Double quantum dots defined in bilayer graphene

作     者：D. P. Żebrowski F. M. Peeters B. Szafran 

作者机构：Faculty of Physics and Applied Computer Science AGH University of Science and Technology aleja Mickiewicza 30 30-059 Kraków Poland Departement Fysica Universiteit Antwerpen Groenenborgerlaan 171 2020 Antwerpen Belgium 

出 版 物：《Physical Review B》 (Phys. Rev. B)

年 卷 期：2017年第96卷第3期

页      面：035434-035434页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：This work was supported by the National Science Centre according to decision DEC-2013/11/B/ST3/03837 and by the Flemish Science Foundation (FWO-VL) 

主　　题：Coulomb blockade Electronic structure Semiconductors Bilayer films Double quantum dots Graphene Tight-binding model 

摘      要：Artificial molecular states of double quantum dots defined in bilayer graphene are studied with the atomistic tight-binding method and its low-energy continuum approximation. We indicate that the extended electron wave functions have opposite parities on sublattices of the layers and that the ground-state wave-function components change from bonding to antibonding with the interdot distance. In the weak-coupling limit, the one most relevant for quantum dots defined electrostatically, the signatures of the interdot coupling include, for the two-electron ground state, formation of states with symmetric or antisymmetric spatial wave functions split by the exchange energy. In the high-energy part of the spectrum the states with both electrons in the same dot are found with the splitting of energy levels corresponding to simultaneous tunneling of the electron pair from one dot to the other.