Using Optical Pump-THz Probe Magneto-spectroscopy

THz spectroscopy is a method that can be used to study transitional metal dichalcogenide material systems on ultrafast time scales by determining the quantum effect of emitted THz radiation and phase on the material under extreme conditions.¹ Monolayer molybdenum disulfide (MoS₂) has been broadly studied and displays electron-phonon interactions and exciton-exciton scattering that influence the coherence time and often are the driving component for the application of this material.² These measurements were performed on bulk MoS₂, using an optical pump-terahertz probe spectrometer that operated under high magnetic fields (< 25 T) at the National High Magnetic Field Laboratory in Tallahassee, Florida. The response of this material was measured under different constant magnetic fields using an air-biased coherent detection system (ABCD) by tracing optical pump delays while sitting at the peak of the transmitted THz pulse.

[1] J. A. Curtis, A. D. Burch, et al, “Broad-band ultrafast terahertz spectroscopy in the 25 T Split Florida-Helix,” Review of Scientific Instruments 89, 073901 (2018).
[2] P. Dey, J. Paul, et al., “Optical Coherence in Atomic-Monolayer Transition-Metal Dichalcogenides Limited by Electron-Phonon Interactions,” Physical Review Letters 116, 127402 (2016).