• 文献标题:   Charge Number Dependence of the Dephasing Rates of a Graphene Double Quantum Dot in a Circuit QED Architecture
  • 文献类型:   Article
  • 作  者:   DENG GW, WEI D, JOHANSSON JR, ZHANG ML, LI SX, LI HO, CAO G, XIAO M, TU T, GUO GC, JIANG HW, NORI F, GUO GP
  • 作者关键词:  
  • 出版物名称:   PHYSICAL REVIEW LETTERS
  • ISSN:   0031-9007 EI 1079-7114
  • 通讯作者地址:   Univ Sci Technol China
  • 被引频次:   36
  • DOI:   10.1103/PhysRevLett.115.126804
  • 出版年:   2015

▎ 摘  要

We use an on-chip superconducting resonator as a sensitive meter to probe the properties of graphene double quantum dots at microwave frequencies. Specifically, we investigate the charge dephasing rates in a circuit quantum electrodynamics architecture. The dephasing rates strongly depend on the number of charges in the dots, and the variation has a period of four charges, over an extended range of charge numbers. Although the exact mechanism of this fourfold periodicity in dephasing rates is an open problem, our observations hint at the fourfold degeneracy expected in graphene from its spin and valley degrees of freedom.