Sam Carter

Three-Pulse Echo Peak Shift Spectroscopy of Disordered Semiconductor Quantum Wells and Dense Atomic Vapors

Three-pulse echo peak shift spectroscopy yields the correlation function of the frequency fluctuations due to acoustic phonons for excitons in disordered semiconductor quantum wells and fluctuations due to atomic motion in a potassium vapor.

Effects of disorder on electron spin dynamics in GaAs quantum wells

We measure electron spin dynamics in GaAs quantum wells with varying electron density. Electron Landé g factor is measured to characterize disorder potential. Electron spin coherence is lost from interplay between localization and dynamical scattering.

Echo peak shift spectroscopy of quantum well excitons

Three-pulse four-wave-mixing is used to observe the loss of optical phase memory in an inhomogeneous quantum well. The system¿s ability to form a photon echo is almost entirely lost due to spectral diffusion of excitons.

Transient spin-gratings of itinerant electrons in lightly-doped GaAs quantum wells

Spin gratings lasting longer than the carrier lifetime are measured in lightly n-doped quantum wells. In a magnetic field, precession of the grating is observed, and diffusion rates are determined by varying the grating period.

Spin Dynamics in n-doped CdTe quantum wells: Interplay of excitons, trions and two-dimensional electron gas

Spectral study of Kerr rotation is performed for quantum wells with different doping. Lightly doped sample shows excitonic enhancement of electron spin polarization. The presence of holes enhances electron spin relaxation in highly doped samples.