Tuning the Quasi-bound States of Double-barrier Structures: Insights from Resonant Tunneling Spectra

TL;DR

This paper investigates how the energy levels of quasi-bound states in double-barrier structures can be tuned by adjusting inter-barrier spacing, affecting electronic and optical properties with potential applications in high-precision radiation detection.

Contribution

The study provides a mathematical criterion for quasi-bound states and demonstrates how tuning the inter-barrier spacing manipulates electronic structures and optical absorption features.

Findings

Resonant tunneling energies correspond to quasi-bound state levels.

QBS energy levels vary stepwise with inter-barrier spacing.

Optical absorption features can be tuned from infrared to visible spectrum.

Abstract

In this work, we study the resonant tunneling (RT) of electrons and H atoms in double-barrier (DB) systems. Our numerical calculations directly verify the correspondence between the resonant tunneling energies and the energy levels of quasi-bound states (QBS) within the double barriers. Based on this, in-depth analyses are carried out on the modulation of QBS energy levels and numbers which show step variation with the inter-barrier spacing. The mathematical criterion for the existence of QBS is derived, and the impacts of the barrier width and barrier height on QBS levels are investigated. Taking the rectangular double-barrier as an example, we have studied the manipulation of electronic structures and optical properties of the inter-barrier region (quasi-potential well) by tuning the inter-barrier spacing (width of quasi-potential well). Atom-like optical absorption features are found in the range of infrared to visible spectrum, which can be continuously tuned by the variation of quasi-potential well width. The potential application of double-barrier nanostructures in ultrahigh-precision detection of electromagnetic radiations is demonstrated.