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Magnetically Tuned Continuous Transition from Weak to Strong Coupling in Terahertz Magnon Polaritons
Andrey Baydin, Kenji Hayashida, Takuma Makihara +11
Depending on the relative rates of coupling and dissipation, a light-matter coupled system is either in the weak- or strong-coupling regime. Here, we present a unique system where…
Chiral Phonons with Giant Magnetic Moments in a Topological Crystalline Insulator
Felix G. G. Hernandez, Andrey Baydin, Swati Chaudhary +10
We have studied the magnetic response of transverse optical phonons in PbSnTe films. Polarization-dependent terahertz magnetospectroscopy measurements revealed Zeeman…
Evidence for Phonon-Assisted Intertube Electronic Transport in an Armchair Carbon Nanotube Film
Davoud Adinehloo, Weilu Gao, Ali Mojibpour +2
The electrical conductivity of a macroscopic assembly of nanomaterials is determined through a complex interplay of electronic transport within and between constituent nano-objects…
Band Structure Dependent Electronic Localization in Macroscopic Films of Single-Chirality Single-Wall Carbon Nanotubes
Weilu Gao, Davoud Adinehloo, Ali Mojibpour +7
Significant understanding has been achieved over the last few decades regarding chirality-dependent properties of single-wall carbon nanotubes (SWCNTs), primarily through single-tu…
Terahertz Faraday and Kerr rotation spectroscopy of BiSb films in high magnetic fields up to 30 Tesla
Xinwei Li, Katsumasa Yoshioka, Ming Xie +16
We report results of terahertz Faraday and Kerr rotation spectroscopy measurements on thin films of , an alloy system that exhibits a semimetal-to-top…
Terahertz Strong-Field Physics without a Strong External Terahertz Field
Motoaki Bamba, Xinwei Li, Junichiro Kono
Traditionally, strong-field physics explores phenomena in matter (atoms, molecules, and solids) driven by an extremely strong laser field nonperturbatively. However, even in the co…
Science and applications of wafer-scale crystalline carbon nanotube films prepared through controlled vacuum filtration
Weilu Gao, Junichiro Kono
Carbon nanotubes (CNTs) make an ideal one-dimensional (1D) material platform for the exploration of exotic physical phenomena under extremely strong quantum confinement. The 1D cha…
Direct Observation of Cross-Polarized Excitons in Aligned Single-Chirality Single-Wall Carbon Nanotubes
Fumiya Katsutani, Weilu Gao, Xinwei Li +4
Optical properties of single-wall carbon nanotubes (SWCNTs) for light polarized parallel to the nanotube axis have been extensively studied, whereas their response to light polariz…
Magneto-Optics of Exciton Rydberg States in a Monolayer Semiconductor
Andreas V. Stier, Nathan P. Wilson, Kirill A. Velizhanin +3
We report 65 tesla magneto-absorption spectroscopy of exciton Rydberg states in the archetypal monolayer semiconductor WSe. The strongly field-dependent and distinct energy shi…
Magneto-reflection spectroscopy of monolayer transition-metal dichalcogenide semiconductors in pulsed magnetic fields
Andreas V. Stier, Kathleen M. McCreary, Berend T. Jonker +2
We describe recent experimental efforts to perform polarization-resolved optical spectroscopy of monolayer transition-metal dichalcogenide semiconductors in very large pulsed magne…
Exciton Diamagnetic Shifts and Valley Zeeman Effects in Monolayer WS and MoS to 65 Tesla
Andreas V. Stier, Kathleen M. McCreary, Berend T. Jonker +2
We report circularly-polarized optical reflection spectroscopy of monolayer WS and MoS at low temperatures (4~K) and in high magnetic fields to 65~T. Both the A and the B e…
Gate-Tuned Spontaneous Exciton Insulator in Double-Quantum Wells
Lingjie Du, Wenkai Lou, Kai Chang +2
