Modulation of photon current through an oscillation device coupled with Majorana fermions

Abstract

Abstract Photon current is investigated for the system with photon reservoirs intermediating a mesoscopic oscillation device possessing the oscillator energy ℏω 0 coupled with Majorana bound states (MBSs). The Landauer-like photon current formula is derived by employing the nonequilibrium Green’s function approach. MBSs play the role for modulating photon current, where the coupling constant λ for connecting MBSs with the central oscillation device, the coupling energy ɛ M between two MBSs, as well as the magnetic flux Φ threading through the oscillation device contribute explicit effects to control the out-put photon current. The periodic oscillation behavior of photon current with respect to the magnetic flux is modulated sensitively by the coupled MBSs. The suppression of photon current is displayed in the region ɛ M = 0 ∼ 1.0ℏω 0, and the suppression is strengthened when the coupling constant λ becomes larger. In the region as ɛ M = 1.0ℏω 0 ∼ 2.0ℏω 0, the photon current increases firstly from its minimum value at ɛ M = 1.0ℏω 0 to reach its maximum value as ɛ M increases, and then it declines monotonously. Our investigated system can be taken as a photon modulator achieved by connecting a superconducting quantum interference device with coupled MBSs.