Staff Profile

I am Gary (I-Kang) Liu a postdoctoral researcher in theoretical physics. I am interested in superfluid systems in diverse setups, from microscopic atomic gaseous systems to astrophysical size and even to cosmological scales. I specifically work on the bosonic cases in which Bose-Einstein condensation (BEC) can occur and their exotic properties via numerical simulations and analytical approaches. I am also interested in the 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.

Now I am a research associate working with Dr Toby Woods, Dr Andrew Baggaley and Prof Carlo Barenghi to model neutron star interios on their superfluid components via a set of Ginzburg-Landau equations of motion and relevant observational evidences for glitches and corresponding effective models.

From 2020-2023, I joined the cosmological group as a Marie-Cuire fellow working with Dr Gerasimos Rigopoulos and Prof. Nick Proukakis to study a hypothetical ultralight dark matter candidate forming the de Broglie matter wave in cosmological length scale, called fuzzy dark matter (FDM) or BECDM. The quantum wavy feature turns out to be dominant and the equation of motion of it is modelled by a scale wavefunction. Such macroscopic wavefunction plays a crucial role in the structures of galactic halos and may provide possible solutions to the challenges in the great success cold dark matter model. We have brought an exciting publication on the halo structure in which the granule sizes are determined by the inter-vortex distance with a chaotically turbulent state.

In 2019 I joined Prof. Nick Proukakis' group to investigate the quench dynamics in which topological defects can spontaneously form when the system passes through the condensation phase transition

During my PhD in at National Changhua University of Education, Taiwan, I studied the non-equilibrium dynamics at finite temperatures and for atomic Bose-Einstein condensates (BECs) and the exotic phase of BECs when atoms are pumped into the excited states of a lattice system. .

My Google Scholar

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

Mini-Workshop: Introduction to Git/GitHub (1 March 2024, together with Dr Thomas Billiam and Dr Nick Keepfer)

Quantum fluids MAS8812/PHY8042 - Waves and Soltions and Multi-competent Condensates (2023)

Quantum Physics PHY2020 - Problem-solving class (2022)

• Articles

  • Kuan Y-H, Lee S-Y, Shao S-W, Chiang W-C, Liu I-K, Ruseckas J, Juzeliunas G, Lin Y-J, Liao W-T. Synthetic Landau levels and robust chiral edge states for dark-state polaritons in a static and scalable continuum media. Physical Review Research 2023, 5(4), L042029.
  • Liu IK, Proukakis NP, Rigopoulos G. Coherent and incoherent structures in fuzzy dakr matter haloes. Monthly Notices of the Royal Astronomical Society 2023, 521(3), 3625–3647.
  • Wilson KE, Guttridge A, Liu I-Kang, Segal J, Billam TP, Parker NG, Proukakis NP, Cornish SL. Dynamics of a degenerate Cs-Yb mixture with attractive interspecies interactions. Physical Review Research 2021, 3(3), 033096.
  • 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 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, 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.
  • 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.
  • 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.
  • 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.
  • 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, Gou SC, Liu IK, Bradley A, Fialko O, Brand J. Oscillons in coupled Bose-Einstein condensates. Physical Review A 2015, 91, 023631.
  • 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.