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Bound states in two-dimensional Fermi systems with quadratic band touching

机译:具有二次频带触摸的二维FERMI系统中的绑定状态

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摘要

The formation of bound states between mobile impurity particles and fermionic atoms has been demonstrated in spin-polarized Fermi gases with attractive interspecies interaction. We investigate bound states of mobile impurities immersed in a two-dimensional system with a symmetry-protected quadratic band touching. In addition to the standard s-wave interaction, we consider an anisolropic dipolar exchange interaction that locally breaks point group symmetries. Using a weak-coupling renormalization group approach and a ladder approximation for the impurity-fermion propagator, we establish that the number of bound states can be controlled by varying the anisotropy of the exchange interaction. Our results show that the degeneracy and momentum dependence of the binding energies reflect some distinctive properties of the quadratic band touching.
机译:在具有吸引人的间隙相互作用的旋偏颗粒和Fermionic原子之间的形成在移动杂质颗粒和Fermionic原子之间的形成。我们调查浸入二维系统中的移动杂质的绑定状态,具有对称保护的二次带触摸。除了标准的S波相互作用之外,我们考虑了一种局部破坏点组对称的一种抗偏振偶极交换相互作用。使用弱耦合重整化组方法和杂质光纤传播者的梯形图,我们确定可以通过改变交换相互作用的各向异性来控制界定状态的数量。我们的研究结果表明,结合能的退化和动量依赖性反映了二次带触摸的一些独特性质。

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  • 来源
    《Physical review》 |2020年第15期|155120.1-155120.9|共9页
  • 作者单位

    Departamento de Fisica Universidade Federal de Minas Gerais Caixa Postal 702 Belo Horizonte Minas Gerais 30123-970 Brazil Universite Paris-Saclay CNRS Laboratoire de Physiques des Solides 91405 Orsay France;

    Instituto de Fisica de Sao Carlos Universidade de Sao Paulo Sao Carlos Sao Paulo 13560-970 Brazil;

    Departamento de Fisica Universidade Federal de Minas Gerais Caixa Postal 702 Belo Horizonte Minas Gerais 30123-970 Brazil Universite Paris-Saclay CNRS Laboratoire de Physiques des Solides 91405 Orsay France;

    International Institute of Physics and Departamento de Fisica Teorica e Experimental Universidade Federal do Rio Grande do Norte Natal Rio Grande do Norte 59078-970 Brazil;

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