To study the effects of degradation of phonon distribution on the high frequency response in nano structures

S.-K. Sarkar (1) , Souvik Sarkar (2) , P.K. Sahu (3) , K.-S. Kumar (4) , S. Rani (5)

1 Dep. Electronics and Telecommunication Engineering
2 RKM Residential College
3 National Institute of Technology
4 Dr. M. G. R. College of Engineering
5 Sapthagiri College of Engineering

There has been an intense interest in low dimensional semiconductor nano structures, because of subtle and profound changes that occurs, as length scale becomes comparable to the exciton Bohr radii and the dimensionality is reduced significantly.[1] In nano structures, hot electron conditions are developed if the applied electric field is sufficiently high so as to cause a pronounced deviation from Ohm&orporated. This behaviour is attributed to the slowing down of the carrier energy and momentum loss rates in the presence of non equilibrium phonons[2]. Thus, we find that the degradation of phonon distribution enhances significantly the 3-dB cut-off frequency thereby makes the high frequency response flatter reflecting that high frequency response is better if effects of nonequilibrium phonon distribution are included in the calculations.
1. A. Majumdar, L. P. Rokhinson and D. C. Tsui : - Appl. Phys. Lett - 76, 3600 (2000)
2. A. S. Vengurlkar, S. S. Prabhu, S. K. Roy and J. Shah : Phy. Rev .B-50,461(1994)

Mots clés: low dimensional semiconductor nano structures; Frolich coupling; LO phonons; phonon lifetime

Domaines: Science des matériaux [cond-mat.mtrl-sci]

S.-K. Sarkar, Souvik Sarkar, P.K. Sahu, K.-S. Kumar, S. Rani. To study the effects of degradation of phonon distribution on the high frequency response in nano structures. ENS 2006, Dec 2006, Paris, France. pp.79-82. ⟨hal-00166769⟩