Kamenev A
Department of Physics, Technion, Haifa 32000, Israel.
Phys Rev Lett. 2000 Nov 6;85(19):4160-3. doi: 10.1103/PhysRevLett.85.4160.
Coulomb blockade in a quantum dot attached to a diffusive conductor is considered in the framework of the nonlinear sigma model. It is shown that the weak charge quantization on the dot is associated with instanton configurations of the Q field in the conductor. The instantons have a finite action and are replica nonsymmetric. It is argued that such instantons may play a role in the transition regime to the interacting insulator.
在非线性西格玛模型的框架下，研究了连接到扩散导体的量子点中的库仑阻塞。结果表明，量子点上的弱电荷量子化与导体中Q场的瞬子构型有关。瞬子具有有限的作用量且是非复本对称的。有人认为，这种瞬子可能在向相互作用绝缘体的转变过程中发挥作用。
