Dias da Silva Luis G G V, Sandler Nancy P, Ingersent Kevin, Ulloa Sergio E
Department of Physics and Astronomy, Nanoscale and Quantum Phenomena Institute, Ohio University, Athens, Ohio 45701-2979, USA.
Phys Rev Lett. 2006 Sep 1;97(9):096603. doi: 10.1103/PhysRevLett.97.096603. Epub 2006 Aug 30.
Double quantum dots offer unique possibilities for the study of many-body correlations. A system containing one Kondo dot and one effectively noninteracting dot maps onto a single-impurity Anderson model with a structured (nonconstant) density of states. Numerical renormalization-group calculations show that, while band filtering through the resonant dot splits the Kondo resonance, the singlet ground state is robust. The system can also be continuously tuned to create a pseudogapped density of states and access a quantum-critical point separating Kondo and non-Kondo phases.
双量子点为多体关联的研究提供了独特的可能性。一个包含一个近藤点和一个有效非相互作用点的系统映射到一个具有结构化（非恒定）态密度的单杂质安德森模型。数值重整化群计算表明，虽然通过共振点的能带滤波会分裂近藤共振，但单重基态是稳健的。该系统还可以连续调节以产生赝能隙态密度，并进入分离近藤相和非近藤相的量子临界点。