It was proposed that a dilute semimetal is unstable against the formation of an exciton insulator, however experimental confirmations have remained elusive. We investigate the orig…
Superradiant Decay of Cyclotron Resonance of Two-Dimensional Electron Gases
Qi Zhang, Takashi Arikawa, Eiji Kato +9
We report on the observation of collective radiative decay, or superradiance, of cyclotron resonance (CR) in high-mobility two-dimensional electron gases in GaAs quantum wells usin…
Ultrafast Generation of Fundamental and Multiple-order Phonon Excitations in Highly-Enriched (6,5) Single-Wall Carbon Nanotubes
Y. -S. Lim, A. R. T. Nugraha, S. -J. Cho +14
Using a macroscopic ensemble of highly-enriched (6,5) single-wall carbon nanotubes, combined with high signal-to-noise ratio, time-dependent differential transmission spectroscopy,…
Fermi-Edge Superfluorescence from a Quantum-Degenerate Electron-Hole Gas
J. -H. Kim, G. T. Noe, S. A. McGill +4
We report on the observation of spontaneous bursts of coherent radiation from a quantum-degenerate gas of nonequilibrium electron-hole pairs in semiconductor quantum wells. Unlike…
Plasmonic Nature of the Terahertz Conductivity Peak in Single-Wall Carbon Nanotubes
Q. Zhang, E. H. Haroz, Z. Jin +5
Plasmon resonance is expected to occur in metallic and doped semiconducting carbon nanotubes in the terahertz frequency range, but its convincing identification has so far been elu…
Terahertz Science and Technology of Carbon Nanomaterials
R. R. Hartmann, J. Kono, M. E. Portnoi
The diverse applications of terahertz radiation and its importance to fundamental science makes finding ways to generate, manipulate, and detect terahertz radiation one of the key…
A table-top, repetitive pulsed magnet for nonlinear and ultrafast spectroscopy in high magnetic fields up to 30 T
G. Timothy Noe, Hiroyuki Nojiri, Joseph Lee +3
We have developed a mini-coil pulsed magnet system with direct optical access, ideally suited for nonlinear and ultrafast spectroscopy studies of materials in high magnetic fields…
Effects of Electron-Electron Interactions on Electronic Raman Scattering of Graphite in High Magnetic Fields
Y. Ma, Y. Kim, N. G. Kalugin +5
We report the observation of strongly temperature-dependent, asymmetric spectral lines in electronic Raman scattering spectra of graphite in a high magnetic field up to 45 T applie…
Measurement of Filling-Factor-Dependent Magnetophonon Resonances in Graphene Using Raman Spectroscopy
Y. Kim, J. M. Poumirol, A. Lombardo +9
We perform polarization-resolved Raman spectroscopy on graphene in magnetic fields up to 45T. This reveals a filling-factor-dependent, multi-component anticrossing structure of the…
Fundamental Optical Processes in Armchair Carbon Nanotubes
E. H. Haroz, J. G. Duque, X. Tu +5
We have used post-synthesis separation methods based on density gradient ultracentrifugation and DNA-based ion-exchange chromatography to produce aqueous suspensions strongly enric…
Terahertz Dynamics of Quantum-Confined Electrons in Carbon Nanomaterials
L. Ren, Q. Zhang, S. Nanot +3
Low-dimensional carbon nanostructures, such as single-wall carbon nanotubes (SWCNTs) and graphene, offer new opportunities for terahertz science and technology. Being zero-gap syst…
Terahertz and Infrared Spectroscopy of Gated Large-Area Graphene
Lei Ren, Qi Zhang, Jun Yao +9
We have fabricated a centimeter-size single-layer graphene device, with a gate electrode, which can modulate the transmission of terahertz and infrared waves. Using time-domain ter…
Observation of Coulomb-Assisted Dipole-Forbidden Intraexciton Transitions in Semiconductors
W. D. Rice, J. Kono, S. Zybell +14
We use terahertz pulses to induce resonant transitions between the eigenstates of optically generated exciton populations in a high-quality semiconductor quantum-well sample. Monit…