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Findings in the Area of Physics Reported from Ruhr University

May 27, 2014

By a News Reporter-Staff News Editor at Physics Week -- Researchers detail new data in Physics. According to news originating from Bochum, Germany, by VerticalNews correspondents, research stated, "We present capacitance-voltage spectra for the conduction band states of InAs quantum dots obtained under continuous illumination. The illumination leads to the appearance of additional charging peaks that we attribute to the charging of electrons into quantum dots containing a variable number of illumination-induced holes."

Our news journalists obtained a quote from the research from Ruhr University, "By this we demonstrate an electrical measurement of excitonic states in quantum dots. Magnetocapacitance-voltage spectroscopy reveals that the electron always tunnels into the lowest electronic state. This allows us to directly extract, from the highly correlated many-body states, the correlation energy. The results are compared quantitatively to state of the art atomistic configuration interaction calculations, showing very good agreement for a lower level of excitations and also limitations of the approach for an increasing number of particles."

According to the news editors, the research concluded: "Our experiments offer a rare benchmark to many-body theoretical calculations."

For more information on this research see: Direct quantitative electrical measurement of many-body interactions in exciton complexes in InAs quantum dots. Physical Review Letters, 2014;112(4):046803. (American Physical Society -; Physical Review Letters -

The news correspondents report that additional information may be obtained from P.A. Labud, Lehrstuhl fur Angewandte Festkorperphysik, Ruhr-Universitat Bochum, Universitatsstraße 150, D-44780 Bochum, Germany. Additional authors for this research include A. Ludwig, A.D. Wieck, G. Bester and D. Reuter.

Keywords for this news article include: Bochum, Europe, Germany, Quantum Dots, Quantum Physics.

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Source: Physics Week

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