Title: Excitons in a quasi-one-dimensional quantum nanorod under a strong electric field

Abstract

The response of an exciton in the ground and first excited states to a strong DC electric field is studied in a quasi-one-dimensional nano quantum well (i.e., nanorod) bounded by high symmetric barriers by studying the energy, the oscillator strength, the root-mean-square (RMS) average of the electron-hole (e-h) separation, and the average positions of the electron and the hole. The interplaying effect between the barrier confinement, e-h attraction, and the field-induced e-h separation for exciton binding is examined. We find that, for a long nanorod, the exciton energy, as well as, the oscillator strength drops abruptly as a function of the field near the exciton-dissociation field while the RMS average of the e-h separation rises rapidly. For shorter rods, the transition is more gradual due to the combined effect of the confinement and the long-range e-h interaction. A strong field is shown to transform the optically-inactive first excited state into an optically-active state in the field range between the dissociation field of the ground state and that of the first excited level. Here, we also find that, in the ground state, the (lighter) electron is dragged by the (heavier) hole below the dissociation field. The dependence of the above mentionedmore » properties on the rod length is also investigated for varying fields. The results are compared with those obtained for the rods with parabolic confinement.« less

Authors:

Lyo, S. K. ^[1]

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+ Show Author Affiliations

1. Univ. of California, Irvine, CA (United States). Dept. of Physics and Astronomy

Publication Date:

Tue Mar 18 00:00:00 EDT 2014

Research Org.:

Energy Frontier Research Centers (EFRC) (United States). EFRC for Solid State Lighting Science (SSLS)

Sponsoring Org.:

USDOE Office of Science (SC), Basic Energy Sciences (BES)

OSTI Identifier:

1383375

Grant/Contract Number:  

AC04-94AL85000

Resource Type:

Accepted Manuscript

Journal Name:

Journal of Applied Physics

Additional Journal Information:

Journal Volume: 115; Journal Issue: 11; Related Information: SSLS partners with Sandia National Laboratories (lead); California Institute of Technology; University of California, Irvine, Merced, and Santa Barbara; Los Alamos National Laboratory; University of New Mexico; Northwestern University; Philips Lumileds Lighting; Journal ID: ISSN 0021-8979

Publisher:

American Institute of Physics (AIP)

Country of Publication:

United States

Language:

English

Subject:

75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; solar (photovoltaic); solid state lighting; phonons; materials and chemistry by design; optics; synthesis (novel materials)