News Column

New Quantum Dots Findings Reported from National Cheng Kung University (Electronic Quantum Trajectories in a Quantum Dot)

July 22, 2014

By a News Reporter-Staff News Editor at Physics Week -- New research on Quantum Dots is the subject of a report. According to news reporting originating from Tainan, Taiwan, by VerticalNews correspondents, research stated, "This article gives a quantum-trajectory demonstration of the observed electric, magnetic, and thermal effects on a quantum dot with circular or elliptic shape. By applying quantum trajectory method to a quantum dot, we reveal the quantum-mechanical meanings of the classical concepts of backscattering and commensurability, which were used in the literature to explain the peak locations of the magnetoresistance curve."

Our news editors obtained a quote from the research from National Cheng Kung University, "Under the quantum commensurability condition, electronic quantum trajectories in a circular quantum dot are shown to be stationary like a standing wave, whose presence increases the electrical resistance. A hidden quantum effect called magnetic stagnation is discovered and shown to be the main cause of the observed jumps of the magnetoresistance curve. Quantum trajectories in an elliptic quantum dot are found to be chaotic and an index of chaos called Lyapunov exponent is proposed to measure the irregularity of the various quantum trajectories."

According to the news editors, the research concluded: "It is shown that the response of the Lyapunov exponent to the applied magnetic field captures the main features of the experimental magnetoresistance curve."

For more information on this research see: Electronic Quantum Trajectories in a Quantum Dot. International Journal of Quantum Chemistry, 2014;114(14):920-930. International Journal of Quantum Chemistry can be contacted at: Wiley-Blackwell, 111 River St, Hoboken 07030-5774, NJ, USA. (Wiley-Blackwell -; International Journal of Quantum Chemistry -

The news editors report that additional information may be obtained by contacting C.D. Yang, National Cheng Kung University, Dept. of Aeronaut & Astronaut, Tainan 701, Taiwan.

Keywords for this news article include: Asia, Tainan, Taiwan, Physics, Quantum Dots, Nanotechnology, Magnetoresistance, Emerging Technologies

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Source: Physics Week

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