Impurity with a resonance in the vicinity of the Fermi energy
@article{Maslov2021ImpurityWA, title={Impurity with a resonance in the vicinity of the Fermi energy}, author={Mikhail M. Maslov and Mikhail Lemeshko and Artem G. Volosniev}, journal={Physical Review Research}, year={2021} }
We study an impurity with a resonance level whose position coincides with the Fermi energy of the surrounding Fermi gas. An impurity causes a rapid variation of the scattering phase shift for fermions at the Fermi surface, introducing a new characteristic length scale into the problem. We investigate manifestations of this length scale in the self-energy of the impurity and in the density of the bath. Our calculations reveal a model-independent deformation of the density of the Fermi gas, which…
References
SHOWING 1-10 OF 73 REFERENCES
Theory of a resonantly interacting impurity in a Bose-Einstein condensate
- Physics
- 2020
We investigate a Bose-Einstein condensate in strong interaction with a single impurity particle. While this situation has received considerable interest in recent years, the regime of strong coupling…
Observation of Fermi polarons in a tunable Fermi liquid of ultracold atoms.
- PhysicsPhysical review letters
- 2009
The polaron energy and the quasiparticle residue for various interaction strengths around a Feshbach resonance are determined and the transition from polaronic to molecular binding is observed at a critical interaction.
Theory of ultracold atomic Fermi gases
- Physics
- 2008
The physics of quantum degenerate atomic Fermi gases in uniform as well as in harmonically trapped configurations is reviewed from a theoretical perspective. Emphasis is given to the effect of…
Universal Aspects of a Strongly Interacting Impurity in a Dilute Bose Condensate.
- PhysicsPhysical review letters
- 2021
It is demonstrated 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 theImpurity- boson potential via a single parameter characterizing its range.
Impurity in a Fermi sea on a narrow Feshbach resonance: A variational study of the polaronic and dimeronic branches
- Physics
- 2012
We study the problem of a single impurity of mass $M$ immersed in a Fermi sea of particles of mass $m$. The impurity and the fermions interact through a s-wave narrow Feshbach resonance, so that the…
Dynamical Friedel oscillations of a Fermi sea
- Physics
- 2018
We study the scenario of quenching an interaction-free Fermi sea on a one-dimensional lattice ring by suddenly changing the potential of a site. From the point-of-view of the conventional Friedel…
Scattering of two heavy Fermi polarons: Resonances and quasibound states
- PhysicsPhysical Review A
- 2020
Impurities in a Fermi sea, or Fermi polarons, experience a Casimir interaction induced by quantum fluctuations of the medium. When there is short-range attraction between impurities and fermions,…
Friedel oscillations as a probe of fermionic quasiparticles
- Physics
- 2016
When immersed in a see of cold electrons, local impurities give rise to density modulations known as Friedel oscillations. In spite of the generality of this phenomenon, the exact shape of these…
Polaron residue and spatial structure in a Fermi gas
- Physics
- 2013
We consider a mobile impurity of mass M interacting via a s-wave broad or narrow Feshbach resonance with a Fermi sea of particles of mass m. Truncating the Hilbert space to at most one pair of…
Highly polarized Fermi gases across a narrow Feshbach resonance
- Physics
- 2012
We address the phase of a highly polarized Fermi gas across a narrow Feshbach resonance starting from the problem of a single down spin fermion immersed in a Fermi sea of up spins. Both polaron and…