First and second sound in a dilute Bose gas across the BKT transition
- URL: http://arxiv.org/abs/2203.08837v1
- Date: Wed, 16 Mar 2022 18:00:02 GMT
- Title: First and second sound in a dilute Bose gas across the BKT transition
- Authors: Vijay Pal Singh and Ludwig Mathey
- Abstract summary: We study the propagation of the two sound modes in two-dimensional Bose gases across the Berezinksii-Kosterlitz-Thouless transition.
Based on the dynamic structure factor, we identify the two sound modes as the Bogoliubov (B) and the non-Bogoliubov (NB) sound mode.
- Score: 0.0
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We study the propagation of the two sound modes in two-dimensional Bose gases
across the Berezinksii-Kosterlitz-Thouless (BKT) transition using
classical-field dynamics, which is motivated by recent measurements of
Christodoulou et al. Nature 594, 191 (2021). Based on the dynamic structure
factor, we identify the two sound modes as the Bogoliubov (B) and the
non-Bogoliubov (NB) sound mode below the transition, and as the diffusive and
the normal sound mode above the transition. The NB sound mode velocity is
higher than the B sound mode velocity, which we refer to as the weak-coupling
regime of the sound modes. We excite the sound modes by driving the system as
in the experiment and by perturbing the density with a step-pulse perturbation,
as a secondary comparison. The driven response depends on the driving strength
and results in higher velocities for the B sound mode at high temperatures near
the transition, compared to the sound results of the dynamic structure factor
and step-pulse excitation. We show that the higher mode velocity has a weak
temperature dependence across the transition, which is consistent with the
experimental observation.
Related papers
- Decoupled sound and amplitude modes in trapped dipolar supersolids [0.0]
We show how decoupled first sound, second sound, and Higgs modes emerge by following their origin from superfluid modes across the transition.
Our results unify previous notions of coupled Goldstone and Higgs modes in harmonic traps.
arXiv Detail & Related papers (2024-04-18T17:59:41Z) - Autonomous coherence protection of a two-level system in a fluctuating
environment [68.8204255655161]
We re-examine a scheme originally intended to remove the effects of static Doppler broadening from an ensemble of non-interacting two-level systems (qubits)
We demonstrate that this scheme is far more powerful and can also protect a single (or even an ensemble) qubit's energy levels from noise which depends on both time and space.
arXiv Detail & Related papers (2023-02-08T01:44:30Z) - Driven-dissipative topological phases in parametric resonator arrays [62.997667081978825]
We find two phases of topological amplification, both with directional transport and exponential gain with the number of sites, and one of them featuring squeezing.
We characterize the resilience to disorder of the different phases and their stability, gain, and noise-to-signal ratio.
We discuss their experimental implementation with state-of-the-art techniques.
arXiv Detail & Related papers (2022-07-27T18:00:05Z) - Stabilizing and improving qubit coherence by engineering noise spectrum
of two-level systems [52.77024349608834]
Superconducting circuits are a leading platform for quantum computing.
Charge fluctuators inside amorphous oxide layers contribute to both low-frequency $1/f$ charge noise and high-frequency dielectric loss.
We propose to mitigate those harmful effects by engineering the relevant TLS noise spectral densities.
arXiv Detail & Related papers (2022-06-21T18:37:38Z) - Photoinduced prethermal order parameter dynamics in the two-dimensional
large-$N$ Hubbard-Heisenberg model [77.34726150561087]
We study the microscopic dynamics of competing ordered phases in a two-dimensional correlated electron model.
We simulate the light-induced transition between two competing phases.
arXiv Detail & Related papers (2022-05-13T13:13:31Z) - Dynamics of mode entanglement induced by particle-tunneling in the
extended Bose-Hubbard dimer model [0.0]
The evolution of mode entanglement is analysed for a system of two indistinguishable bosons with two accessible modes.
Our results provide guidance for the design and control of specific dynamics of mode entanglement.
arXiv Detail & Related papers (2021-12-23T06:37:28Z) - Stabilization of Qubit Relaxation Rates by Frequency Modulation [68.8204255655161]
Temporal, spectral, and sample-to-sample fluctuations in coherence properties of qubits form an outstanding challenge for the development of upscaled fault-tolerant quantum computers.
A ubiquitous source for these fluctuations in superconducting qubits is a set of atomic-scale defects with a two-level structure.
We show that frequency modulation of a qubit or, alternatively, of the two-level defects, leads to averaging of the qubit relaxation rate over a wide interval of frequencies.
arXiv Detail & Related papers (2021-04-08T11:32:03Z) - Collective modes and superfluidity of a two-dimensional ultracold Bose
gas [0.0]
We present how a two-dimensional Bose gas responds to a moving lattice potential.
In particular we discuss how the induced heating rate depends on the interaction strength and the temperature.
This gives a novel insight into the two regimes of Bose gases, defined via the hierarchy of sounds modes.
arXiv Detail & Related papers (2020-09-30T18:00:01Z) - BEC immersed in a Fermi sea: Theory of static and dynamic behavior
across phase separation [1.7990829163162367]
We study the static and dynamic behavior of a BEC immersed in a large Fermi sea of ultracold atoms under conditions of tunable interspecies interaction.
We develop mean-field models to simulate the system over a wide range of repulsion strength.
We show that the mediated interaction between bosons induced by the Fermi sea can be understood as an adiabatic second-order mean-field effect.
arXiv Detail & Related papers (2020-04-17T15:03:27Z) - Current Oscillations in Quasi-2D Charge-Density-Wave 1T-TaS2 Devices:
Revisiting the "Narrow Band Noise" Concept [58.720142291102135]
We report on current oscillations in quasi two-dimensional (2D) 1T-TaS2 charge-density-wave devices.
The MHz-frequency range of the oscillations and the linear dependence of the frequency of the oscillations on the current resemble the "narrow band noise"
Analysis of the biasing conditions and current indicate that the observed oscillations are related to the current instabilities due to the voltage-induced transition from the nearly commensurate to incommensurate charge-density-wave phase.
arXiv Detail & Related papers (2020-02-29T22:45:46Z) - Sound propagation in a two-dimensional Bose gas across the superfluid
transition [0.0]
We study sound propagation in a two-dimensional (2D) Bose gas across the superfluid-thermal transition using classical field dynamics.
As a key observation, we discuss the weak coupling regime in which the non-Bogoliubov mode has a higher velocity than the Bogoliubov mode.
arXiv Detail & Related papers (2020-02-05T19:00:01Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.