Upcoming Colloquia

Nanocrystal Quantum Dots: Electronic Structures and Relaxation Pathways

Victor Klimov

Softmatter Nanotechnology and Advanced Spectroscopy,
Chemistry Division
Los Alamos National Laboratory,
Los Alamos, New Mexico 87545, USA

Monday, February 8, 10am

Chemistry Division Auditorium, TA-46, Bld. 535, Rm. 103

Abstract


Semiconductor nanocrystals are nanometer-size crystalline particles that contain approximately 100 to 10,000 atoms. Using chemical syntheses they can be fabricated with almost atomic precision as nearly spherical nanoparticles (quantum dots), elongated nano-sized crystals (quantum rods), or nanostructures of other more complex shapes such as tetrapods. The ability to precisely control the composition, size and shape of the nanocrystals provides great flexibility in engineering their electronic and optical properties by directly manipulating electronic wavefunctions. This lecture will provide an introduction into electronic and optical properties of nanocrystal quantum dots, including the structure of electronic states, optical absorption and emission spectra, and carrier relaxation and recombination pathways. It will also discuss the use of ultrafast spectroscopic methods for studies of electronic spectra and carrier dynamics in nanocrystals.