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Study Results from Shanxi University in the Area of Low Dimensional Structures Reported (Exciton complexes assisted transition channels in the...

July 22, 2014



Study Results from Shanxi University in the Area of Low Dimensional Structures Reported (Exciton complexes assisted transition channels in the optically excited single-electron tunneling units)

By a News Reporter-Staff News Editor at Physics Week -- Investigators publish new report on Low Dimensional Structures. According to news reporting originating in Taiyuan, People's Republic of China, by VerticalNews journalists, research stated, "The emission spectrum from the optically excited single electron tunneling devices, electrostatically coupled to a p-type side quantum dot, has been investigated. The 12 exciton-complexes transition processes have been found and can be classified into six electron-like and six hole-like transition processes."

The news reporters obtained a quote from the research from Shanxi University, "The self-consistent numerical analysis shows that the gate and bias voltages can be tuned to change the weight functions associated with the particular exciton-complexes transition processes, thereby influencing the intensity and frequency-dependence of the spontaneous emission signals. The energy discrepancies up to the quadratic terms with respect to bias voltages are taken into account to interpret different degrees of the Stark shifts experienced by the electron and the hole. There exist several competition mechanisms, where the increase of the gate voltage can neutralize the shift to lower-energy transition channels produced by the increase of the hole occupancy in the side dot, and the interdot repulsive and attractive Coulombic blockades compete with each other to determine the superiority or inferiority of the different resonance channels."

According to the news reporters, the research concluded: "The electron-like resonance channels can be switched to the hole-like ones or vice versa in the optical spectra by tuning the gate voltages."

For more information on this research see: Exciton complexes assisted transition channels in the optically excited single-electron tunneling units. Physica E-Low-Dimensional Systems & Nanostructures, 2014;60():118-126. Physica E-Low-Dimensional Systems & Nanostructures can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands.

Our news correspondents report that additional information may be obtained by contacting W.X. Yan, Shanxi Univ, Coll Phys & Elect, Taiyuan 030006, People's Republic of China.

Keywords for this news article include: Asia, Taiyuan, People's Republic of China, Low Dimensional Structures

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Source: Physics Week


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