TITLE

Experimental tests of effective mass and atomistic approaches to quantum dot electronic structure: Ordering of electronic states

AUTHOR(S)
Sewall, Samuel L.; Cooney, Ryan R.; Kambhampati, Patanjali
PUB. DATE
June 2009
SOURCE
Applied Physics Letters;6/15/2009, Vol. 94 Issue 24, p243116
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The overall symmetry of the envelope functions for the four lowest energy excitonic states in colloidal CdSe quantum dots are assigned using excitonic state-resolved pump/probe spectroscopy. These experiments yield a direct test of the two prevailing approaches to quantum dot electronic structure: the effective mass and the atomistic approaches. The experimental results are in complete agreement with the atomistic approach, whereas the effective mass approach fails to assign the correct electron symmetries for higher excitonic states.
ACCESSION #
42223710

 

Related Articles

  • Empirical pseudo-potential studies on electronic structure of semiconducting quantum dots. Kshirsagar, Anjali; Kumbhojkar, Neelesh // Bulletin of Materials Science;2008, Vol. 31 Issue 3, p297 

    Theoretical investigations of electronic structure of quantum dots is of current interest in nanophase materials. Empirical theories such as effective mass approximation, tight binding methods and empirical pseudo-potential method are capable of explaining the experimentally observed optical...

  • Energy levels in self-assembled quantum arbitrarily shaped dots. Tablero, C. // Journal of Chemical Physics;2/8/2005, Vol. 122 Issue 6, pN.PAG 

    A model to determine the electronic structure of self-assembled quantum arbitrarily shaped dots is applied. This model is based principally on constant effective mass and constant potentials of the barrier and quantum dot material. An analysis of the different parameters of this model is done...

  • Electron capture cross sections of InAs/GaAs quantum dots. Engström, O.; Kaniewska, M.; Fu, Y.; Piscator, J.; Malmkvist, M. // Applied Physics Letters;10/4/2004, Vol. 85 Issue 14, p2908 

    By measuring the thermal emission rates of electrons from InAs/GaAs quantum dots, capture cross sections in the extremely high region of 10-11–10-10 cm2 have been found. These data have been confirmed by using an additional method based on a static measurement at thermal equilibrium,...

  • Comparative study for colloidal quantum dot conduction band state calculations. Jun-Wei Luo; Shu-Shen Li; Jian-Bai Xia; Lin-Wang Wang // Applied Physics Letters;4/3/2006, Vol. 88 Issue 14, p143108 

    By comparing the results of some well-controlled calculation methods, we analyze the relative importance of bulk band structure, multi-bulk-band coupling, and boundary conditions in determining colloidal quantum dot conduction band eigenenergies. We find that while the bulk band structure and...

  • Fast tunnel rates in Si/SiGe one-electron single and double quantum dots. Thalakulam, Madhu; Simmons, C. B.; Rosemeyer, B. M.; Savage, D. E.; Lagally, M. G.; Friesen, Mark; Coppersmith, S. N.; Eriksson, M. A. // Applied Physics Letters;5/3/2010, Vol. 96 Issue 18, p183104 

    We report the fabrication and measurement of one-electron single and double quantum dots with fast tunnel rates in a Si/SiGe heterostructure. Achieving fast tunnel rates in few-electron dots can be challenging, in part due to the large electron effective mass in Si. Using charge sensing, we...

  • Electron transport through hierarchical self-assembly of GaAs/AlxGa1-xAs quantum dots. Shu-Shen Li; Jian-Bai Xia; Hirose, Kenji // Journal of Applied Physics;10/15/2005, Vol. 98 Issue 8, p083704 

    The transmission of electrons through a hierarchical self-assembly of GaAs/AlxGa1-xAs quantum dots (QDs) is calculated using the coupled-channel recursion method. Our results reveal that the number of conductance peaks does not change when the barrier widths change, but the intensities decrease...

  • Interband optical transitions in spherical nanoheterostructures. Boichuk, V. I.; Bilynskyi, I. V.; Shakleina, I. O. // Semiconductor Physics, Quantum Electronics & Optoelectronics;2005, Vol. 8 Issue 4, p26 

    A spherical semiconductor nanoheterostructure of cubic symmetry is studied in the paper. Accurate solutions of the Schrödinger equation for S #x00BD;, P½, P3/2, D5/2, and D7/2 states of particles are found in the framework of the Luttinger-Baldereschi-Lipari Hamiltonian and the finite...

  • Parabolic band approximation of the electron energy levels in a tetrahedral-shaped quantum dot. Pengpan, Teparksorn; Daengngam, Chalongrat // Canadian Journal of Physics;Nov2008, Vol. 86 Issue 11, p1327 

    In more elaborate schemes, an electron’s effective mass in a heterostructure semiconductor quantum dot (QD) depends on both its position and its energy. However, the electron’s effective mass can be simply modeled by a parabolic band approximation — the electron’s...

  • Effect of size non-uniformity on photoluminescence from ensembles of InAs quantum dots embedded in GaAs. Naiyun Tang // Journal of Materials Science;Aug2007, Vol. 42 Issue 16, p6913 

    The photoluminescence (PL) spectrum from ensembles of InAs/GaAs quantum dots (QDs) is calculated. The effect of the dot size distribution and the variation of the associated confining potentials on the PL spectra are estimated. It is found that the intermixing of the interfaces causes an...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics