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Universal phenomenology at critical exceptional points of nonequilibrium models
Carl Philipp Zelle, Romain Daviet, Achim Rosch +1
In thermal equilibrium the dynamics of phase transitions is largely controlled by fluctuation-dissipation relations: On the one hand, friction suppresses fluctuations, while on the…
Monitored Open Fermion Dynamics: Exploring the Interplay of Measurement, Decoherence, and Free Hamiltonian Evolution
B. Ladewig, S. Diehl, M. Buchhold
The interplay of unitary evolution and local measurements in many-body systems gives rise to a stochastic state evolution and to measurement-induced phase transitions in the pure s…
Topological gauge theory for mixed Dirac stationary states in all dimensions
Ze-Min Huang, Xiao-Qi Sun, Sebastian Diehl
We derive the universal real time topological gauge field action for mixed quantum states of weakly correlated fermions in all dimensions, and demonstrate its independence o…
Measurement-induced dark state phase transitions in long-ranged fermion systems
Thomas Müller, Sebastian Diehl, Michael Buchhold
We identify an unconventional algebraic scaling phase in the quantum dynamics of free fermions with long range hopping, which are exposed to continuous local density measurements.…
Effective Theory for the Measurement-Induced Phase Transition of Dirac Fermions
M. Buchhold, Y. Minoguchi, A. Altland +1
A wave function exposed to measurements undergoes pure state dynamics, with deterministic unitary and probabilistic measurement induced state updates, defining a quantum trajectory…
Kibble-Zurek mechanism from different angles: The transverse XY model and subleading scalings
Björn Ladewig, Steven Mathey, Sebastian Diehl
The Kibble-Zurek mechanism describes the saturation of critical scaling upon dynamically approaching a phase transition. This is a consequence of the breaking of adiabaticity due t…
Dynamic renormalization group theory for open Floquet systems
Steven Mathey, Sebastian Diehl
We develop a comprehensive Renormalization Group (RG) approach to criticality in open Floquet systems, where dissipation enables the system to reach a well-defined Floquet steady s…
Entanglement transition in a monitored free fermion chain -- from extended criticality to area law
Ori Alberton, Michael Buchhold, Sebastian Diehl
We analyze the quantum trajectory dynamics of free fermions subject to continuous monitoring. For weak monitoring, we identify a novel dynamical regime of subextensive entanglement…
Topological Field Theory far from Equilibrium
Federico Tonielli, Jan Carl Budich, Alexander Altland +1
The observable properties of topological quantum matter are often described by topological field theories. We here demonstrate that this principle extends beyond thermal equilibriu…
Activating critical exponent spectra with a slow drive
Steven Mathey, Sebastian Diehl
We uncover an aspect of the Kibble--Zurek phenomenology, according to which the spectrum of critical exponents of a classical or quantum phase transition is revealed, by driving th…
Absence of Criticality in the Phase Transitions of Open Floquet Systems
Steven Mathey, Sebastian Diehl
We address the nature of phase transitions in periodically driven systems coupled to a bath. The latter enables a synchronized non-equilibrium Floquet steady state at finite entrop…
Phenomenology of a First Order Dark State Phase Transition
Dietrich Roscher, Sebastian Diehl, Michael Buchhold
Dark states are stationary states of a dissipative, Lindblad-type time evolution with zero von Neumann entropy, therefore representing examples of pure, steady quantum states. Non-…
Miscible-Immiscible Transition and Nonequilibrium Scaling in Two-Component Driven Open Condensate Wires
Liang He, Sebastian Diehl
We investigate the steady state phase diagram of two-component driven open condensates in one dimension. We identify a miscible-immiscible transition which is predominantly driven…
Dynamical crossovers in prethermal critical states
Alessio Chiocchetta, Andrea Gambassi, Sebastian Diehl +1
We study the prethermal dynamics of an interacting quantum field theory with a N-component order parameter and symmetry, suddenly quenched in the vicinity of a dynamical cri…
Space-time vortex driven crossover and vortex turbulence phase transition in one-dimensional driven open condensates
Liang He, Lukas M. Sieberer, Sebastian Diehl
We find a first order transition driven by the strength of non-equilibrium conditions of one-dimensional driven open condensates. Associated with this transition is a new stable no…
Universal short-time dynamics: boundary functional renormalization group for a temperature quench
Alessio Chiocchetta, Andrea Gambassi, Sebastian Diehl +1
We present a method to calculate short-time non-equilibrium universal exponents within the functional renormalization-group scheme. As an example, we consider the classical critica…
Background Field Functional Renormalization Group for Absorbing State Phase Transitions
Michael Buchhold, Sebastian Diehl
We present a functional renormalization group approach for the active to inactive phase transition in directed percolation type systems, in which the transition is approached from…
Absorbing state phase transition with competing quantum and classical fluctuations
M. Marcuzzi, M. Buchhold, S. Diehl +1
Stochastic processes with absorbing states feature remarkable examples of non-equilibrium universal phenomena. While a broad understanding has been progressively established in the…
The average number of distinct sites visited by a random walker on random graphs
Caterina De Bacco, Satya N. Majumdar, Peter Sollich
We study the linear large behavior of the average number of distinct sites visited by a random walker after steps on a large random graph. An expression for the grap…
Scaling properties of one-dimensional driven-dissipative condensates
Liang He, Lukas M. Sieberer, Ehud Altman +1
We numerically investigate the scaling properties of a one-dimensional driven-dissipative condensate described by a stochastic complex Ginzburg-Landau equation (SCGLE). We directly…
Universal non-equilibrium properties of dissipative Rydberg gases
M. Marcuzzi, E. Levi, S. Diehl +2
We investigate the out-of-equilibrium behavior of a dissipative gas of Rydberg atoms that features a dynamical transition between two stationary states characterized by different e…
Two-dimensional superfluidity of exciton-polaritons requires strong anisotropy
Ehud Altman, Lukas M. Sieberer, Leiming Chen +2
Fluids of exciton-polaritons, excitations of two dimensional quantum wells in optical cavities, show collective phenomena akin to Bose condensation. However, a fundamental differen…
Perturbative Field-Theoretical Renormalization Group Approach to Driven-Dissipative Bose-Einstein Criticality
Uwe C. Tauber, Sebastian Diehl
The universal critical behavior of the driven-dissipative non-equilibrium Bose-Einstein condensation transition is investigated employing the field-theoretical renormalization grou…
Three-body scattering from nonperturbative flow equations
S. Diehl, H. C. Krahl, M. Scherer
We consider fermion-dimer scattering in the presence of a large positive scattering length in the frame of functional renormalization group equations. A flow equation for the momen…