Density and pseudo-spin rotons in a bilayer of soft-core bosons

Abstract

We study the dynamics of a bilayer system of bosons with repulsive soft-core Rydberg-dressed interactions within the mean-field Bogoliubov-de Gennes approximation. We find roton minima in both symmetric and asymmetric collective density modes of the symmetric bilayer. Depending on the density of bosons in each layer and the spacing between two layers, the homogeneous superfluid phase becomes unstable in either (or both) of these two channels, leading to density and pseudo-spin-density wave instabilities in the system. Breaking the symmetry between two layers, either with a finite counterflow or a density imbalance renormalizes the dispersion of collective modes and makes the system more susceptible to density-wave instability.

arXiv comment7 pages, 10 figures, submitted

References in corpus (44)

• Quantum information with Rydberg atoms
• Many-Body Physics with Individually-Controlled Rydberg Atoms
• A Rydberg Quantum Simulator
• Realizing quantum Ising models in tunable two-dimensional arrays of single Rydberg atoms
• Programmable quantum simulation of 2D antiferromagnets with hundreds of Rydberg atoms
• Roton-maxon spectrum and stability of trapped dipolar condensates
• Experimental realization of a symmetry protected topological phase of interacting bosons with Rydberg atoms
• Three-dimensional Roton-Excitations and Supersolid formation in Rydberg-excited Bose-Einstein Condensates
• Entangling Atomic Spins with a Strong Rydberg-Dressed Interaction
• Quantum simulation and computing with Rydberg-interacting qubits
• Observation of Roton Mode Population in a Dipolar Quantum Gas
• Experimental investigations of the dipolar interactions between single Rydberg atoms
• Nonlinear quantum optics mediated by Rydberg interactions
• Nonlocal Nonlinear Optics in cold Rydberg Gases
• Collective many-body interaction in Rydberg dressed atoms
• Interactions Between Rydberg-Dressed Atoms
• Rydberg dressing: Understanding of collective many-body effects and implications for experiments
• Defect-induced supersolidity with soft-core bosons
• Probing the roton excitation spectrum of a stable dipolar Bose gas
• Supersolid Vortex Crystals in Rydberg-dressed Bose-Einstein Condensates
• Transverse-Field Ising Dynamics in a Rydberg-Dressed Atomic Gas
• Two-dimensional dipolar Bose gas with the roton-maxon excitation spectrum
• Driven-dissipative dynamics of a strongly interacting Rydberg gas
• Single-particle vs. pair superfluidity in a bilayer system of dipolar bosons
• Realization of a Rydberg-dressed Ramsey interferometer and electrometer
• Landau critical velocity in weakly interacting Bose gases
• Spin orders in the supersolid phases in binary Rydberg-dressed Bose-Einstein condensates
• The Robustness of a Collectively Encoded Rydberg Qubit
• Ground state and excitation properties of soft-core bosons
• Rydberg dressing of a one-dimensional Bose-Einstein condensate
• Spin-orbit-coupling-assisted roton softening and superstripes in a Rydberg-dressed Bose-Einstein Condensate
• Phases of dipolar bosons in a bilayer geometry
• Dynamical excitation of maxon and roton modes in a Rydberg-Dressed Bose-Einstein Condensate
• Emergence of Metallic Quantum Solid Phase in a Rydberg-Dressed Fermi Gases
• Rotons and Bose condensation in Rydberg-dressed Bose Gases
• Dipolar Bilayer with Antiparallel Polarization -- a Self-Bound Liquid
• $f$-wave superfluidity from repulsive interaction in Rydberg-dressed Fermi gas
• Phase-diagram and dynamics of Rydberg-dressed fermions in two-dimensions
• Dressing of Ultracold Atoms by their Rydberg States in a Ioffe-Pritchard Trap
• Reaching the quantum Hall regime with rotating Rydberg-dressed atoms
• Realizing the Frenkel-Kontorova model with Rydberg-dressed atoms
• Rydberg-dressed Fermi liquid: correlations and signatures of droplet crystallization
• Dipolar fermions in a multilayer geometry
• Evolution of static and dynamical density correlations in a one-dimensional soft-core gas from the Tonks-Girardeau limit to a clustering fluid