Coherent Optical Spectroscopy of a Strongly Driven Quantum Dot
Abstract
Quantum dots are typically formed from large groupings of atoms and thus may be expected to have appreciable many-body behavior under intense optical excitation. Nonetheless, they are known to exhibit discrete energy levels due to quantum confinement effects. We show that, like single-atom or single-molecule two- and three-level quantum systems, single semiconductor quantum dots can also exhibit interference phenomena when driven simultaneously by two optical fields. Probe absorption spectra are obtained that exhibit Autler-Townes splitting when the optical fields drive coupled transitions and complex Mollow-related structure, including gain without population inversion, when they drive the same transition. Our results open the way for the demonstration of numerous quantum level–based applications, such as quantum dot lasers, optical modulators, and quantum logic devices.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Aug 17, 2007
- Source ID
- 10.1126/science.1142979
Entities
People
- Allan S. Bracker
- Bo Sun
- Dan Gammon
- Duncan G. Steel
- Lu Jeu Sham
- P. R. Berman
- Xiaodong Xu
Organizations
- United States Naval Research Laboratory
- University of California, San Diego
- University of Michigan