Related Experiment Video
Updated: May 30, 2026
12:57
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
Published on: October 13, 2017
Stark effect of interactive electron-hole pairs in spherical semiconductor quantum dots.
B Billaud1, M Picco, T-T Truong
1Laboratoire de Physique Théorique et Hautes Energies (LPTHE), CNRS UMR 7589, Université Pierre et Marie Curie (Paris VI), 4 place Jussieu, F-75252 Paris Cedex 05, France. Laboratoire de Physique Théorique et Modélisation (LPTM), CNRS UMR 8089, Université de Cergy-Pontoise, 2 Avenue Adolphe Chauvin, F-95302 Cergy-Pontoise Cedex, France.
Summary
We developed a theoretical model for quantum-confined Stark effects in semiconductor quantum dots. Our findings show the electric field
Area of Science:
- Quantum dot physics
- Semiconductor nanostructures
- Solid-state physics
Background:
- Quantum-confined Stark effects (QCSE) are crucial for understanding exciton behavior in nanostructures.
- Semiconducting quantum dots exhibit unique optical and electronic properties due to quantum confinement.
- The influence of electric fields on quantum dots is a key area of research.
Purpose of the Study:
- To present a theoretical approach for quantum-confined Stark effects in spherical semiconducting quantum dots.
- To investigate the roles of Coulomb potential and polarization energy in strong confinement and weak electric fields.
- To analyze the electric field dependence of the Stark shift.
Main Methods:
- Utilizing the effective mass approximation model.
- Performing analytical calculations under reasonable physical assumptions.
- Investigating interactive electron-hole pairs in the strong confinement regime.
Main Results:
- The Stark shift is found to be a quadratic function of the electric field amplitude.
- Detailed analysis of Coulomb potential and polarization energy contributions.
- Computed numerical values show good agreement with experimental data.
Conclusions:
- The theoretical approach accurately describes quantum-confined Stark effects in quantum dots.
- The model provides a reliable framework for predicting Stark shifts across various quantum dot sizes.
- This work contributes to a deeper understanding of electric field interactions in semiconductor nanostructures.
Related Concept Videos
01:24Metal-Semiconductor Junctions
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
01:27π Electron Effects on Chemical Shift: Overview
An applied magnetic field causes loosely bound π-electrons in organic molecules to circulate, producing a local or induced diamagnetic field over a large spatial volume. As the molecules tumble in solution, the field generated by π-electrons in spherical substituents results in a zero net field. However, the net field generated by π-electrons in non-spherical substituents is not zero. The effect of this induced field depends on the orientation of the molecule with respect to B0, resulting in...
01:12Fermi Level Dynamics
The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
01:14π Electron Effects on Chemical Shift: Aromatic and Antiaromatic Compounds
In aromatic compounds, such as benzene, the circulation of (4n + 2) π-electrons sets up a diamagnetic or diatropic ring current around the perimeter of the molecule. This current induces a magnetic field that opposes the external field inside the ring and reinforces it on the outside. The protons in benzene are deshielded and exhibit high chemical shifts in the range 6.5–8.5 ppm. The shielding effect at the center of the ring is evident in complex aromatic molecules, such as annulenes. In...
01:22Semiconductors
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
01:27Biasing of Metal-Semiconductor Junctions
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...