A Platform for Far-Infrared Spectroscopy of Quantum Materials at Millikelvin Temperatures
arXiv:2308.00610 · doi:10.1063/5.0160321
Abstract
Optical spectroscopy of quantum materials at ultralow temperatures is rarely explored, yet it may provide critical characterizations of quantum phases not possible using other approaches. We describe the development of a novel experimental platform that enables optical spectroscopic studies, together with standard electronic transport, of materials at millikelvin temperatures inside a dilution refrigerator. The instrument is capable of measuring both bulk crystals and micron-sized two-dimensional van der Waals materials and devices. We demonstrate the performance by implementing photocurrent-based Fourier transform infrared spectroscopy on a monolayer WTe device and a multilayer 1T-TaS crystal, with a spectral range available from the near-infrared to the terahertz regime and in magnetic fields up to 5 T. In the far-infrared regime, we achieve spectroscopic measurements at a base temperature as low as ~ 43 mK and a sample electron temperature of ~ 450 mK. Possible experiments and potential future upgrades of this versatile instrumental platform are envisioned.
arXiv comment14 pages, 6 figures, typos corrected
References in corpus (17)
- Observation of the Quantum Spin Hall Effect up to 100 Kelvin in a Monolayer Crystal
- Electrically Tunable Low Density Superconductivity in a Monolayer Topological Insulator
- Gate-induced superconductivity in a monolayer topological insulator
- Geometrical Description of the Fractional Quantum Hall Effect
- Is 1T-TaS a 40 year old quantum spin liquid?
- Observation of Wigner crystal of electrons in a monolayer semiconductor
- Photocurrent as a multi-physics diagnostic of quantum materials
- Evidence for equilibrium excitons and exciton condensation in monolayer WTe2
- Spinon Fermi surface in a cluster Mott insulator model on a triangular lattice and possible application to 1T-TaS
- Landau Quantization and Highly Mobile Fermions in an Insulator
- Chiral Gravitons in Fractional Quantum Hall Liquids
- Optical Probing of the Spin Polarization of the nu=5/2 Quantum Hall State
- Phonon anomaly at the charge ordering transition in 1T-TaS2
- Mechanisms for Sub-Gap Optical Conductivity in Herbertsmithite
- Neutral Excitations of Quantum Hall States: a Density Matrix Renormalization Group Study
- Cyclotron resonance inside the Mott gap: a fingerprint of emergent neutral fermions
- Dynamic ordering transitions in charged solid