Correlational Origin of the Roton Minimum

Abstract

We present compelling evidence supporting the conjecture that the origin of the roton in Bose-condensed systems arises from strong correlations between the constituent particles. By studying the two dimensional bosonic dipole systems a paradigm, we find that classical molecular dynamics (MD) simulations provide a faithful representation of the dispersion relation for a low- temperature quantum system. The MD simulations allow one to examine the effect of coupling strength on the formation of the roton minimum and to demonstrate that it is always generated at a sufficiently high enough coupling. Moreover, the classical images of the roton-roton, roton-maxon, etc. states also appear in the MD simulation spectra as a consequence of the strong coupling.

7 pages, 4 figures

References in corpus (5)

• Quantum phase transition in a two-dimensional system of dipoles
• Dynamical correlations and collective excitations of Yukawa liquids
• Effects of strong correlations for 2D Bose-Einstein condensed dipolar excitons
• Weakly interacting two-dimensional system of dipoles: limitations of mean-field theory
• Acoustic dispersion in a two-dimensional dipole system

Cited by in corpus (13)

• Electronic Density Response of Warm Dense Matter
• Collective and single-particle excitations in 2D dipolar Bose gases
• Dynamics of two-dimensional dipole systems
• Prediction of a roton-type feature in warm dense hydrogen
• Collective Modes in Two Dimensional Binary Yukawa Systems
• Strong Coupling Effects in Binary Yukawa Systems
• Classical Rotons in Cold Atomic Traps
• Dynamic properties and the roton mode attenuation in the liquid 3He: an ab initio study within the self-consistent method of moments
• Electronic rotons and Wigner crystallites in a two-dimensional dipole liquid
• Strongly coupled Yukawa trilayer liquid: Structure and dynamics
• Wave spectroscopy in a driven granular material
• Quantum theory of spin waves for Helical ground states in Hollandite lattice
• Roton-Induced Trapping in Strongly Correlated Rydberg Gases