Research


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)

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

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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)

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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)

Jihee_SF

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)

Xiaowei_pn

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)

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

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

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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.