Cross-correlations between currents and tunnel magnetoresistance in interacting double quantum dot-Majorana wire...

Area of Science:

• Condensed Matter Physics
• Quantum Information Science

Background:

• Majorana zero-energy modes are exotic quasiparticles with potential applications in topological quantum computing.
• Quantum dots coupled to topological superconductors offer a platform to study Majorana physics.

Purpose of the Study:

• To theoretically investigate the spin and charge transport properties of a double quantum dot system coupled to Majorana zero-energy modes.
• To analyze the influence of detuning protocols on transport characteristics and current cross-correlations.
• To explore methods for identifying Majorana presence through transport measurements.

Main Methods:

• Theoretical investigation of spin and charge transport.
• Analysis of current flow through left and right junctions and their cross-correlations.
• Examination of spin-dependent transport and non-local zero bias anomaly.

Main Results:

• Symmetric detuning shows resonant tunneling with weak cross-correlations.
• Antisymmetric detuning leads to maximized, correlated currents in one bias direction and spin blockade in the other.
• Suppressed current cross-correlations indicate Majorana involvement.
• Non-local zero bias anomaly reveals a device operational mode for Majorana identification.

Conclusions:

• The system exhibits distinct transport behaviors based on detuning protocols, offering insights into Majorana properties.
• Spin-dependent transport analysis and zero bias anomaly are crucial for identifying Majorana modes.
• The study proposes a method for detecting Majorana zero-energy modes in quantum dot-nanowire systems.