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Wednesday, August 13 • 10:20 - 12:20
Optical Properties of Heterostructures I

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10:20-10:50

Invited: Michael E. Flatté
Spin-Orbit Induced Circulating Currents in a Semiconductor Nanostructure
Co-authors: Joost van Bree, Andrei Silov, Paul Koenraad

Spin-correlated orbital currents dramatically modify the magnetic moment of an electron spin in many semiconductors, often enhancing the moment by an order of magnitude over its free-electron value. This modified magnetic moment is parametrized as a shape, size and composition dependent g tensor. Despite the central nature of g tensors to high-speed spin manipulation, spin lifetimes, and quantum computation, the spatial structure of the spin-correlated orbital currents that determine these g tensors has not been investigated. The most natural assumption, that the moment's value at a position in space is proportional to the probability density of the spin, is incorrect. Here we describe calculations of the spatial distribution of spin-correlated orbital currents for electron spin states of a quantum dot, and show that itinerant currents are extended throughout the quantum dot, peaking about midway out from the center of the dot. The electronic states are obtained within an analytically-solvable envelope-function formalism, and the magnetic moment is primarily due to itinerant currents originating from coherent superpositions of conduction and valence envelope functions, rather than from magnetic moments associated with the Wannier functions of each unit cell. For example, the spin of a quantum dot with g=0 will still evince a local magnetic moment that could interact with nearby localized magnetic systems.

10:50-11:05
Oral: Marc-Andre Dupertuis
Symmetries & Optical Transitions of Hexagonal Quantum Dots in GaAs/AlGaAs Nanowires
Co-authors: Guro Kristin Svendsen, Johannes Skaar, Helge Weman

11:05-11:20
Oral: A.R. Goni
Using High Pressure to Unravel the Mechanism of Visible Emission in Amorphous Si/SiOx Nanoparticles
Co-authors: Daiki Sodeoka, Hideki Kuruma, Masahiro Yoshimoto, María Isabel Alonso, Miquel Garriga, Alejandro R. Goni

11:20-11:35
Oral: Hubert Krenner
Full Acoustic Control of Quantum Dot-Like Emission Centers in GaAs/AlGaAs Radial Heterostructure Nanowires
Co-authors: Matthias Weiss, Jörg Kinzel, Florian Schülein, Daniel Rudolph, Jonathan Finley, Gerhard Abstreiter, Gregor Koblmüller, Achim Wixforth

11:35-11:50
Oral: Paulina Plochocka
Unintentional p-type Doping of a GaAs/AlAs Core-Multi-Shell Nanowire Revealed by Resonant Phonon Coupling
Co-authors: Joanna Jadczak, Anatolie Mitioglu, Ivan Breslavetz, Miquel Royo, Andrea Bertoni, Guido Goldoni, Tomasz Smolenski, Piotr Kossacki, Andrey Kretinin, Hadas Shtrikman, Duncan Maude

11:50-12:05
Oral: Malgorzata Szymura
Zeeman Splitting Anisotropy in CdMnTe Quantum Dots Embedded in ZnTe Nanowires
Co-authors: Łukasz Kłopotowski, Piotr Wojnar, Mateusz Goryca, Piotr Kossacki, Wojciech Zaleszczyk, Grzegorz Karczewski, Tomasz Wojtowicz, Jacek Kossut

12:05-12:20
Oral: B. D. McCombe
Effect of Location of Manganese Ions on Magnetic Polaron Properties in ZnTe/ZnSe Based Quantum Dot Structures 
Co-authors: B. Barman, J. R. Murphy, Y. TsaiT. Scrace, J. M. Pientka, A.N. Cartwright, I. Zutic, A. Petrou, W-C Chou, M-H Tsou, C-S Yang, I. R. Sellers, R. Oszwaldowski, A. G. Petukhov 

Session Chairs
UG

Ulf Gennser

Laboratoire de Photonique et de Nanastructures, CNRS
Ulf Gennser recieved his Ph.D. in 1992 from Columbia University (New York), working on resoant tunneling in SiGe heterostructures. He is currently the group leader of « Physics and Technology of Nanostructures » at the Laboratoire de Photonique et de Nanostructures, CNRS, France, and responsible for the molecular beam epitaxy of high mobility electronic systems. His main interest is in mesoscopic physics, and currently, among other... Read More →

Speakers
ME

Michael E. Flatté

Professor, University of Iowa
Michael E. Flatté is an expert in condensed matter and materials theory, specializing in carrier and spin dynamics and their applications to novel semiconductor devices. His research foci include semiconductor spintronics, solid-state quantum computation, carrier dynamics in semiconductor nanostructures, and nanoparticle dynamics in heterogeneous liquids. He has over 135 publications as well as 12 review articles/book chapters, 4... Read More →


Wednesday August 13, 2014 10:20 - 12:20
Room 16A

Attendees (14)