Probing the dichotomy between Yu-Shiba-Rusinov and Majorana bound states via conductance, quantum noise and $Δ_T$ noise

• URL: http://arxiv.org/abs/2406.16717v3
• Date: Tue, 01 Apr 2025 01:55:31 GMT
• Title: Probing the dichotomy between Yu-Shiba-Rusinov and Majorana bound states via conductance, quantum noise and $Δ_T$ noise
• Authors: Sachiraj Mishra, Colin Benjamin,
• Abstract summary: We analyze Yu-Shiba-Rusinov (YSR) states from Majorana bound states (MBS) in a one-dimensional metal/spin-flipper/metal/insulator/superconductor junction.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We explore the potential of charge and spin conductance as well as charge and spin quantum noise and $\Delta_T$ noise as probes to analyze and contrast Yu-Shiba-Rusinov (YSR) states from Majorana bound states (MBS) in a one-dimensional metal/spin-flipper/metal/insulator/superconductor junction. YSR bound states, induced by magnetic impurities acting as spin-flippers within the superconducting gap, are distinct from MBS, which can also arise in systems with magnetic impurities, such as magnetic adatoms on superconductors, often leading to false positives in MBS detection. Replacing a trivial $s$-wave superconductor with a topological superconductor featuring triplet pairing, e.g., chiral-$p$ or spinless $p$-wave superconducting nanowire, we analyze and establish clear distinctions between YSR states and MBS. This work provides an unique signature for YSR states, demonstrating that charge or spin conductance as well as both charge and spin quantum noise, along their $\Delta_T$ noise counterparts are effective in identifying YSR bound states and distinguishing them from MBS.

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