# Staff Profile

I am I-Kang Liu, also known as Gary Liu. In October 2019, I joined Newcastle University as a research associate to work on the dynamics of ultra-cold Bose gases with Prof. Nick Proukakis.

Before this, in 2016 I obtained my Ph. D degree in Physics at National Changhua University of Education, Taiwan with Prof. Shih-Chuan Gou, who leads the Ultra-Cold Atom Theory (UCAT) group, and then continued as a postdoctoral researcher alongside my three-year alternative national service, finished in 2019.

My research interests are Bose-Einstein condensates, topological defects and non-equilibrium dynamics. I am also interested in topological properties of quantum systems. I have been implementing a classical-field theory to study the dynamics of BEC at finite temperatures with collaboration with experimentalists. I also theoretically investigate novel systems/structures in a variety of ultracold Bose gas systems.

My research interests are Bose-Einstein condensate, topological defects inside that and topology of quantum systems. I have been implementing a classical-field theory to study the dynamics of BEC at finite temperatures with collaboration with experimentalists. I also theoretically investigate novel systems/structures in a variety of ultracold Bose gas systems.

Recently we are studying how ultracold Bose gas re-equilibrates across a phase transition via quenches and corresponding scaling behaviours around the critical point.

I am also interested in multi-component condensate with extra-degree of freedom and system-dependent symmetries, yielding different type of defects, such as skyrmion, half-quantized vortices in spinor condensate systems.

**My Google Scholar**

https://scholar.google.com.tw/citations?user=m3j3D6oAAAAJ&hl=zh-TW

- Liu I-K, Dziarmaga J, Gou S-C, Dalfovo F, Proukakis NP. Kibble-Zurek dynamics in a trapped ultracold Bose gas.
*Physical Review Research*2020,**2**(3), 033183. - Liu IK, Gou SC, Takeuchi H. Phase Diagram of Solitons in the Polar Phase of a Spin-1 Bose-Einstein Condensate.
*Physical Review Research*2020,**2**(3), 033506. - Liu IK, Donadello S, Lamporesi G, Ferrari G, Gou SC, Dalfovo F, Proukakis NP. Dynamical Equilibration Across a Quenched Phase Transition in a Trapped Quantum Gas.
*Communications Physics*2018,**1**, 24. - Su SW, Liu IK, Gou SG, Liao R, Fialko O, Brand J. Hidden long-range order in a spin-orbit-coupled two-dimensional Bose gas.
*Physical Review A*2017,**95**, 053629. - Lee KL, Jørgensen NB, Liu I-K, Wacker L, Arlt JJ, Proukakis NP. Phase separation and dynamics of two-component Bose-Einstein condensates.
*Physical Review A*2016,**94**(1), 013602. - Liu IK, Pattinson RW, Billam TP, Gardiner SA, Cornish SL, Huang TM, Lin WW, Gou SC, Parker NG, Proukakis NP. Stochastic Growth Dynamics and Composite Defects in Quenched Immiscible Binary Condensates.
*Physical Review A*2016,**93**, 023628. - You JS, Liu IK, Wang DW, Gou SC, Wu C. Unconventional Bose-Einstein condensation in a system with two species of bosons in the p-orbital bands in an optical lattice.
*Physical Review A*2016,**93**, 053623. - Su SW, Gou SC, Liu IK, Bradley A, Fialko O, Brand J. Oscillons in coupled Bose-Einstein condensates.
*Physical Review A*2015,**91**, 023631. - Su SW, Gou SC, Liu IK, Spielman IB, Santos L, Acus A, Mekys A, Ruseckas J, Juzeliunas G. Position-dependent spin-orbit coupling for ultracold atoms.
*New Journal of Physics*2015,**17**, 033045. - Su SW, Liu IK, Tsai YC, Liu WM, Gou SC. Crystallized half-skyrmions and inverted half-skyrmions in the condensation of spin-1 Bose gases with spin-orbit coupling.
*Physical Review A*2012,**86**, 023601. - Su SW, Hsueh CH, Liu IK, Horng TL, Tsai YC, Gou SC, Liu WM. Spontaneous crystallization of skyrmions and fractional vortices in fast-rotating and rapidly quenched spin-1 Bose-Einstein condensates.
*Physical Review A*2011,**84**, 023601.