Welcome to Xiaoquan’s research group !

Research interests

The main research interests focus on out of equilibrium processes in quantum fluids driven by topological defects, including collective dynamics of quanutm vortices, quantum turbulence, and dynamics of magnetic domain walls. Another area of research is statistical mechanics of quantum systems in the presence of disorder, examples are Anderson localization and quantum spin glasses.

Want to know more ? Check out these papers ! Turbulence; Quantum Turbulence; Spin Glasses

Short CV

I am an assistant professor at Graduate School of China Academy of Engineering Physics (GSCAEP). I obtained my PhD in theoretical physics in 2012 from SISSA. From 2013-2015 I conducted postdoctoral research at New Zealand institute for advanced study. I started to work at the physics department of the University of Otago as a research fellow in 2015, where my research focus on quantum fluids, vortex dynamcis and turbulence. In 2019 I joined GSCAEP.

Group members

Postdoc : Dr. Chen Ma (马晨)

PhD students： Yixiu Bai (白伊秀), Jiangnan BiGuo (毕郭江南), Rui Han (韩锐)

Master’s students：Jiawen Chen (陈嘉文)

Alumni

Lei Qiao (乔雷) Postdoc (博强计划 2020.7-2020.12) -> Postdoc at National University of singapore

Yanqi Xiong (熊彦淇) PhD (2020.7-2023.7) -> Lecturer at Hunan institute of science and technology

Oppotunities

Would you like to do a Master, Ph.D or postdoc at GSCAEP, Beijing ? Please feel free to contact me (email address: xqyu@gscaep.ac.cn or xiaoquan.yu@otago.ac.nz). Welcome to join us !

Publications

Preprints

1) Jun Nian, Xiaoquan Yu, Jinwu Ye, A Non-Unitary Conformal Field Theory Approach to Two-Dimensional Turbulence, arxiv

2) Jiawen Chen, Xiaoquan Yu, Onsager vortex clusters on a sphere, arxiv

3) Xiaoquan Yu, P. B. Blakie, Absence of breakdown of ferrodark solitons exhibiting snake instability, arxiv

Solitons in Fermi gases

1) Antonio Muñoz Mateo, Xiaoquan Yu, Two types of dark solitons in a spin-orbit-coupled Fermi gas, Phys. Rev. A (Letter) 105, L021301, (2022)

Ferrodark solitons in spin-1 ferromagnetic superfluids

3) Xiaoquan Yu and P. B. Blakie, Core structure of static ferrodark solitons in a spin-1 Bose-Einstein condensate, Phys. Rev. Research 4, 033056, (2022)

2) Xiaoquan Yu and P. B. Blakie, Propagating Ferrodark Solitons in a Superfluid: Exact Solutions and Anomalous Dynamics, Phys. Rev. Lett. 128, 125301,(2022)

1) Xiaoquan Yu and P.B. Blakie, Dark soliton-like magnetic domain walls in a two-dimensional ferromagnetic superfluid, Phys. Rev. Research 3, 023043,(2021)

Quantum vortices in superfluids and BKT transitions

13) Andrew P. C. Underwood, Andrew J. Groszek, Xiaoquan Yu, P. B. Blakie, L. A. Williamson, Berezinskii-Kosterlitz-Thouless transitions in a ferromagnetic superfluid: effects of axial magnetization, Phys. Rev. A 110, 013311,(2024)

12) Yanqi Xiong and Xiaoquan Yu, Hydrodynamics of quantum vortices on a closed surface, Phys. Rev. Research 6, 013133,(2024)

11) Yanqi Xiong, Jiawen Chen and Xiaoquan Yu, Axis-symmetric Onsager Clustered States of Point Vortices in a Bounded Domain，Commun. Theor. Phys. 75 095101,(2023)

10) Andrew P. C. Underwood, Andrew J. Groszek, Xiaoquan Yu, P. B. Blakie, L. A. Williamson, Berezinskii-Kosterlitz-Thouless transitions in an easy-plane ferromagnetic superfluid, Phys. Rev. Research (Letter) 5, L012045,(2023)

9) Ashton S. Bradley, R. Kishor Kumar, Sukla Pal, Xiaoquan Yu, Spectral analysis for compressible quantum fluids, Phys. Rev. A 106, 043322,(2022)

8) Matthew T Reeves, Kwan Goddard-Lee, Guillaume Gauthier, Oliver R Stockdale, Hayder Salman, Timothy Edmonds, Xiaoquan Yu, Ashton S Bradley, Mark Baker, Halina Rubinsztein-Dunlop, Matthew J Davis, Tyler W Neely ,Turbulent Relaxation to Equilibrium in a Two-Dimensional Quantum Vortex Gas, Phys. Rev. X 12, 011031, (2022).

7) Oliver R. Stockdale, Matthew T. Reeves, Xiaoquan Yu, Guillaume Gauthier, Kwan Goddard-Lee, Warwick P. Bowen, Tyler W. Neely, and Matthew J. Davis, Universal dynamics in the expansion of vortex clusters in a dissipative two-dimensional superfluid, Phys. Rev. Research 2, 033138,(2020).

6) G. Gauthier, M. Reeves, X. Yu, A. S. Bradley, M. Baker, Thomas A. Bell, H.R-Dunlop, M. J. Davis,T. Neely, Giant vortex clusters in a two-dimensional quantum fluid, Science 364 (6447), (2019).

5) M. M. Cawte, X. Yu, B. P. Anderson, A. S. Bradley,Snell’s Law for a vortex dipole in a Bose-Einstein condensate (Editor’s Selection), SciPost Phys. 6, 032 (2019).

4) X. Yu and A. S. Bradley, Emergent Non-Eulerian Hydrodynamics of Quantum Vortices in Two Dimensions, Phys. Rev. Lett. 119, 185301 (2017).

3) M. T. Reeves, T. P. Billam, X. Yu, and A. S. Bradley, Enstrophy Cascade in Decaying Two-Dimensional Quantum Turbulence, Phys. Rev. Lett. 119, 184502 (2017).

2) X. Yu, T. P. Billam, J. Nian, M. T. Reeves, and A. S. Bradley, Theory of the vortex-clustering transition in a confined two-dimensional quantum fluid, Phys. Rev. A , 94, 023602 (2016).

1) A. M. Mateo, X. Yu, and J. Nian, Vortex lines attached to dark solitons in Bose-Einstein condensates and boson-vortex duality in 3+1 dimensions, Phys. Rev. A , 94, 063623 (2016).

Quantum disordered systems

5) Yagmur Kati, Xiaoquan Yu, Sergej Flach, Density resolved wave packet spreading in disordered Gross-Pitaevskii lattices, SciPostPhysCore.3.2.006 (2020).

4) J. D. Bodyfelt, D. Leykam, C. Danieli, X. Yu, and S. Flach, Flat Bands under Correlated Perturbations, Phys. Rev. Lett. 113, 236403 (2014).

3) X. Yu and S. Flach, Enhancement of chaotic subdiffusion in disordered ladders with synthetic gauge fields, Phys. Rev. E, 90, 032910 (2014).

2) X. Yu and M. Mueller, Localization of disordered bosons and magnets in random fields, Ann. Phys. 337, 55 (2013).

1) X. Yu and M. Mueller, Mean field theory of superglasses, Phys. Rev. B 85, 104205 (2012).

Population dynamics

1) X. Yu, Xiangyi Li, Applications of WKB and Fokker-Planck methods in analyzing population extinction driven by weak demographic fuctuations, Bull Math Biol (2018).