Two classes of Mott insulator | |
Article | |
关键词: VALENCE-BOND STATE; HIGH-TEMPERATURE SUPERCONDUCTORS; PHASE-SEPARATION; ISING-MODEL; TRANSITIONS; INSTABILITY; TOPOLOGY; SYMMETRY; LATTICE; VERGE; | |
DOI : 10.1103/PhysRevB.67.024506 | |
来源: SCIE |
【 摘 要 】
There are two classes of Mott insulators in nature, distinguished by their responses to weak doping. With increasing chemical potential, type I Mott insulators undergo a first order phase transition from the undoped to the doped phase. In the presence of long-range Coulomb interactions, this leads to an inhomogeneous state exhibiting micro-phase separation. In contrast, in type II Mott insulators charges go in continuously above a critical chemical potential. We show that if the insulating state has a broken symmetry, this increases the likelihood that it will be type I. There exists a close analogy between these two types of Mott insulators and the familiar type I and type II superconductors.
【 授权许可】
Free