Solid State Spectroscopy: Fundamental Physics and Device Applications

Our group investigates condensed matter systems using state-of-the-art spectroscopic techniques to probe charge, spin, and vibrational dynamics. Our experimental facilities include the RAMBO system -- a unique mini-coil-based 30-T pulsed magnet system equipped with ultrafast and nononlinear optical spectroscopy setups. Some of our current interets include:

  • Optics and photonics of carbon nanotubes, graphene, and 2D materials
  • Physics and applications of terahertz phenomena
  • Spintronics, opto-spintronics, and optical quantum information processing
  • Nonlinear, ultrafast, and quantum optical phenomena in solids
  • Optical processes in ultrahigh magnetic fields

Results of our research will lead to an increased understanding of non-equilibrium many-body dynamics in condensed matter as well as development of novel opto-electronic devices.

Below are some recent highlights of our research. Please see the Publications page to see a full list of our publications.

Recent Research Highlights:

Q. Zhang et al., "Superradiant Decay of Cyclotron Resonance of Two-Dimensional Electron Gases," Physical Review Letters 113, 047601 (2014). (abstract, full text, arXiv)


X. He et al., "Carbon Nanotube Terahertz Detector," Nano Letters 14, 3953 (2014). (abstract, full text, Rice News)


Q. Zhang et al., "Plasmonic Nature of the Terahertz Conductivity Peak in Single-Wall Carbon Nanotubes," Nano Letters 13, 5991 (2013). (abstract, full text, Rice News)


J.-H. Kim, G. T. Noe II, et al., "Fermi-Edge Superfluorescence from a Quantum-Degenerate Electron-Hole Gas," Scientific Reports 3, 3283 (2013). (abstract, full text, Rice News)


X. He et al., "Photothermoelectric p-n Junction Photodetector with Intrinsic Broadband Polarimetry Based on Macroscopic Carbon Nanotube Films," ACS Nano 7, 7271 (2013). (abstract, full text, Rice News)


S. Nanot et al., "Broadband, Polarization-Sensitive Photodetector Based on Optically-Thick Films of Macroscopically Long, Dense, and Aligned Carbon Nanotubes," Scientific Reports 3, 1335 (2013). (abstract, full text, Rice News)


E. H. Hároz et al., "Fundamental Optical Processes in Armchair Carbon Nanotubes" (Feature Article), Nanoscale 5, 1411 (2013). (abstract, full text, Rice News)


J.-H. Kim et al., "Coherent Phonons in Carbon Nanotubes and Graphene" (Invited Review Article), Chemical Physics 413, 55 (2013). (abstract, full text)


Single-Wall Carbon Nanotube (SWCNT) Assignment Table:

Sivarajan Chart for the electronic assignment of single-wall carbon nanotubes (SWCNTs). Most experimental data is for SWCNTs suspended in SDS. Each colored square represents a particular (n,m) species identified by n (left axis) and m (bottom axis).  The color (yellow, green, and blue) of each square indicates its respective electronic type (medium-gap semiconductor, small-gap semiconductor, and metal).  For each (n,m) species, the radial breathing mode (RBM) frequency (in cm^{−1})  and E_{11} resonance wavelength (in nm) are indicated. For semiconducting [(nm) mod 3 = ±1] nanotubes, the E_{22} resonance wavelength (in nm) is also shown.  The red circle in the bottom left corner of some entries represents isoradial (n,m) pairs of identical diameters; the pairs are matched with the number “i” inside the red circle.  Values for E_{11} are taken from Ref. 1. Values for RBM frequency and E_{22} are taken Ref. 2.  Reproduced with permission, Copyright 2003, Ramesh Sivarajan. Updated by Erik H. Hároz on August 15, 2012.