Nanoplatelets as material system between strong confinement and weak confinement

Abstract

Recently, the fabrication of CdSe nanoplatelets became an important research topic. Nanoplatelets are often described as having a similar electronic structure as 2D dimensional quantum wells and are promoted as colloidal quantum wells with monolayer precision width. In this paper, we show, that nanoplatelets are not ideal quantum wells, but cover depending on the size: the strong confinement regime, an intermediate regime and a Coulomb dominated regime. Thus, nanoplatelets are an ideal platform to study the physics in these regimes. Therefore, the exciton states of the nanoplatelets are numerically calculated by solving the full four dimensional Schrödinger equation. We compare the results with approximate solutions from semiconductor quantum well and quantum dot theory. The paper can also act as review of these concepts for the colloidal nanoparticle community.

9 pages

References in corpus (4)

• Theory of Neutral and Charged Excitons in Monolayer Transition Metal Dichalcogenides
• Evidence of giant oscillator strength in the exciton dephasing of CdSe nanoplatelets measured by resonant four-wave mixing
• Tight-binding calculations of image charge effects in colloidal nanoscale platelets of CdSe
• p-State Luminescence in CdSe Nanoplatelets: The Role of Lateral Confinement and an LO Phonon Bottleneck

Cited by in corpus (10)

• Tuning intraband and interband transition rates via excitonic correlation in low-dimensional semiconductors
• Observation of the quantized motion of excitons in CdSe nanoplatelets
• Dielectric Confinement Enables Molecular Coupling in Stacked Colloidal Nanoplatelets
• Ab-initio variational wave functions for the time-dependent many-electron Schrödinger equation
• Explaining Observed Stability of Excitons in Highly Excited CdSe Nanoplatelets
• Optical properties of exciton in two-dimensional transition metal dichalcogenide nanobubbles
• Combined tensor network/cluster expansion method using logic gates: Illustrated for (bi-)excitons by a single layer MoS${}_2$ model system
• Nature and Control of Shakeup Processes in Colloidal Nanoplatelets
• Tensor network strategies for calculating biexcitons and trions in monolayer 2D materials beyond the ground state
• Theory of excitation transfer between two-dimensional semiconductor and molecular layers