Quantum Simulation with Ultra-Cold Bosons

Principal investigator
Introduction

Because of their high controllability, ultra-cold atoms offer a great platform to simulate certain problems arise from condense matter system. In our lab, a variety of cooling techniques are used to cool down Rubidium 87 to make Bose-Einstein Condensate. The BEC is then transferred into certain system of a specific Hamiltonian which is induced by Raman couplings, optical lattice, etc. We then use this as a simulation platform to study Gauge field and Spin-orbit coupling.
Our current research interest is topological phase transition and Exotic topological quantum states. There are intriguing topological phenomenon observed in condense matter system in recent years. Spin-orbit coupling is believed to be essential in understanding topological quantum states and a new class of topological materials. Thus, spin-orbit coupling system of the cold atoms has a great potential to study exotic quantum states and is promising to reveal physics beyond traditional condense matter system.

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  • Sun, W., Wang, B. -zong, Xu, X. -T., Yi, C. -R., Zhang, L., Wu, Z., Deng, Y., Liu, X. -jun, Chen, S. & Pan, J. -W. Highly Controllable and Robust 2D Spin-Orbit Coupling for Quantum Gases. Physical Review Letters 121, 150401 (2018).
  • Long, J. -B., Yang, S. -J., Chen, S. & Pan, J. -W. Magnetic-enhanced modulation transfer spectroscopy and laser locking for 87 Rb repump transition. Optics Express 26, 27773 (2018).
  • Xu, X. -T., Yi, C. -R., Wang, B. -zong, Sun, W., Deng, Y., Liu, X. -jun, Chen, S. & Pan, J. -W. Precision mapping the topological bands of 2D spin-orbit coupling with microwave spin-injection spectroscopy. Science Bulletin 63, 1464-1469 (2018).
  • Sun, W., Yi, C. -R., Wang, B. -zong, Zhang, W. -W., Sanders, B., Xu, X. -T., Wang, Z. -Y., Schmiedmayer, J., Deng, Y., Liu, X. -jun, Chen, S. & Pan, J. -W. Uncover Topology by Quantum Quench Dynamics. Physical Review Letters 121, 250403 (2018).
  • Wu, Z., Zhang, L., Sun, W., Xu, X. -T., Wang, B. -Z., Ji, S. -C., Deng, Y., Chen, S., Liu, X. -J. & Pan, J. -W. Realization of two-dimensional spin-orbit coupling for Bose-Einstein condensates. Science 354, 83-88 (2016).
  • Ji, S. -C., Zhang, L., Xu, X. -T., Wu, Z., Deng, Y., Chen, S. & Pan, J. -W. Softening of Roton and Phonon Modes in a Bose-Einstein Condensate with Spin-Orbit Coupling. Physical Review Letters 114, 105301 (2015).
  • Ji, S. -C., Zhang, J. -Y., Zhang, L., Du, Z. -D., Zheng, W., Deng, Y., Zhai, H., Chen, S. & Pan, J. -W. Experimental determination of the finite-temperature phase diagram of a spin-orbit coupled Bose gas. Nature Physics 10, 314-320 (2014).
  • Zhang, L., Zhang, J. -Y., Ji, S. -C., Du, Z. -D., Zhai, H., Deng, Y., Chen, S., Zhang, P. & Pan, J. -W. Stability of excited dressed states with spin-orbit coupling. Physical Review A 87, 011601 (2013).
  • Zhang, J. -Y., Ji, S. -C., Chen, Z., Zhang, L., Du, Z. -D., Yan, B., Pan, G. -S., Zhao, B., Deng, Y., Zhai, H., Chen, S. & Pan, J. -W. Collective Dipole Oscillations of a Spin-Orbit Coupled Bose-Einstein Condensate. Physical Review Letters 109, 115301 (2012).