Instrumentation for Millimeter-wave Magnetoelectrodynamic Investigations of Low-Dimensional Conductors and Superconductors

TL;DR

This paper presents a high-sensitivity millimeter-wave measurement system capable of probing low-dimensional conductors and superconductors under strong magnetic fields, enabling detailed studies of their electromagnetic properties.

Contribution

The paper introduces a novel instrumentation setup using a Millimeter-wave Vector Network Analyzer for broad frequency, high-field, and rapid measurements of low-dimensional materials.

Findings

Demonstrated capability to measure complex cavity parameters at 10 kHz

Achieved measurements over 40-200 GHz range in high magnetic fields

Validated the system with experimental studies of low-dimensional conductors

Abstract

We describe instrumentation for conducting high sensitivity millimeter-wave cavity perturbation measurements over a broad frequency range (40-200 GHz) and in the presence of strong magnetic fields (up to 33 tesla). A Millimeter-wave Vector Network Analyzer (MVNA) acts as a continuously tunable microwave source and phase sensitive detector (8-350 GHz), enabling simultaneous measurements of the complex cavity parameters (resonance frequency and Q-value) at a rapid repetition rate (approx. 10 kHz). We discuss the principal of operation of the MVNA and the construction of a probe for coupling the MVNA to various cylindrical resonator configurations which can easily be inserted into a high field magnet cryostat. We also present several experimental results which demonstrate the potential of the instrument for studies of low-dimensional conducting systems.