Bloch oscillations in a one-dimensional spinor gas.
Bloch oscillations in a one-dimensional spinor gas.
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DOI：
10.1103/physrevlett.102.070402
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发表时间：
2008-11
影响因子：
8.6
通讯作者：
D. Gangardt;A. Kamenev
中科院分区：
文献类型：
--
作者：
D. Gangardt;A. Kamenev
施加在一维旋量气体中自旋翻转的粒子上的力可能导致粒子位置和速度的布洛赫振荡。布洛赫振荡的存在主要取决于其余气体对自旋激发所施加的粘性摩擦力。我们用量子流体参数来计算摩擦。特别地，我们证明了摩擦在可积的情况下是不存在的，例如玻色子或费米子的SU(2)对称气体。对于与精确可积性的微小偏差，摩擦非常弱，这为观察布洛赫振荡提供了可能。
A force applied to a spin-flipped particle in a one-dimensional spinor gas may lead to Bloch oscillations of the particle's position and velocity. The existence of Bloch oscillations crucially depends on the viscous friction force exerted by the rest of the gas on the spin excitation. We evaluate the friction in terms of the quantum fluid parameters. In particular, we show that the friction is absent for integrable cases, such as an SU(2) symmetric gas of bosons or fermions. For small deviations from the exact integrability the friction is very weak, opening the possibility to observe Bloch oscillations.