Many-Body Interactions in Semiconductors Probed by Optical Two-Dimensional Fourier Transform Spectroscopy
X Li, T Zhang, C N. Borca, Steven T. Cundiff
Understanding many body interactions is a universal challenge in physics that is best approached by studying carefully chosen model systems. One ideal system for such investigations is an optically excited semiconductor, particularly excitons. We advance the understanding of many body interactions among excitons in semiconductors by applying the powerful technique of optical two dimensional Fourier transform spectroscopy. Correlating the phase evolution of the nonlinear polarization field during the initial evolution and the final detection period yields two dimensional spectra. The real part of the two dimensional specta provides unique line shapes that identify the microscopic origin of the many body interactions, which is confirmed by phenomenological calculations. The detailed information obtained from optical two dimensional Fourier transform spectroscopy will challenge first principle theorectical treatment of interacting excitons, thereby improving our understandig of many body physics.
Physical Review Letters
semiconductors, spectroscopy, two dimensional Fourier transform
, Zhang, T.
, Borca, C.
and Cundiff, S.
Many-Body Interactions in Semiconductors Probed by Optical Two-Dimensional Fourier Transform Spectroscopy, Physical Review Letters
(Accessed May 29, 2023)