Superfluidity and spin superfluidity in spinor Bose gases
| Autor: | Armaitis, J., Duine, R. A., Sub Algemeen Theoretical Physics, Sub Cond-Matter Theory, Stat & Comp Phys, Theoretical Physics |
|---|---|
| Přispěvatelé: | Physics of Nanostructures, Sub Algemeen Theoretical Physics, Sub Cond-Matter Theory, Stat & Comp Phys, Theoretical Physics |
| Rok vydání: | 2017 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Zeeman effect Spinor Condensed matter physics Condensed Matter - Mesoscale and Nanoscale Physics Condensed Matter::Other Magnon FOS: Physical sciences 01 natural sciences 010305 fluids & plasmas Superfluidity Magnetization symbols.namesake Quantum Gases (cond-mat.quant-gas) Quantum mechanics 0103 physical sciences Mesoscale and Nanoscale Physics (cond-mat.mes-hall) symbols 010306 general physics Condensed Matter - Quantum Gases Order of magnitude Stationary state Spin-½ |
| Zdroj: | Physical Review A Physical Review A-Atomic, Molecular, and Optical Physics, 95(5). American Physical Society Physical Review A, 95(5):053607, 1-10. American Physical Society |
| ISSN: | 2469-9926 1050-2947 |
| DOI: | 10.1103/PhysRevA.95.053607 |
| Popis: | We show that spinor Bose gases subject to a quadratic Zeeman effect exhibit coexisting superfluidity and spin superfluidity, and study the interplay between these two distinct types of superfluidity. To illustrate that the basic principles governing these two types of superfluidity are the same, we describe the magnetization and particle-density dynamics in a single hydrodynamic framework. In this description spin and mass supercurrents are driven by their respective chemical potential gradients. As an application, we propose an experimentally accessible stationary state, where the two types of supercurrents counterflow and cancel each other, thus resulting in no mass transport. Furthermore, we propose a straightforward setup to probe spin superfluidity by measuring the in-plane magnetization angle of the whole cloud of atoms. We verify the robustness of these findings by evaluating the four-magnon collision time, and find that the time scale for coherent (superfluid) dynamics is separated from that of the slower incoherent dynamics by one order of magnitude. Comparing the atom and magnon kinetics reveals that while the former can be hydrodynamic, the latter is typically collisionless under most experimental conditions. This implies that, while our zero-temperature hydrodynamic equations are a valid description of spin transport in Bose gases, a hydrodynamic description that treats both mass and spin transport at finite temperatures may not be readily feasible. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|