English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Strongly-coupled quantum dot molecules (QDMs) are widely deployed in thedesign of a variety of optoelectronic, photovoltaic, and quantum informationdevices. An efficient and optimized performance of these devices demandsengineering of the electronic and optical properties of the underlying QDMs.The application of electric fields offers a knob to realise such control overthe QDM characteristics for a desired device operation. We performmulti-million-atom atomistic tight-binding calculations to study the influenceof electric fields on the electron and hole wave function confinements andsymmetries, the ground-state transition energies, the band-gap wavelengths, andthe optical transition modes. The electrical fields both parallel ($\vec{E_p}$)and anti-parallel ($\vec{E_a}$) to the growth direction are investigated toprovide a comprehensive guide on the understanding of the electric fieldeffects. The strain-induced asymmetry of the hybridized electron states isfound to be weak and can be balanced by applying a small $\vec{E_a}$ electricfield, of the order of 1 KV/cm. The strong interdot couplings completely breakdown at large electric fields, leading to single QD states confined at theopposite edges of the QDM. This mimics a transformation from a type-I bandstructure to a type-II band structure for the QDMs, which is a criticalrequirement for the design of intermediate-band solar cells (IBSC). Theanalysis of the field-dependent ground-state transition energies reveal thatthe QDM can be operated both as a high dipole moment device by applying largeelectric fields and as a high polarizibility device under the application ofsmall electric field magnitudes. [abstract is truncated to fit the charactercount of arXiv]

Understanding electric field control of electronic and optical properties of strongly-coupled multi-layer quantum dot molecules