edoc: No conditions. Results ordered -Date Deposited. 2024-08-09T22:42:31ZEPrintshttps://edoc.unibas.ch/images/uni-logo.jpghttps://edoc.unibas.ch/2015-02-06T09:59:10Z2017-05-10T10:37:14Zhttps://edoc.unibas.ch/id/eprint/35383This item is in the repository with the URL: https://edoc.unibas.ch/id/eprint/353832015-02-06T09:59:10ZAdiabatic quantum pumping of chiral Majorana fermionsWe investigate adiabatic quantum pumping of chiral Majorana states in a system composed of two Mach-Zehnder type interferometers coupled via a quantum point contact. The pumped current is generated by periodic modulation of the phases accumulated by traveling around each interferometer. Using scattering matrix formalism we show that the pumped current reveals a definite signature of the chiral nature of the Majorana states involved in transport in this geometry. Furthermore, by tuning the coupling between the two interferometers the pump can operate in a regime where finite pumped current and zero conductance are expected. M. Alos-PalopRakesh P. TiwariM. Blaauboer2014-03-27T13:12:59Z2014-03-27T13:12:59Zhttps://edoc.unibas.ch/id/eprint/31655This item is in the repository with the URL: https://edoc.unibas.ch/id/eprint/316552014-03-27T13:12:59ZSuppression of conductance in a topological insulator nanostep junctionWe investigate quantum transport via surface states in a nanostep junction on the surface of a three-dimensional topological insulator that involves two different side surfaces. We calculate the conductance across the junction within the scattering matrix formalism and find that as the bias voltage is increased, the conductance of the nanostep junction is suppressed by a factor of 1/3 (independent of the system parameters) as compared to the conductance of a similar planar junction based on a single surface of a topological insulator. We also calculate and analyze the Fano factor of the nanostep junction and predict that the Fano factor saturates at 1/5, five times smaller than for a Poisson process. DOI: 10.1103/PhysRevB.87.035432 M. Alos-PalopRakesh P. TiwariM. Blaauboer