Massignan Pietro, Yegovtsev Nikolay, Gurarie Victor
Departament de Física, Universitat Politècnica de Catalunya, Campus Nord B4-B5, E-08034 Barcelona, Spain.
Department of Physics and Center for Theory of Quantum Matter, University of Colorado, Boulder, Colorado 80309, USA.
Phys Rev Lett. 2021 Mar 26;126(12):123403. doi: 10.1103/PhysRevLett.126.123403.
We study the properties of an impurity immersed in a weakly interacting Bose gas, i.e., of a Bose polaron. In the perturbatively tractable limit of weak impurity-boson interactions many of its properties are known to depend only on the scattering length. Here we demonstrate that for strong (unitary) impurity-boson interactions all quasiparticle properties of a heavy Bose polaron, such as its energy, its residue, its Tan's contact, and the number of bosons trapped nearby the impurity, depend on the impurity-boson potential via a single parameter characterizing its range.
我们研究了浸没在弱相互作用玻色气体中的杂质的性质，即玻色极化子的性质。在杂质 - 玻色子相互作用较弱且易于微扰处理的极限情况下，已知其许多性质仅取决于散射长度。在此我们证明，对于强（幺正）杂质 - 玻色子相互作用，重玻色极化子的所有准粒子性质，如能量、留数、谭接触以及被困在杂质附近的玻色子数量，都通过一个表征其范围的单一参数依赖于杂质 - 玻色子势。
