Quantum pump for spin and charge transport in a Luttinger liquid.
Quantum pump for spin and charge transport in a Luttinger liquid.
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DOI：
10.1103/physrevlett.87.096401
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发表时间：
2000-11
影响因子：
8.6
通讯作者：
Prashant Sharma;C. Chamon
中科院分区：
文献类型：
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作者：
Prashant Sharma;C. Chamon
我们研究了两种不同的参数泵-一个用于泵自旋电流，其他的电荷电流-在相互作用的量子线。我们发现，作为泵浦频率的函数，每个周期泵浦的自旋或电荷有一个非通用的交叉-取决于泵浦细节-两个通用的固定点值0和两倍的电子自旋或电荷量子数之间。这两个固定点之间的流动方向取决于相互作用是排斥的还是吸引的，而量子化本身就是相互作用的标志。
We study two different parametric pumps--one for pumping spin currents, the other for charge currents--in interacting quantum wires. We find that, as a function of pumping frequency, the spin or charge pumped per cycle has a nonuniversal crossover--depending on pumping details--between two universal fixed point values of 0 and twice the electronic spin or charge quantum number. The direction of flow between these two fixed points depends on whether the interactions are repulsive or attractive, while the quantization itself is a signature of interactions.