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In summer 2010, I supervised three

CAREER: Integrated Research and Education to Probe Coherent and Quantum States in the Presence of Strong Spin- Orbit Coupling Giti Khodaparast, Virginia Polytech Institute and State University DMR 0846834.

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In summer 2010, I supervised three

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  1. CAREER: Integrated Research and Education to Probe Coherent and Quantum States in the Presence of Strong Spin- Orbit CouplingGiti Khodaparast, Virginia Polytech Institute and State University DMR 0846834 Heterostructures with parabolic confinements are interesting systems to study for many reasons. In a perfect Parabolic Quantum Well (PQW), the subbands are equally spaced and electron-electron interactions are virtually non-existent, allowing coupling of long-wavelength radiation only to the center-of-mass coordinate of the electron system. An important parameter for enabling many-body effects is a large rs~m*/ε, the mean electron spacing divided by the effective Bohr radius. Due to smaller effective mass and larger dielectric constant, NGS such as InSb (m*=0.0147mo, ε =17.7εo) has a smaller rs compared to GaAs-based systems (m*=0.067mo, ε =13εo). In this aspect, probing NGSs such as InSb based heterostructures can provide a play ground to test several theoretical predictions and device schemes. As the switching rates in electronic and optoelectronic devices are pushed to higher frequencies, it is crucial to probe carrier dynamics on femtosecond time-scales. Here we present Two-color Differential Transmission measurements at 290 K in InSb based PQW. The pump excitation was fixed at 800 nm and the probe was tuned to the vicinity of an interband transition. Understanding the carrier cooling in this material system can be important to develop THz devices on the basis of PQW. The combination of designability in transition frequency, temperature stability, and narrow-band emission makes these structures important for device applications.

  2. CAREER: Integrated Research and Education to Probe Coherent and Quantum States in the Presence of Strong Spin- Orbit CouplingGiti Khodaparast, Virginia Polytech Institute and State University DMR 0846834 Lectures on several modern topics in physics, at the Roanoke Valley Governor’s school. Students from several remote districts attend this school to take their math and science classes. The lectures were presented monthly in the senior physics class in collaboration with Mr. Hoffman, the physics instructor. In summer 2010, I supervised three undergraduate students. Their activities were partially supported By the REU supplement. Jonathan Cates, Thomas Howe, and Armando Garcia were involved in several magneto-transport measurements. Armando joint my group from University of Texas in El Paso. Armando: taking magneto-transport data in the lab.

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