High sensitivity cantilevers for measuring persistent currents in normal metal rings

Abstract

We propose a new approach to measuring persistent currents in normal metal rings. By integrating micron-scale metal rings into sensitive micromechanical cantilevers and using the cantilevers as torque magnetometers, it should be possible to measure the rings' persistent currents with greater sensitivity than the SQUID-based and microwave resonator-based detectors used in the past. In addition, cantilever-based detectors may allow for measurements in a cleaner electromagnetic environment. We have fabricated ultra sensitive cantilevers with integrated rings and measured their mechanical properties. We present an estimate of the persistent current sensitivity of these cantilever-based detectors, focusing on the limits set by the cantilever's Brownian motion and the shot noise in the laser interferometer that monitors the cantilever.

References in corpus (7)

• Observation of Persistent Currents in Mesoscopic Connected Rings
• Dynamic response of isolated Aharonov-Bohm rings coupled to an electromagnetic resonator
• Diamagnetic orbital response of mesoscopic silver rings
• Entanglement and Criticality in Quantum Impurity Systems
• Noise thermometry and electron thermometry of a sample-on-cantilever system below 1 Kelvin
• Persistent current induced by magnetic impurities
• Damping of micromechanical structures by paramagnetic relaxation

Cited by in corpus (7)

• Measurement of the full distribution of the persistent current in normal-metal rings
• Mesoscopic persistent currents in a strong magnetic field
• Charge and spin polarized currents in mesoscopic rings with Rashba spin-orbit interactions coupled to an electron reservoir
• Random-matrix modeling of semi-linear response, the generalized variable range hopping picture, and the conductance of mesoscopic rings
• Charge Fractionalization in a Mesoscopic Ring
• Quantum dynamics and transport in a double well system
• Fabrication and characterization of large arrays of mesoscopic gold rings on large-aspect-ratio cantilevers