Charging Effects on Nuclear Spin Relaxation in Quantum Dots

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• 作者：Y. B. Lyanda-Geller ; I. L. Aleiner and B. L. Altshuler
• 关键词：spin relaxation ; nuclear magnetic resonance ; quantum dots ; Coulomb blockade ; spin&#x2013 ; orbit interaction
• 刊名：Journal of Superconductivity Incorporating Novel Magnetism
• 出版年：2003
• 出版时间：2003
• 年：2003
• 卷：16
• 期：4
• 页码：751-761
• 全文大小：128 KB

文摘

We study the mechanism of nuclear spin relaxation in quantum dots due to the electron exchange with 2D gas. We show that the nuclear spin relaxation rate T₁–1 is dramatically affected by the Coulomb blockade (CB) and can be controlled by gate voltage. In the case of strong spin–orbit (SO) coupling the relaxation rate is maximal in the CB valleys whereas for the weak SO coupling the maximum of 1/T₁ is near the CB peaks. The physical mechanism of nuclear spin relaxation rate at strong SO coupling is identified as Debye–Mandelstam–Leontovich–Pollak–Geballe relaxational mechanism.