Journal of Nanomedicine & Nanotechnology

Nonlinear current response to applied voltage in nanoscale devices and circuits

3^rd International Conference on Nanotek & Expo

December 02-04, 2013 Hampton Inn Tropicana, Las Vegas, NV, USA

Vijay K. Arora

Accepted Abstracts: J Nanomed Nanotechnol

Abstract:

The breakdown of Ohm?s law exhibiting nonlinear response to applied voltage has been observed in graphene, silicon, and other semiconducting materials. The current response to external stimulus does follow Ohm?s law below the critical voltage that depends on the length of the sample as well as material properties. However, the major departure from this Ohmic behavior arises when voltage applied is above the critical voltage that is proportional to the length of a sample. As length enters nanometer dimensions, the critical voltage can be as low as fraction of a volt. At this scale, many published works are debating whether or not the resistance or mobility has any meaning. We show that resistance becomes a strong function of applied dc voltage that rises dramatically under differential conditions for signal propagation. This rise in resistance is accompanied by the current saturation as voltage goes far beyond the critical voltage. We show that this saturation arises from stochastic velocity vectors being transformed to streamline unidirectional vectors. The focus is on extreme non-equilibrium distribution that is discussed extensively. The onset of quantum emission (photon or phonon) inhibits this saturation even further. The current response to applied voltage is discussed on two basic premises: transformation of 3D material to low-dimensional one in a quantum domain with length of the sample in any of the three Cartesian directions below the de Broglie wavelength resulting in low dimensionality; and the response to voltages that exceed the critical voltage. Contemporary applications to low-dimensional nanomaterials are discussed

Biography :

Vijay K. Arora completed Ph.D. in Physics from the University of Colorado. He has held distinguished appointments at the University of Tokyo, National University of Singapore, Nanyang Technological University, University of Western Australia, and Universiti Teknologi Malaysia. He is an IEEE-EDS distinguished lecturer and has been invited to give keynote papers internationally. He has published more than 100 papers in reputed journals and many uncounted publications in conference proceedings. He serves on the editorial board of a number of journals. He was chair of NanoSingapore2006, NanotechMalaysia2010, and EscienceNano2012 conferences.