233 citations · 656 across the 19 of their papers we have counts for
19 papers
Turbulence in Quantum Gases: Vortices, Waves, and Cascades
Ashton S. Bradley, Tyler W. Neely, Xiaoquan Yu +1
We review turbulence in ultracold quantum gases, using the scalar contact-interaction Bose-Einstein condensate as the reference system for quantized circulation, compressibility, v…
Axis-symmetric Onsager Clustered States of Point Vortices in a Bounded Domain
Yanqi Xiong, Jiawen Chen, Xiaoquan Yu
We study axis-symmetric Onsager clustered states of a neutral point vortex system confined to a two-dimensional disc. Our analysis is based on the mean field of bounded point vorti…
Berezinskii-Kosterlitz-Thouless transitions in an easy-plane ferromagnetic superfluid
Andrew P. C. Underwood, Andrew J. Groszek, Xiaoquan Yu +2
A two-dimensional (2D) spin-1 Bose gas exhibits two Berezenskii-Kosterlitz-Thouless (BKT) transitions in the easy-plane ferromagnetic phase. The higher temperature transition is as…
Spectral analysis for compressible quantum fluids
Ashton S. Bradley, R. Kishor Kumar, Sukla Pal +1
Turbulent fluid dynamics typically involves excitations on many different length scales. Classical incompressible fluids can be cleanly represented in Fourier space enabling spectr…
Two types of dark solitons in a spin-orbit-coupled Fermi gas
Antonio Muñoz Mateo, Xiaoquan Yu
Dark solitons in quantum fluids are well known nonlinear excitations that are usually characterized by a single length scale associated with the underlying background fluid. We sho…
Turbulent relaxation to equilibrium in a two-dimensional quantum vortex gas
Matthew T. Reeves, Kwan Goddard-Lee, Guillaume Gauthier +9
We experimentally study emergence of microcanonical equilibrium states in the turbulent relaxation dynamics of a two-dimensional chiral vortex gas. Same-sign vortices are injected…
Dark soliton-like magnetic domain walls in a two-dimensional ferromagnetic superfluid
Xiaoquan Yu, P. B. Blakie
We report a stable magnetic domain wall in a uniform ferromagnetic spin-1 condensate, characterized by the magnetization having a dark soliton profile with nonvanishing superfluid…
Density Resolved Wave Packet Spreading in Disordered Gross-Pitaevskii Lattices
Yagmur Kati, Xiaoquan Yu, Sergej Flach
We perform novel energy and norm density resolved wave packet spreading studies in the disordered Gross-Pitaevskii (GP) lattice to confine energy density fluctuations. We map the l…
Snell's Law for a vortex dipole in a Bose-Einstein condensate
Michael M. Cawte, Xiaoquan Yu, Brian P. Anderson +1
A quantum vortex dipole, comprised of a closely bound pair of vortices of equal strength with opposite circulation, is a spatially localized travelling excitation of a planar super…
Giant Vortex Clusters in a Two-Dimensional Quantum Fluid
Guillaume Gauthier, Matthew T. Reeves, Xiaoquan Yu +6
Adding energy to a system through transient stirring usually leads to more disorder. In contrast, point-like vortices in a bounded two-dimensional fluid are predicted to reorder ab…
Applications of WKB and Fokker-Planck methods in analyzing population extinction driven by weak demographic fluctuations
Xiaoquan Yu, Xiang-Yi Li
In large but finite populations, weak demographic stochasticity due to random birth and death events can lead to population extinction. The process is analogous to the escaping pro…
Emergent Non-Eulerian Hydrodynamics of Quantum Vortices in Two Dimensions
Xiaoquan Yu, Ashton S. Bradley
We develop a coarse-grained description of the point-vortex model, finding that a large number of planar vortices and antivortices behave as an inviscid non-Eulerian fluid at large…
Enstrophy Cascade in Decaying Two-Dimensional Quantum Turbulence
M. T. Reeves, T. P. Billam, X. Yu +1
We report evidence for an enstrophy cascade in large-scale point-vortex simulations of decaying two-dimensional quantum turbulence. Devising a method to generate quantum vortex con…
Vortex lines attached to dark solitons in Bose-Einstein condensates and Boson-Vortex Duality in 3+1 Dimensions
A. Muñoz Mateo, Xiaoquan Yu, Jun Nian
We demonstrate the existence of stationary states composed of vortex lines attached to planar dark solitons in scalar Bose-Einstein condensates. Dynamically stable states of this t…
Theory of the vortex-clustering transition in a confined two-dimensional quantum fluid
Xiaoquan Yu, Thomas P. Billam, Jun Nian +2
Clustering of like-sign vortices in a planar bounded domain is known to occur at negative temperature, a phenomenon that Onsager demonstrated to be a consequence of bounded phase s…
Flat Bands Under Correlated Perturbations
Joshua D. Bodyfelt, Daniel Leykam, Carlo Danieli +2
Flat band networks are characterized by coexistence of dispersive and flat bands. Flat bands (FB) are generated by compact localized eigenstates (CLS) with local network symmetries…
Enhancement of chaotic subdiffusion in disordered ladders with synthetic gauge fields
Xiaoquan Yu, Sergej Flach
We study spreading wave packets in a disordered nonlinear ladder with broken time-reversal symmetry induced by synthetic gauge fields. The model describes the dynamics of interacti…
Localization of disordered bosons and magnets in random fields
Xiaoquan Yu, Markus Mueller
We study localization properties of disordered bosons and spins in random fields at zero temperature. We focus on two representatives of different symmetry classes, hard-core boson…
Mean field theory of superglasses
Xiaoquan Yu, Markus Mueller
We study the interplay of superfluidity and glassy ordering of hard core bosons with random, frustrating interactions. This is motivated by bosonic systems such as amorphous supers…