New state of matter in one-dimensional quantum gas

Phys.org  January 14, 2021 Long-lived excited states of interacting quantum systems that retain quantum correlations and evade thermalization are of great fundamental interest. A team of researchers in the US (Stanford University, City University of New York) created nonthermal states in a bosonic one-dimensional (1D) quantum gas of dysprosium by stabilizing a super-Tonks-Girardeau gas against collapse and thermalization with repulsive long-range dipolar interactions. Stiffness and energy-per-particle measurements show that the system is dynamically stable regardless of contact interaction strength. This enables us to cycle contact interactions from weakly to strongly repulsive, then strongly attractive, and finally weakly attractive. They showed […]

A Metal-like Quantum Gas: A pathbreaking platform for quantum simulation

EurekAlert  June 22, 2020 Electronic properties of condensed matter are often determined by an intricate competition between kinetic energy that aims to overlap and delocalize electronic wave functions across the crystal lattice, and localizing electron-electron interactions. In contrast, the gaseous phase is characterized by valence electrons tightly localized around the ionic atom cores in discrete quantum states with well-defined energies. A hybrid state of matter is created when a gas of isolated atoms is suddenly excited to a state where electronic wave functions spatially overlap like in a solid. Researchers in Japan created such a hybrid state with overlapping high-lying electronic […]