Quasi-topological phases of matter and topological protection

Article

关键词: INCOMPRESSIBLE QUANTUM FLUID;    NON-ABELIAN STATISTICS;    2 DIMENSIONS;    HALL STATES;    GENERAL-THEORY;    FIELD-THEORY;    COMPUTATION;    ANYONS;    SUPERCONDUCTORS;    ORDER;   

DOI  :  10.1103/PhysRevB.87.195451

来源: SCIE

【 摘 要 】

We discuss systems which have some, but not all, of the hallmarks of topological phases. These systems' topological character is not fully captured by a local order parameter, but they are also not fully described at low energies by topological quantum field theories. For such systems, we formulate the concepts of quasi-topological phases (to be contrasted with true topological phases) and symmetry-protected quasi-topological phases. We describe examples of systems in each class and discuss the implications for topological protection of information and operations. We explain why topological phases and quasi-topological phases have greater stability than is sometimes appreciated. In the examples that we discuss, we focus on Ising-type (a.k.a. Majorana) systems particularly relevant to recent theoretical advances and experimental efforts.

【 授权许可】

Free