Quantum phase transitions into Kondo states in bilayer graphene

Article

关键词: RENORMALIZATION-GROUP;    FERMI SYSTEMS;    ANDERSON;    IMPURITY;    GAP;   

DOI  :  10.1103/PhysRevB.89.081101

来源: SCIE

【 摘 要 】

We study a magnetic impurity intercalated in bilayer graphene. A representative configuration generates a hybridization function with strong dependence on the conduction-electron energy, including a full gap with one hard and one soft edge. Shifts of the chemical potential via gating or doping drive the system between non-Kondo (free-moment) and Kondo-screened phases, with strong variation of the Kondo scale. Quantum phase transitions near the soft edge are of Kosterlitz-Thouless type, while others are first order. Near the hard edge, a bound-state singlet appears inside the gap; although of single-particle character, its signatures in scanning tunneling spectroscopy are very similar to those arising from a many-body Kondo resonance.

【 授权许可】

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