What is plasmon exciton coupling?

Plasmons are collective oscillations of conduction electrons in metals, and coupling of light to plasmon resonances in metal nano-structures has attracted attention primarily because of their ability to concentrate optical fields to volumes well below the diffraction limit [1]. …

What is an exciton in physics?

An exciton is a bound state of an electron and an electron hole which are attracted to each other by the electrostatic Coulomb force. It is an electrically neutral quasiparticle that exists in insulators, semiconductors and some liquids.

What is exciton coupling?

Exciton coupling features arise in electronic absorption and circular dichroism spectra when chromophores are brought into close spatial proximity, for example by coordination to a metal centre. The analysis of these features can reveal much information such as the geometry of a complex and its absolute configuration.

What is positive hole?

In physics, a hole is an electric charge carrier with a positive charge, equal in magnitude but opposite in polarity to the charge on the electron. Holes and electrons are the two types of charge carriers responsible for current in semiconductor materials. In P-type semiconductor material, the opposite is true.

What is self trapped exciton?

Self-trapped excitons (STEs), occurring in a material with soft lattice and strong electron–phonon coupling, emit photons with broad spectrum and large Stokes shift. Recently, series halide perovskites with efficient STE emission have been reported and showed promise for solid-state lighting.

What is free exciton?

A free exciton is a bound electron-hole pair that has a binding energy of a few meV. Generation of electron-hole pairs in a semiconductor can be achieved by illuminating a semiconductor sample with light with photon energies larger than the energy gap of the semiconducto.

Why are holes positive?

In an applied electric field, the electrons move in one direction, corresponding to the hole moving in the other. If a hole associates itself with a neutral atom, that atom loses an electron and becomes positive. Therefore, the hole is taken to have positive charge of +e, precisely the opposite of the electron charge.

What are hole charges?

In physics, a hole is an electric charge carrier with a positive charge, equal in magnitude but opposite in polarity to the charge on the electron. Holes and electrons are the two types of charge carriers responsible for current in semiconductor materials.

What is self trap?

Self-trapping occurs when the self-interaction energy between the Bosons is larger than a critical value called . It was first described in 1997. It has been observed in Bose-Einsten condensates of exciton-polaritons, and predicted for a condensate of magnons.

Are holes positive?

Unlike an electron which has a negative charge, holes have a positive charge that is equal in magnitude but opposite in polarity to the charge an electron has. Holes can move from atom to atom in semiconducting materials as electrons leave their positions.

Is hole a positive charge?

A positive charge occurs when the number of protons exceeds the number of electrons. A positive charge may be created by adding protons to an atom or object with a neutral charge. A positive charge also can be created by removing electrons from a neutrally charged object.

What are positive holes?

Hole, in condensed-matter physics, the name given to a missing electron in certain solids, especially semiconductors. Since a missing electron is the same as an added positive electric charge, holes can carry a current—like that of electrons but in the opposite direction—under an electric field.

How does plasmon mode-volume affect the exciton interaction?

Our results show that decreasing radiation damping inversely drives the plasmon–exciton interaction toward a strong coupling regime. However, we find that plasmon mode-volume is a more fundamental parameter in dictating coupling strength than radiation damping.

What is the role of plasmon decay channels?

Unravelling the exact role of each individual plasmon decay channel in plasmon–exciton coupling is pivotal for successful realization of the exciting potential applications of plexcitonic nanostructures.

How are plasmonic cavities used to control quantum states?

Using model simulations based on an extended Jaynes-Cummings Hamiltonian, we find that the involvement of a dark state of the quantum dots explains the experimental findings. The coupling of quantum emitters to plasmonic cavities thus exposes complex relaxation pathways and emerges as an unconventional means to control dynamics of quantum states.

Which is more important plasmon mode volume or radiation damping?

However, we find that plasmon mode-volume is a more fundamental parameter in dictating coupling strength than radiation damping. Overall, this comprehensive study provides a significant step toward developing a predictive understanding of how exactly excitation decay channels influence plasmon–exciton coupling.