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】
Free