TITLE

Confluence of resonant laser excitation and bidirectional quantum-dot nuclear-spin polarization

AUTHOR(S)
Latta, C.; Högele, A.; Zhao, Y.; Vamivakas, A. N.; Maletinsky, P.; Kroner, M.; Dreiser, J.; Carusotto, I.; Badolato, A.; Schuh, D.; Wegscheider, W.; Atature, M.; Imamoglu, A.
PUB. DATE
October 2009
SOURCE
Nature Physics;Oct2009, Vol. 5 Issue 10, p758
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Resonant laser scattering along with photon correlation measurements established the atom-like character of quantum dots. Here, we show that for a wide range of experimental parameters it is impossible to isolate elementary quantum-dot excitations from a strong influence of nuclear spins; the absorption lineshapes at magnetic fields exceeding 1 T indicate that the nuclear spins get polarized by an amount that ensures locking of the quantum-dot resonance to the incident laser frequency. In stark contrast to earlier experiments, this nuclear-spin polarization is bidirectional, allowing the combined electron–nuclear-spin system to track the changes in laser frequency dynamically on both sides of the resonance. This unexpected feature stems from a competition between two spin-pumping processes that attempt to polarize nuclear spins in opposite directions. We find that the confluence of laser excitation and nuclear-spin polarization suppresses the fluctuations in resonant absorption. A master-equation analysis suggests narrowing of the nuclear-spin distribution, pointing to applications in quantum information processing.
ACCESSION #
44414819

 

Related Articles

Share

Read the Article

Courtesy of VIRGINIA BEACH PUBLIC LIBRARY AND SYSTEM

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics