190 citations · 251 across the 15 of their papers we have counts for
16 papers
Correspondence between Asymptotic Quantum Many-Body Scars in Closed Systems and Diffusive Nambu-Goldstone Modes in Open Systems
Masaya Kunimi, Taiki Haga, Masaya Nakagawa
Hydrodynamic relaxation in open quantum many-body systems can be understood in terms of diffusive Nambu--Goldstone (NG) modes associated with strong-to-weak spontaneous symmetry br…
Discontinuous strong-to-weak symmetry breaking transition from thermal pure states
Taiki Haga, Masaya Kunimi, Masaya Nakagawa
We investigate the nonequilibrium dynamics of strong-to-weak spontaneous symmetry breaking in many-body quantum systems undergoing decoherence from thermal pure states. For generic…
Spontaneous symmetry breaking in non-steady modes of open quantum many-body systems
Taiki Haga
In a quantum many-body system coupled to the environment, its steady state can exhibit spontaneous symmetry breaking when a control parameter exceeds a critical value. In this stud…
Quasiparticles of Decoherence Processes in Open Quantum Many-Body Systems: Incoherentons
Taiki Haga, Masaya Nakagawa, Ryusuke Hamazaki +1
The relaxation dynamics of an open quantum system is determined by the competition between the coherent Hamiltonian dynamics of a system and the dissipative dynamics due to interac…
Lindbladian Many-Body Localization
Ryusuke Hamazaki, Masaya Nakagawa, Taiki Haga +1
We discover a novel localization transition that alters the dynamics of coherence in disordered many-body spin systems subject to Markovian dissipation. The transition occurs in th…
Interscale entanglement production in a quantum system simulating classical chaos
Taiki Haga, Shin-ichi Sasa
It is a fundamental problem how the universal concept of classical chaos emerges from the microscopic description of quantum mechanics. We here study standard classical chaos in a…
Emergence of surface long-range order under uniform shear flow
Hiroyoshi Nakano, Yuki Minami, Taiki Haga +1
We study the two-dimensional surface long-range order in a non-equilibrium steady state under shear flow using the three-dimensional conserved model. Whereas the correlation…
Liouvillian Skin Effect: Slowing Down of Relaxation Processes without Gap Closing
Taiki Haga, Masaya Nakagawa, Ryusuke Hamazaki +1
It is highly nontrivial to what extent we can deduce the relaxation behavior of a quantum dissipative system from the spectral gap of the Liouvillian that governs the time evolutio…
Effective temperature of a superfluid flowing in a random potential
Taiki Haga, Masahito Ueda
The spatial fluctuations of a superfluid flowing in a weak random potential are investigated. We employ classical field theory to demonstrate that the disorder-averaged nonequilibr…
Divergence of the Floquet-Magnus expansion in a periodically driven one-body system with energy localization
Taiki Haga
The Floquet-Magnus expansion is a useful tool to calculate an effective Hamiltonian for periodically driven systems. In this study, we investigate the convergence of the expansion…
Dimensional reduction in driven disordered systems
Taiki Haga
We investigate the critical behavior of disordered systems transversely driven at a uniform and steady velocity. An intuitive argument predicts that the long-distance physics of $D…
Dimensional reduction and its breakdown in the driven random field O(N) model
Taiki Haga
The critical behavior of the random field model driven at a uniform velocity is investigated at zero-temperature. From naive phenomenological arguments, we introduce a dimen…
Nonequilibrium Kosterlitz-Thouless transition in a three-dimensional driven disordered system
Taiki Haga
We demonstrate a three-dimensional Kosterlitz-Thouless (KT) transition in the random field XY model driven out of thermal equilibrium. By employing the spin-wave approximation and…
Bogoliubov Theory for a Superfluid Bose Gas Flowing in a Random Potential: Stability and Critical Velocity
Taiki Haga
We investigate the stability and critical velocity of a weakly interacting Bose gas flowing in a random potential. By applying the Bogoliubov theory to a disordered Bose system wit…
Non-equilibrium quasi-long-range order of driven random field O(N) model
Taiki Haga
We investigate three-dimensional O(N) spin models driven with a uniform velocity over a random field. Within a spin-wave approximation, it is shown that in the strong driving regim…
Nonequilibrium Langevin equation and effective temperature for particle interacting with spatially extended environment
Taiki Haga
We investigate a novel type of Langevin model that describes the nonequilibrium dynamics of a classical particle interacting with a spatially extended environment. In this model, a…