Probing the topological character of superconductors via non-local Hanbury-Brown and Twiss correlations

• URL: http://arxiv.org/abs/2103.14920v2
• Date: Tue, 16 Aug 2022 12:12:10 GMT
• Title: Probing the topological character of superconductors via non-local Hanbury-Brown and Twiss correlations
• Authors: Tusaradri Mohapatra, Subhajit Pal, Colin Benjamin
• Abstract summary: Topological superconductors can be classified as chiral or helical. Topological superconductors are associated with Majorana fermions which are important for topological quantum computation.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Superconductors can be classified as topological or not based on whether time-reversal symmetry (TRS), chiral symmetry, and particle-hole symmetry are preserved or not. Further, topological superconductors can also be classified as chiral or helical. In this paper, using Hanbury-Brown and Twiss (HBT) shot noise correlations and the non-local conductance, we probe metal/2D unconventional superconductor/metal junctions to understand better the pairing topological vs. non-topological or helical vs. chiral or nodal vs. gapful. We see that HBT correlations are asymmetric as a function of bias voltage for non-topological superconductors, whereas they are symmetric for topological superconductors irrespective of the barrier strength. Topological superconductors are associated with Majorana fermions which are important for topological quantum computation. By distinguishing topological superconductors from non-topological superconductors, our study will help search for Majorana fermions, which will aid in designing a topological quantum computer.

Related papers

• Mesoscopic theory of the Josephson junction [44.99833362998488]
  We derive a mesoscopic theory of the Josephson junction from non-relativistic scalar electrodynamics. By providing an ab initio derivation of the charge qubit Hamiltonian, we progress toward the quantum engineering of superconducting circuits at the subnanometer scale.
  arXiv  Detail & Related papers  (2024-11-08T15:29:07Z)
• Transport properties and quantum phase transitions in one-dimensional superconductor-ferromagnetic insulator heterostructures [44.99833362998488]
  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.
  arXiv  Detail & Related papers  (2024-10-18T22:25:50Z)
• Spectral Signatures of Non-Trivial Topology in a Superconducting Circuit [0.0]
  We show that a superconducting circuit with three Josephson tunnel junctions in parallel can possess degeneracies indicative of nontrivial topology. Measurements show that devices fabricated in different topological regimes fall on a simple phase diagram which should be robust to junction imperfections and geometric inductance.
  arXiv  Detail & Related papers  (2024-01-19T18:40:30Z)
• Topological Superconductivity in Two-Dimensional Altermagnetic Metals [1.779681639954815]
  We study the effect of altermagnetism on the superconductivity of a two-dimensional metal with d-wave altermagnetism and Rashba spin-orbital coupling. We show that a number of topological superconductors, including both first-order and second-order ones, can emerge when the p-wave pairing dominates.
  arXiv  Detail & Related papers  (2023-05-17T18:00:00Z)
• Thermoelectric properties of topological chains coupled to a quantum dot [40.19796930944118]
  Topological one-dimensional superconductors can sustain in their extremities zero energy modes that are protected by different kinds of symmetries. We consider the simplest kind of topological insulators, namely chains of atoms with hybridized $sp$ orbitals. We show that the electrical conductance and the Wiedemann-Franz ratio of the device at the topological transition have universal values at very low temperatures.
  arXiv  Detail & Related papers  (2021-12-20T22:52:00Z)
• Anomalous Floquet Chiral Topological Superconductivity in a Topological Insulator Sandwich Structure [0.0]
  We show that Floquet chiral topological superconductivity arises naturally in Josephson junctions made of magnetic topological insulator-superconductor sandwich structures. The bias voltage acts as a tuning parameter enabling novel dynamical topological quantum phase transitions. Our theory establishes a new paradigm for realizing Floquet chiral topological superconductivity in solid-state systems.
  arXiv  Detail & Related papers  (2020-12-01T19:00:01Z)
• Quantum Sensors for Microscopic Tunneling Systems [58.720142291102135]
  tunneling Two-Level-Systems (TLS) are important for micro-fabricated quantum devices such as superconducting qubits. We present a method to characterize individual TLS in virtually arbitrary materials deposited as thin-films. Our approach opens avenues for quantum material spectroscopy to investigate the structure of tunneling defects.
  arXiv  Detail & Related papers  (2020-11-29T09:57:50Z)
• Self-organized topological insulator due to cavity-mediated correlated tunneling [0.0]
  We discuss a model where topology emerges from the quantum interference between single-particle dynamics and global interactions. The onset of quantum interference leads to spontaneous breaking of the lattice translational symmetry. The emerging quantum phase is a topological insulator and is found at half fillings.
  arXiv  Detail & Related papers  (2020-11-03T13:23:06Z)
• Quantum electrodynamics in a topological waveguide [47.187609203210705]
  In this work we investigate the properties of superconducting qubits coupled to a metamaterial waveguide based on a photonic analog of the Su-Schrieffer-Heeger model. We explore topologically-induced properties of qubits coupled to such a waveguide, ranging from the formation of directional qubit-photon bound states to topology-dependent cooperative radiation effects.
  arXiv  Detail & Related papers  (2020-05-08T00:22:17Z)
• Topological superconductor from superconducting topological surface states and fault-tolerant quantum computing [6.394072140094434]
  A widely believed chiral $p$-wave superfluid is the Moore-Read state in the $nu=frac52$ fractional quantum Hall effect. Here we report a new mechanism for realizing 2D chiral $p$-wave superconductors on the surface of 3D $s$-wave superconductors.
  arXiv  Detail & Related papers  (2020-03-26T06:07:06Z)
• Dynamical solitons and boson fractionalization in cold-atom topological insulators [110.83289076967895]
  We study the $mathbbZ$ Bose-Hubbard model at incommensurate densities. We show how defects in the $mathbbZ$ field can appear in the ground state, connecting different sectors. Using a pumping argument, we show that it survives also for finite interactions.
  arXiv  Detail & Related papers  (2020-03-24T17:31:34Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.