Optical response of the supersolid polaron

Abstract

The ground-state properties of the supersolid polaron consisting of a neutral impurity immersed in a dipolar supersolid have recently been studied. Here, the optical response of an impurity in a dipolar supersolid is calculated and interpreted in terms of the contributions of the different excitation modes of the supersolid. The optical absorption spectrum reveals the two Van Hove singularities that correspond to the flattening of the two Goldstone modes of the supersolid at the Brillouin zone edge. A single peak is found in the superfluid regime corresponding to the roton minimum which diverges at the transition. We propose the response of an ionic impurity as an experimental probe for the supersolid excitations and show how this technique can be extended to neutral impurities with an electric or magnetic dipole moment.

6 pages, 4 figures. Published in Physical Review Research

References in corpus (18)

• Many-Body Physics with Ultracold Gases
• Observation of the supersolid stripe phase in spin-orbit coupled Bose-Einstein condensates
• Transient supersolid properties in an array of dipolar quantum droplets
• Long-lived and transient supersolid behaviors in dipolar quantum gases
• Rotation of quantum impurities in the presence of a many-body environment
• Mean-field expansion in Bose-Einstein condensates with finite-range interactions
• Diagrammatic Monte Carlo study of the acoustic and the BEC polaron
• Finite-temperature behavior of the Bose polaron
• Sub-unity superfluid fraction of a supersolid from self-induced Josephson effect
• Many-body bound states and induced interactions of charged impurities in a bosonic bath
• Life and death of the Bose polaron
• Sound, superfluidity and layer compressibility in a ring dipolar supersolid
• Ground-state stability and excitation spectrum of a one-dimensional dipolar supersolid
• Decoupled sound and amplitude modes in trapped dipolar supersolids
• Modified mean field ansatz for charged polarons in a Bose-Einstein condensate
• Supersolid spectroscopy
• General memory kernels and further corrections to the variational path integral approach for the Bogoliubov-Fröhlich Hamiltonian
• Optical conductivity of an anharmonic large polaron gas at weak coupling