1347A, Engineering II
Santa Barbara, CA 93106
Tel: (805) 893-8256
Fax: (805) 893-8502
group is involved in research on self-assembled nanostructures
using molecular beam epitaxy. We work on self-assembled quantum
wires and quantum dots in III-V compounds semiconductors. Students
and postdoctoral researchers are using both epitaxial growth and
spectroscopy techniques to understand the physical properties associated
with two or three dimensional carrier confinement in these nano
structures. The work on self-assembled quantum dots is also focused
on developing novel devices, which use the unique physical properties
of the quantum dots. The "atom like" properties of quantum
dots make them a potential candidate for quantum gates to be used
in quantum computing. Spin injection in quantum dots using hybrid
magnetic-semiconductor structures is becoming a major topic of research
in the group.
the topics under investigation are:
and spectroscopy of self assembled quantum dots and quantum
of tunable quantum dot molecules
dot optical memory in the GaN system
dot infrared detectors
magnetic-semiconductor structures have become a major topic
of research in the group. Molecular beam epitaxy of the Fe-GaAs-InAs
system and the GaMnAs-GaAs -InAs system has been developed with
a focus on novel spintronic device applications. A quantum dot spin
LED which shows polarized spin injection through its magnetically
dependent electroluminescence has been developed. The physics of
spin injection in quantum dots is under investigation using this
a new effort on developing the grapho-epitaxy of conducting and
magnetic polymers has been started in our group with the collaboration
of professor E.Kramer of the polymer group. Here we use the ultra
small (nanosize) patterning of a surface to force the molecular
crystals to all grow with the same orientation.
F.G.Pikus, P.M.Petroff, A.L.Efros. "Single electron charging
and Coulomb interactions in InAs self assembled quantum dot arrays",
Phys. Rev. B 55(3), 1568 (1997).
P.J., Garcia, J.M.; Feng, J.-L., Petroff, P.M. "Giant magnetoresistance
in a low-temperature GaAs/MnAs nanoscale ferromagnet hybrid structure",
Applied Physics Letters 73(22), 329 (1998).
G.Medeiros Ribeiro, P.M.Petroff, "Photoluminescence of charged
InAs self assembled quantum dots" Phys. Rev B 7(58),
T. Lundstrom, W. Schoenfeld, H. Lee, P.M. Petroff, "Exciton
strorage in Semiconductor Self-Assembled Quantum Dots." Science
286, 2312-2314 (1999).
Paskov, P.O. Holtz, B. Monemar, J.M. Garcia, W.V. Schoenfeld,
P.M. Petroff "Photoluminescence up-conversion in InAs/GaAs
self-assembled quantum dots" Applied Physics Letters 77(6),
W.V., Metzner, C.; Letts, E., Petroff, P.M., "Spectroscopy
of strain-induced quantum dots in GaAs/Al/sub x/Ga/sub 1-x/As
quantum well structures", Physical Review B 63(20),
Lee, J.A. Johnson, M.Y. He, J.S. Speck, P.M. Petroff, "Strain
engineered self-assembled semiconductor quantum dot lattices",
Applied Physics Letters 78(1),105 (2001).
A/Lorke, A.Imamoglu, "Epitaxial self Assembled Quantum Dots",
Physics Today 46 ( 2001).