Quasiparticle tunneling in the lowest Landau level

Article

关键词: QUANTUM HALL STATES;    POINT CONTACTS;    EDGE;    EXCITATIONS;    CHARGE;    TRANSPORT;    REGIME;   

DOI  :  10.1103/PhysRevB.97.245305

来源: SCIE

【 摘 要 】

We measure quasiparticle tunneling across a constriction in the first Landau level. In the limit of weak backscattering, the dependence of the tunneling conductance on temperature and dc-bias is in qualitative disagreement with existing theories. For stronger backscattering, data obtained in the v = 1/3 state can be fitted to weak backscattering theory with the predicted effective fractional charge of e(*) = e/3. The scaling parameter g is however not universal and depends strongly on the gate voltage applied to the constriction. At v = 4/3, a more complex picture emerges. We propose an interpretation in terms of selective tunneling between the multiple modes present at the edge.

【 授权许可】

Free