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In this talk, I will present a superfluid with supersolidlike properties, i.e., angular stripe phase, realized in a pancakelike spin-1/2 Bose gas with spin-orbital-angular-momentum coupling. A rich ground-state phase diagram, including the vortex-antivortex pair phase, the half-skyrmion phase, and two different angular stripe phases, will be depicted. The stripe phases feature a modulated angular density-density correlation with a sizable contrast and can occupy a relatively large parameter space. The low-lying collective excitations, such as the dipole and breathing modes, show distinct behaviors in different phases. The existence of the stripe phase is also clearly indicated in the energetic and dynamic instabilities of collective modes near phase transitions. Our predictions of the angular stripe phase could be readily examined in current cold-atom experiments with Rb87 and K41.
Xiao-Long Chen, got the bachelor diploma at East China Normal University (China) in 2011 and a master's degree from Trento University and the International Institute for Advanced Study (SISSA, Italy) in 2014. He graduated with a Ph.D. in Science from Swinburne University of Technology (Australia) in 2018. Since 2019, he is a postdoctoral fellow at the Institute for Advanced Study of Tsinghua University. The main researches are focused on one-dimensional Bose and Fermi gases, artificial gauge field and quasicrystals.