12 citations · 51 across the 13 of their papers we have counts for
13 papers
Non-ergodic dynamical phase transition via a zero-mode exceptional point in a non-Markov atomic Josephson junction
Koichiro Furutani
Open quantum systems typically lose their initial memory due to the environmental decoherence resulting in thermalization. We demonstrate a striking breakdown of this paradigm in a…
Dynamical axion fields coupled with one-dimensional spinless fermions
Yuto Hosogi, Koichiro Furutani, Yuki Kawaguchi
We investigate coupled dynamics of spinless fermions on a one-dimensional lattice and spins on the links. When the hopping integral and the on-site potential of the fermions depend…
Interaction-induced dissipative quantum phase transition in a head-to-tail atomic Josephson junction
Koichiro Furutani, Luca Salasnich
We propose a dissipative phase transition in a head-to-tail Bose Josephson junction. The quantum phase transition has the same origin as the one in a resistively shunted Josephson…
Amplitude, phase, and topological fluctuations shaping the complex phase diagram of two-dimensional superconductors
Koichiro Furutani, Giovanni Midei, Andrea Perali +1
We study the amplitude and phase fluctuations of the Ginzburg-Landau quasiorder parameter for superconductors in two spatial dimensions. Starting from the mean-field critical tempe…
Predictive power of the Berezinskii-Kosterlitz-Thouless theory based on Renormalization Group throughout the BCS-BEC crossover in 2D superconductors
Giovanni Midei, Koichiro Furutani, Luca Salasnich +1
Recent experiments on 2D superconductors allow the characterization of the critical temperature and of the phase diagram across the BCS-BEC crossover as a function of density. We o…
Fokker-Planck equations for a trapped particle in a quantum-thermal Ohmic bath: general theory and applications to Josephson junctions
Koichiro Furutani, Luca Salasnich
We consider a particle trapped by a generic external potential and under the influence of a quantum-thermal Ohmic bath. Starting from the Langevin equation, we derive the correspon…
First and second sound in two-dimensional bosonic and fermionic superfluids
L. Salasnich, A. Cappellaro, K. Furutani +2
We review our theoretical results about the sound propagation in two-dimensional (2D) systems of ultracold fermionic and bosonic atoms. In the superfluid phase, characterized by th…
Berezinskii-Kosterlitz-Thouless phase transition with Rabi-coupled bosons
Koichiro Furutani, Andrea Perali, Luca Salasnich
We theoretically investigate the superfluid-normal-state Berezinskii-Kosterlitz-Thouless transition in a binary mixture of bosonic atoms with Rabi coupling under balanced densities…
Quantum effective action for the bosonic Josephson junction
Koichiro Furutani, Jacques Tempere, Luca Salasnich
We investigate a bosonic Josephson junction by using the path-integral formalism with relative phase and population imbalance as dynamical variables. We derive an effective only-ph…
Superfluid properties of bright solitons in a ring
Koichiro Furutani, Luca Salasnich
We theoretically investigate superfluid properties of a one-dimensional annular superfluid with a boost. We derive the formula of the superfluid fraction in the one-dimensional sup…
Quantum and thermal fluctuations in the dynamics of a resistively and capacitively shunted Josephson junction
Koichiro Furutani, Luca Salasnich
We theoretically investigate the phase and voltage correlation dynamics, which includes both the deterministic contribution and stochastic fluctuations, under a current noise gener…
Dissipation and fluctuations in elongated bosonic Josephson junctions
F. Binanti, K. Furutani, L. Salasnich
We investigate the dynamics of bosonic atoms in elongated Josephson junctions. We find that these systems are characterized by an intrinsic coupling between the Josephson mode of m…
Sound modes in collisional superfluid Bose gases
Koichiro Furutani, Andrea Tononi, Luca Salasnich
We theoretically investigate sound modes in a weakly-interacting collisional Bose gas in dimensions. Using the Landau's two-fluid hydrodynamics and working within the Bogoliubo…