Enhancement in tunneling density of states in a Luttinger liquid: Role of nonlocal interaction

Article

关键词: FERMI-EDGE SINGULARITY;    QUANTUM HALL STATES;    SPECTRAL PROPERTIES;    POINT-CONTACT;    TRANSPORT;    BACKSCATTERING;    PERTURBATION;    EXCITATIONS;    CATASTROPHE;    TRANSITION;   

DOI  :  10.1103/PhysRevB.104.045402

来源: SCIE

【 摘 要 】

Power-law suppression of local electronic tunneling density of states (TDOS) in the zero-energy limit is a hallmark of the Luttinger liquid (LL) phase of the interacting one-dimensional electron system. We present a theoretical model which hosts the LL state with the surprising feature of enhancement rather than suppression in local TDOS originating from nonlocal and repulsive density-density interactions. Importantly, we find enhancement of TDOS in the manifold of parameter space where the system is stable in the renormalization group (RG) sense. We argue that enhancement of TDOS along with RG stability is possible only when the system has broken parity symmetry about the position of local TDOS enhancement. Such a model could be realized on the edge states of a bilayer quantum Hall system where both intralayer and interlayer density-density interactions are present mimicking the role of local and nonlocal interactions, respectively.

【 授权许可】

Free