Properties of One-Dimensional Highly Polarized Fermi Gases  

作　　者：Ya-Dong Song Xiao-Ming Cai 宋亚东;蔡小明(State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences;School of Physical Sciences, University of Chinese Academy of Sciences)

机构地区：[1]State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics,Wuhan Inst,itute of Physics and Mathematics,Chinese Academy of Sciences,Wuhan 430071 [2]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049

出　　处：《Chinese Physics Letters》2018年第11期6-10,共5页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 11374331,11304364 and 11534014

摘　　要：Using both the exact Bethe ansatz method and the variational method, we study properties of the one-dimensional Fermi polaron. We focus on the binding energy, effective mass, momentum distributions, Tan contact and correlation functions. As the attraction increases, the impurity is more tightly bound and correlated with the surrounding particles, and the size of formed polaron decreases. In addition, compared with the Bethe ansatz method, the variational method is totally qualified to study the one-dimensional Fermi polaron. The intrinsic reason is that the number of particle-hole excitations in a Fermi sea, caused by a single impurity, is always rather small. The variational method can be well extended to other impurity systems.Using both the exact Bethe ansatz method and the variational method, we study properties of the one-dimensional Fermi polaron. We focus on the binding energy, effective mass, momentum distributions, Tan contact and correlation functions. As the attraction increases, the impurity is more tightly bound and correlated with the surrounding particles, and the size of formed polaron decreases. In addition, compared with the Bethe ansatz method, the variational method is totally qualified to study the one-dimensional Fermi polaron. The intrinsic reason is that the number of particle-hole excitations in a Fermi sea, caused by a single impurity, is always rather small. The variational method can be well extended to other impurity systems.

关 键 词：Properties of One-Dimensional Highly Polarized Fermi Gases AS 

分 类 号：O562[理学—原子与分子物理]