Spin-resolved thermal signatures of Majorana-Kondo interplay in double quantum dots

Abstract

We investigate theoretically the thermoelectric transport properties of a T-shaped double quantum dot side-coupled to a topological superconducting nanowire hosting Majorana zero-energy modes. The calculations are performed using the numerical renormalization group method focusing on the transport regime, where the system exhibits the two-stage Kondo effect. It is shown that the leakage of Majorana quasiparticles into the double dot system results in a half-suppression of the second stage of the Kondo effect, which is revealed through fractional values of the charge and heat conductances and gives rise to new resonances in the Seebeck coefficient. The heat conductance is found to satisfy a modified Wiedemann-Franz law. Finally, the interplay of Majorana-induced interference with strong electron correlations is discussed in the behavior of the spin Seebeck effect, a unique feature of the considered setup.

16 pages, 11 figures

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Cited by in corpus (11)

• Majorana differential shot noise and its universal thermoelectric crossover
• Thermoelectric processes of quantum normal-superconductor interfaces
• Nonequilibrium finite frequency resonances in differential quantum noise driven by Majorana interference
• Nonlocal thermoelectricity in quantum wires as a signature of Bogoliubov-Fermi points
• Signatures of Kondo-Majorana interplay in ac response
• Majorana Thermoelectrics and Refrigeration
• Thermoelectric fluctuations of interfering Majorana bound states
• Majorana coupling and Kondo screening of localized spins
• Tunable Fano and Dicke effects in quantum transport of double quantum dots sandwiched between topological insulators
• Continuous unitary transformation approach to the Kondo-Majorana interplay
• Revealing universal Majorana fractionalization using differential shot noise and conductance in nonequilibrium states controlled by tunneling phases