Coherent spinor dynamics in a spin-1 Bose condensate
| Autor: | Qishu Qin, Wenxian Zhang, Michael Chapman, Li You, Ming-Shien Chang |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Physics
Condensed Matter::Quantum Gases Bose gas Spin states General Physics and Astronomy FOS: Physical sciences law.invention Condensed Matter - Other Condensed Matter law Coherent control Quantum state Quantum mechanics Fermi gas Bose–Einstein condensate Spin-½ Boson Other Condensed Matter (cond-mat.other) |
| DOI: | 10.48550/arxiv.cond-mat/0509341 |
| Popis: | Collisions in a thermal gas are perceived as random or incoherent as a consequence of the large numbers of initial and final quantum states accessible to the system. In a quantum gas, e.g. a Bose-Einstein condensate or a degenerate Fermi gas, the phase space accessible to low energy collisions is so restricted that collisions be-come coherent and reversible. Here, we report the observation of coherent spin-changing collisions in a gas of spin-1 bosons. Starting with condensates occupying two spin states, a condensate in the third spin state is coherently and reversibly created by atomic collisions. The observed dynamics are analogous to Josephson oscillations in weakly connected superconductors and represent a type of matter-wave four-wave mixing. The spin-dependent scattering length is determined from these oscillations to be -1.45(18) Bohr. Finally, we demonstrate coherent control of the evolution of the system by applying differential phase shifts to the spin states using magnetic fields. Comment: 19 pages, 3 figures |
| Databáze: | OpenAIRE |
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