Majorana bound states in a driven quantum dot

We study a periodically driven quantum dot in two different configurations. In the first setup, a quantum dot coupled to a topological superconductor and a normal metal lead. In the second setup, a T-shape quantum dot connected to two topological superconductors and side coupled to a normal metal lead. By a combination of non-equilibrium Green's function techniques and Floquet's formalism, we obtain the quasienergy spectra as a function of the amplitude, frequency, and superconducting phase difference. We show that the states develop unique electronic responses, such as the broken particle-hole symmetry that appears when considering the non-locality of Majorana bound states. Finally, we compute the time-average current and the differential conductance to reveal these spectra signatures through physically measurable magnitudes in the two proposed configurations.

Automated summary

We investigate periodically driven quantum dots in two different setups - one coupled to a topological superconductor and a normal metal lead, and the other connected to two topological superconductors and side-coupled to a normal metal lead. Using non-equilibrium Green's function techniques and Floquet formalism, we obtain the quasienergy spectra as a function of amplitude, frequency, and superconducting phase difference. Our results show unique electronic responses, such as broken particle-hole symmetry resulting from the non-locality of Majorana bound states. We also calculate time-averaged current and differential conductance to experimentally detect these spectral signatures in the proposed configurations.