Electron ( Spin & Charge ) and Nanoelectronics

Further miniaturization of the electronic devices is not possible with traditional (macro/micro) methods of synthesis of transistor materials and production of integrated circuits. Nanoelectronics is a branch of nanoscience/nanotechnology that addresses the industrial quest and commercial thirst for this miniaturization down to nanometer scales. Design and study of the nanoelctronic circuits which fundamental components are molecules is referred to as moletronics or molectronics. Shrinking electronic devices to these scales increases capacity of data storage devices, increases speed of digital computing processes, and decreases power consumption of electronic instruments. Nanoelectronics(molectronics) provides also possibility of manufacturing nanometric actuators and sensors which will revolutionize sciences and technologies of motion control, measurement, and biological monitoring, diagnostic and interferences.In order to design and properly apply effective nanoelectronic devices and circuits, behavior of electrons (their charge and spin) in static field-free molecular and intermolecular spaces, and in the electro-dynamical systems under static and time-dependent external electric and magnetic fields, and electron-nuclear interaction should be known exactly.pintronics is a version of electronics in which the spin of electrons contributes to the steady state response properties and characteristics of the transport phenomena in an electronic device. This contribution provides a variety of new features to the performance of electronic devices, such as more secure encoding/decoding of data, magnetic control of the device function, accurate production of local magnetic fields, and more reliable sensing and actuating. In spintronics, spin density can redistribute under local fields either with or without charge transfer.Three critical problems are to be resolved prior to the use of nano-size and molecular devices in nanoelectronic circuits. These include: (i) limitations for packing moletronic devices in a three-dimensional space, (ii) possibility of tunneling between neighboring molecules, and (iii) energy dissipation in the nuclear motion of the molecules. The first two problems, which are well-defined in physicochemical contexts, are addressed so far by encapsulating the device with inert chemicals and/or capping with ı-bond insulating moieties, and spreading as farther as possible the circuit components over a two-dimensional space. While, the interferences between electronic and nuclear motions which can result in thermoelectric effects and uncontrollable energy-dissipation in nanoelectronic devices and circuits [۱], have not been investigated so far. These interferences are studied here based on QTAIM and normal mode analyses.

کلیدواژه ها:

Nanoelectronics ، Molecular electronics ، Spintronics ، Thermoelectric Effects