Jiang Yuzhu, Qi Ran, Shi Zhe-Yu, Zhai Hui
State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China.
Department of Physics, Renmin University of China, Beijing, 100872, China.
Phys Rev Lett. 2017 Feb 24;118(8):080403. doi: 10.1103/PhysRevLett.118.080403.
In this Letter we show that the vortex lattice structure in the Bose-Fermi superfluid mixture can undergo a sequence of structure transitions when the Fermi superfluid is tuned from the BCS regime to the BEC regime. This is due to the difference in the vortex core structure of a Fermi superfluid in the BCS regime and in the BEC regime. In the BCS regime the vortex core is nearly filled, while the density at the vortex core gradually decreases until it empties out in the BEC regime. Therefore, with the density-density interaction between the Bose and the Fermi superfluids, interaction between the two sets of vortex lattices gets stronger in the BEC regime, which yields the structure transition of vortex lattices. In view of the recent realization of this superfluid mixture and vortices therein, our theoretical predication can be verified experimentally in the near future.
在本信函中，我们表明，当费米超流体从BCS态调谐至BEC态时，玻色-费米超流体混合物中的涡旋晶格结构会经历一系列结构转变。这是由于BCS态和BEC态下费米超流体的涡旋核心结构存在差异。在BCS态下，涡旋核心几乎被填满，而在BEC态下，涡旋核心处的密度逐渐降低直至排空。因此，由于玻色超流体与费米超流体之间的密度-密度相互作用，两组涡旋晶格之间的相互作用在BEC态下变得更强，从而导致涡旋晶格的结构转变。鉴于这种超流体混合物及其内部涡旋最近已被实现，我们的理论预测在不久的将来可通过实验得到验证。
