Effect of measurement probes upon the conductance of an interacting nanosystem: Detection of an attached ring by non local many body effects

TL;DR

This paper investigates how measurement probes and magnetic flux influence the conductance of an interacting nanosystem, revealing large Aharonov-Bohm oscillations due to non-local many-body effects.

Contribution

It demonstrates that non-local many-body interactions can significantly affect nanosystem conductance, especially when a ring is attached and magnetic flux varies.

Findings

Aharonov-Bohm oscillations depend on probe distance Lc

Oscillation amplitude increases with degenerate levels near Fermi energy

Interactions inside the nanosystem enhance non-local effects

Abstract

We consider a nanosystem connected to measurement probes via leads. When a magnetic flux is varied through a ring attached to one lead at a distance Lc from the nanosystem, the effective nanosystem transmission |ts|^2 exhibits Aharonov-Bohm oscillations if the electrons interact inside the nanosystem. These oscillations can be very large if Lc is small and if the nanosystem has almost degenerate levels which are put near the Fermi energy by a local gate.