Ultrastable super-Tonks-Girardeau gases under weak dipolar interactions

Abstract

The highly excited super-Tonks-Girardeau (sTG) gas was recently observed to be extremely stable in the presence of a weak dipolar repulsion. Here we reveal the underlying reason for this mysterious phenomenon. By exactly solving the trapped small clusters with both contact and dipolar interactions, we show that the reason lies in the distinct spectral responses between sTG gas and its decaying channel (bound state) when turn on a weak dipolar interaction. Specifically, a tiny dipolar force can produce a visible energy shift for the localized bound state, but can hardly affect the extended sTG branch. As a result, the avoided level crossing between two branches is greatly modified in both location and width in the parameter axis of coupling strength, leading to a more (less) stable sTG gas for a repulsive (attractive) dipolar force. These results, consistent with experimental observations, are found to robustly apply to both bosonic and fermionic systems.

arXiv comment5+8 pages, 3+4 figures; version accepted by PRL

References in corpus (24)

• Realization of an Excited, Strongly-Correlated Quantum Gas Phase
• Fermionization of two distinguishable fermions
• Confinement-Induced Resonances in Low-Dimensional Quantum Systems
• Beyond Tonks-Girardeau: strongly correlated regime in quasi-one-dimensional Bose gases
• Antiferromagnetic Heisenberg Spin Chain of a Few Cold Atoms in a One-Dimensional Trap
• Strongly interacting confined quantum systems in one dimension
• Dipolar gases in quasi one-dimensional geometries
• Quantum magnetism without lattices in strongly interacting one-dimensional spinor gases
• Strong-coupling ansatz for the one-dimensional Fermi gas in a harmonic potential
• Fermionization of two-component few-fermion systems in a one-dimensional harmonic trap
• Evidence for the super Tonks-Girardeau gas
• Creating quantum many-body scars through topological pumping of a 1D dipolar gas
• Strongly Interacting Quantum Gases in One-Dimensional Traps
• Ground-State Ferromagnetic Transition in Strongly Repulsive One-Dimensional Fermi Gases
• Effective spin-chain model for strongly interacting one-dimensional atomic gases with an arbitrary spin
• Coherent molecule formation in anharmonic potentials near confinement-induced resonances
• Inelastic Confinement-Induced Resonances in Low-Dimensional Quantum Systems
• Ferromagnetic spin correlations in a few-fermion system
• Super-Tonks-Girardeau gas of spin-1/2 interacting fermions
• Dipolar confinement-induced resonances of ultracold gases in waveguides
• Three s-wave interacting fermions under anisotropic harmonic confinement: Dimensional crossover of energetics and virial coefficients
• Three interacting atoms in a one-dimensional trap: A benchmark system for computational approaches
• New anatomy of quantum holonomy
• Quasi-One-Dimensional Dipolar Quantum Gases

Cited by in corpus (4)

• Interaction quench of dipolar bosons in a one-dimensional optical lattice
• Strongly Repulsive 1D Gases at Higher Branches: Spin-Charge Correlation and Coupled Spin-Chain Model
• Exotic critical states as fractional Fermi seas in the one-dimensional Bose gas
• Effects of intertube dipole-dipole interactions in nearly integrable one-dimensional ${}^{162}$Dy gases