Tunable Exchange Interaction in Quantum Dot Devices
Tunable Exchange Interaction in Quantum Dot Devices
复制标题
量子点器件中可调节的交换相互作用
DOI：
10.1143/jjap.43.l691
复制
发表时间：
2004
影响因子：
1.5
通讯作者：
H. Takayanagi
中科院分区：
文献类型：
--
作者：
H. Tamura;K. Shiraishi;H. Takayanagi
从理论上讨论了半导体量子点之间的Ruderman-Kittel-Kasuya-Yosida（RKKY）相互作用。当具有局部自旋的每个QD耦合到半导体中的传导电子时，间接交换相互作用，即，RKKY相互作用是在两个局部自旋之间引起的。量子点之间的RKKY相互作用是由半导体中的费米海介导的，通过改变费米能可以调制交换相互作用的大小甚至符号，从而导致量子点器件中的可调磁跃迁。我们估计的RKKY量子点相互作用的大小作为电子密度和点间距离的函数。
We theoretically discuss the Ruderman-Kittel-Kasuya-Yosida (RKKY) interaction between semiconductor quantum dots (QDs). When each QD having a local spin is coupled to the conduction electrons in semiconductors, an indirect exchange interaction, i.e., the RKKY interaction, is induced between two local spins. The RKKY interaction between QDs, which is mediated by the Fermi sea in semiconductors, is modulated by changing the Fermi energy, and the magnitude or even the sign of the exchange interaction can be tuned, which leads to a tunable magnetic transition in QD devices. We estimate the magnitude of the RKKY interaction in QDs as a function of the electron density and the inter-dot distance.