Nanotechnology

Researchers from National Chiao Tung University report on findings in physics

  2008 NOV 24 - (VerticalNews.com) -- "We consider a system of two vertical lens-shaped quantum dots. The quantum dots have substantially different diameters in contrast to most of the investigated structures," researchers in Hsinchu, Taiwan report.

  "We demonstrate theoretically a possibility to relocate the ground-state electronic wave function from one dot to another by applying an external magnetic field along the structure's growth direction. The relocation correlates with the anticrossing behavior of the two lowest electronic energy states of the quantum dot molecule. This effect originates from a nonuniform diamagnetic shift for the electronic states located in different dots and generates unusual features of the magnetization and magnetic susceptibility of the system. At low temperature, the differential susceptibility of the system has a positive peak. With increasing temperature the peak gradually disappears," wrote O. Voskoboynikov and colleagues, National Chiao Tung University.

  The researchers concluded: "From our results it follows the opportunity to design nonmagnetic semiconductor nanostructures with unusual magnetic properties."

  Voskoboynikov and colleagues published their study in Physical Review B (Theory of diamagnetism in an asymmetrical vertical quantum dot molecule. Physical Review B, 2008;78(11):3310).

  For additional information, contact O. Voskoboynikov, National Chiao Tung University, 1001 Ta Hsueh Rd., Hsinchu 300, Taiwan.

  Publisher contact information for the journal Physical Review B is: American Physical Society, One Physics Ellipse, College Pk, MD 20740-3844, USA.

  Keywords: Diamagnetism, Electronics, Emerging Technologies, Magnetic Field, Nanostructural, Nanostructure, Nanostructures, Nanotech, Nanotechnology, Physics, Quantum Dots, Quantum Physics, Semiconductor, National Chiao Tung University.

  This article was prepared by VerticalNews Nanotechnology editors from staff and other reports. Copyright 2008, VerticalNews Nanotechnology via VerticalNews.com.