Electrically tunable multi-terminal SQUID-on-tip

Abstract

We present a new nanoscale superconducting quantum interference device (SQUID) whose interference pattern can be shifted electrically in-situ. The device consists of a nanoscale four-terminal/four-junction SQUID fabricated at the apex of a sharp pipette using a self-aligned three-step deposition of Pb. In contrast to conventional two-terminal/two-junction SQUIDs that display optimal sensitivity when flux biased to about a quarter of the flux quantum, the additional terminals and junctions allow optimal sensitivity at arbitrary applied flux, thus eliminating the magnetic field "blind spots". We demonstrate spin sensitivity of 5 to 8 ${\mu }_B/{\text{Hz}}^{1/2}$ over a continuous field range of 0 to 0.5 T, with promising applications for nanoscale scanning magnetic imaging.

References in corpus (12)

• Nanoscale magnetic imaging of a single electron spin under ambient conditions
• Quantitative nanoscale vortex-imaging using a cryogenic quantum magnetometer
• Mechanics of Individual, Isolated Vortices in a Cuprate Superconductor
• Force-detected nuclear magnetic resonance: Recent advances and future challenges
• Non-sinusoidal current-phase relationship in Josephson junctions from the 3D topological insulator HgTe
• Mechanical control of individual superconducting vortices
• A Terraced Scanning Superconducting Quantum Interference Device Susceptometer with Sub-Micron Pickup Loops
• A three-junction SQUID-on-tip with tunable in-plane and out-of-plane magnetic field sensitivity
• Optimizing the spin sensitivity of grain boundary junction nanoSQUIDs -- towards detection of small spin systems with single-spin resolution
• Electric coupling in scanning SQUID measurements
• MicroSQUID Force microscopy in a dilution refrigerator
• Multi-terminal multi-junction dc SQUID for nanoscale magnetometry

Cited by in corpus (17)

• Symmetry breaking and skyrmionic transport in twisted bilayer graphene
• Field-Effect Controllable Metallic Josephson Interferometer
• SQUID-on-tip with single-electron spin sensitivity for high-field and ultra-low temperature nanomagnetic imaging
• Non-Reciprocal Supercurrents in a Field-Free Graphene Josephson Triode
• pyTDGL: Time-dependent Ginzburg-Landau in Python
• Direct reconstruction of two-dimensional currents in thin films from magnetic field measurements
• Planar Superconductor-Ferromagnet-Superconductor Josephson junctions as scanning probe sensors
• Josephson junctions in a local inhomogeneous magnetic field
• Sputtered MoRe SQUID-on-tip for high-field magnetic and thermal nanoimaging
• Miniaturization of the Superconducting Memory Cell via a Three-Dimensional Nb Nano-Superconducting Quantum Interference Device
• Scanning SQUID-on-tip microscope in a top-loading cryogen-free dilution refrigerator
• Spontaneous vortex-antivortex lattice and Majorana fermions in rhombohedral graphene
• Superconducting nanoribbon with a constriction: A quantum-confined Josephson junction
• Local tuning of the order parameter in superconducting weak links: A zero-inductance nano device
• Advanced SQUID-on-lever scanning probe for high-sensitivity magnetic microscopy with sub-100-nm spatial resolution
• Holographic reconstruction of magnetic field distribution in a Josephson junction from diffraction-like Ic(H) patterns
• Enhanced Phonon-Assisted Tunneling in Metal -- Twisted Bilayer Graphene Junctions