverse-field Ising model: A numerical expansion in linked rectangular clusters
Jonas Richter, Tjark Heitmann, Robin Steinigeweg
We study quantum quenches in the transverse-field Ising model defined on different lattice geometries such as chains, two- and three-leg ladders, and two-dimensional square lattice…
Temporal relaxation of gapped many-body quantum systems
Peter Reimann, Ben N. Balz, Jonas Richter +1
Typicality of the orthogonal dynamics (TOD) is established as a generic feature of temporal relaxation processes in isolated many-body quantum systems. The basic idea in the simple…
Finite-size scaling of typicality-based estimates
J. Schnack, J. Richter, T. Heitmann +1
According to the concept of typicality, an ensemble average can be accurately approximated by an expectation value with respect to a single pure state drawn at random from a high-d…
Selected applications of typicality to real-time dynamics of quantum many-body systems
Tjark Heitmann, Jonas Richter, Dennis Schubert +1
Loosely speaking, the concept of quantum typicality refers to the fact that a single pure state can imitate the full statistical ensemble. This fact has given rise to a rather simp…
Decay of spin-spin correlations in disordered quantum and classical spin chains
Jonas Richter, Dennis Schubert, Robin Steinigeweg
The real-time dynamics of equal-site correlation functions is studied for one-dimensional spin models with quenched disorder. Focusing on infinite temperature, we present a compari…
Magnetization dynamics in clean and disordered spin-1 XXZ chains
Jonas Richter, Niklas Casper, Wolfram Brenig +1
We study spin transport in the one-dimensional anisotropic S = 1 Heisenberg model. Particular emphasis is given to dynamics at infinite temperature, where current autocorrelations…
Exponential damping induced by random and realistic perturbations
Jonas Richter, Fengping Jin, Lars Knipschild +4
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 Hamilton…
Relaxation of dynamically prepared out-of-equilibrium initial states within and beyond linear response theory
Jonas Richter, Mats H. Lamann, Christian Bartsch +2
We consider a realistic nonequilibrium protocol, where a quantum system in thermal equilibrium is suddenly subjected to an external force. Due to this force, the system is driven o…