Sela Eran, Affleck Ian
Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, Canada, V6T 1Z1.
Phys Rev Lett. 2009 Jan 30;102(4):047201. doi: 10.1103/PhysRevLett.102.047201. Epub 2009 Jan 29.
While violations of the Fermi liquid paradigm for metals are of great interest in various physical systems, quantum impurity models are among the few cases where exact theoretical results are available. Double quantum dots can provide an experimental realization of the 2 impurity Kondo model which exhibits a non-Fermi-liquid quantum critical point at a special value of its parameters. We present an exact universal result for the finite temperature nonlinear conductance along the crossover from this quantum critical point to the low energy Fermi liquid phase.
虽然金属中违反费米液体范式的情况在各种物理系统中备受关注，但量子杂质模型是少数能得到精确理论结果的情况之一。双量子点可以为两杂质近藤模型提供一种实验实现方式，该模型在其参数的特定值处展现出一个非费米液体量子临界点。我们给出了沿着从这个量子临界点到低能费米液体相的转变过程中有限温度下非线性电导的精确通用结果。
