News Column

Findings in the Area of Quantum Dots Reported from Nicolaus Copernicus University

May 6, 2014

By a News Reporter-Staff News Editor at Physics Week -- Researchers detail new data in Quantum Dots. According to news reporting originating in Torun, Poland, by VerticalNews editors, the research stated, "I present a systematic study of self-assembled InAs/InP and InAs/GaAs quantum dot single-particle and many-body properties as a function of the quantum dot-surrounding matrix valence band offset. I use an atomistic, empirical tight-binding approach and perform numerically demanding calculations for half-million-atom nanosystems."

The news reporters obtained a quote from the research from Nicolaus Copernicus University, "I demonstrate that the overall confinement in quantum dots is a non-trivial interplay of two key factors: strain effects and the valence band offset. I show that strain effects determine both the peculiar structure of confined hole states of lens type InAs/GaAs quantum dots and the characteristic 'shell-like' structure of confined hole states in the commonly considered 'low-strain' lens type InAs/InP quantum dot. I also demonstrate that strain leads to single-band-like behavior of hole states of disk type ('indium flushed') InAs/GaAs and InAs/InP quantum dots."

According to the news reporters, the research concluded: "I show how strain and valence band offset affect quantum dot many-body properties: the excitonic fine structure, an important factor for efficient entangled photon pair generation, and the biexciton and charged exciton binding energies."

For more information on this research see: Valence band offset, strain and shape effects on confined states in self-assembled InAs/InP and InAs/GaAs quantum dots. Journal of Physics Condensed Matter, 2013;25(46):465301.

Our news correspondents report that additional information may be obtained by contacting M. Zieli?ski, Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5, 87-100 Torun, Poland.

Keywords for this news article include: Torun, Poland, Europe, Quantum Dots, Nanotechnology, Quantum Physics, Emerging Technologies.

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Source: Physics Week