Transport properties and quantum phase transitions in one-dimensional superconductor-ferromagnetic insulator heterostructures

• URL: http://arxiv.org/abs/2410.14887v1
• Date: Fri, 18 Oct 2024 22:25:50 GMT
• Title: Transport properties and quantum phase transitions in one-dimensional superconductor-ferromagnetic insulator heterostructures
• Authors: Javier Feijóo, Aníbal Iucci, Alejandro M. Lobos,
• Abstract summary: We propose a one-dimensional electronic nanodevice inspired in recently fabricated semiconductor-superconductor-ferromagnetic insulator hybrids. We show that the device can be tuned across spin- and fermion parity-changing QPTs by adjusting the FMI layer length orange and/or by applying a global backgate voltage. Our findings suggest that these effects are experimentally accessible and offer a robust platform for studying quantum phase transitions in hybrid nanowires.
• Score: 44.99833362998488
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• Abstract: We theoretically propose a one-dimensional electronic nanodevice inspired in recently fabricated semiconductor-superconductor-ferromagnetic insulator (SE-SC-FMI) hybrid heterostructures, and investigate its zero-temperature transport properties. While previous related studies have primarily focused on the potential for generating topological superconductors hosting Majorana fermions, we propose an alternative application: using these hybrids to explore controllable quantum phase transitions (QPTs) detectable through transport measurements. Our study highlights two key differences from existing devices: first, the length of the FMI layer is shorter than that of the SE-SC heterostructure, introducing an inhomogeneous Zeeman interaction with significant effects on the induced Andreev bound states (ABS). Second, we focus on semiconductor nanowires with minimal or no Rashba spin-orbit interaction, allowing for the induction of spin-polarized ABS and high-spin quantum ground states. We show that the device can be tuned across spin- and fermion parity-changing QPTs by adjusting the FMI layer length orange and/or by applying a global backgate voltage, with zero-energy crossings of subgap ABS as signatures of these transitions. Our findings suggest that these effects are experimentally accessible and offer a robust platform for studying quantum phase transitions in hybrid nanowires.

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