e-mail: mgrayson@alumni.princeton.edu

Office: (301) 405-6162

Lab:    (301) 405-7278

FAX:  (301) 314-9465

Address: Department of Physics, University of Maryland, College Park, MD 20742

Research Associate in the Department of Physics at the University of Maryland

B.S.  University of Notre Dame, Electrical Engineering, 1990
Ph.D. Princeton University, Electrical Engineering, 1998
            Thesis:  Tunneling into the edge of a two-dimensional electron system
            Advisor:  Prof. Dan Tsui

Research Project: Far-infrared Faraday rotation spectroscopy of YBCO

Project Overview: We measure the Hall angle, q_H, in YBCO films in the far- and mid-infrared to determine the temperature and frequency dependence of the Hall scattering.  Using novel modulation techniques we measure both the Faraday rotation and ellipticity induced by these films in high magnetic fields to deduce the complex conductivity tensor. We observe a strong temperature dependence of the mid-infrared Hall conductivity in sharp contrast to the weak dependence of the longitudinal conductivity. By fitting the frequency dependent normal state Hall angle to a Lorentzian q_H (w) = w_H / (g_H - i w) we find the Hall frequency, w_H, is nearly independent of temperature.  The Hall scattering rate, g_H, is consistent with g_H ~ T² up to 200 K and is remarkably independent of IR frequency suggesting non-Fermi liquid behavior.

Reprint: Far-infrared Hall effect in YBCO:  Temperature and frequency dependence of Hall scattering (.pdf)
Preprint: Resonant tunneling into a biased fractional quantum Hall edge (.ps) (Fig.1.ps)(Fig.2.ps)(Fig.3.ps)

Collaborators:
Prof. H. Dennis Drew
Dr. John Cerne
Don Schmadel
Leila Vale
 

Last Modified: January 4, 2001