scholarly journals Manifestation of the Purcell Effect in Current Transport through a Dot–Cavity–QED System

Nanomaterials ◽  
2019 ◽  
Vol 9 (7) ◽  
pp. 1023 ◽  
Author(s):  
Nzar Rauf Abdullah ◽  
Chi-Shung Tang ◽  
Andrei Manolescu ◽  
Vidar Gudmundsson
Keyword(s):  
Cavity Qed ◽  
Photon Number ◽  
Far Infrared ◽  
Purcell Effect ◽  
Photon Polarization ◽  
Resonant States ◽  
The Mean ◽  
Dimensional Electron Gas ◽  
Electron Photon ◽  
Photon Coupling

We study the transport properties of a wire-dot system coupled to a cavity and a photon reservoir. The system is considered to be microstructured from a two-dimensional electron gas in a GaAs heterostructure. The 3D photon cavity is active in the far-infrared or the terahertz regime. Tuning the photon energy, Rabi-resonant states emerge and in turn resonant current peaks are observed. We demonstrate the effects of the cavity–photon reservoir coupling, the mean photon number in the reservoir, the electron–photon coupling and the photon polarization on the intraband transitions occurring between the Rabi-resonant states, and on the corresponding resonant current peaks. The Rabi-splitting can be controlled by the photon polarization and the electron–photon coupling strength. In the selected range of the parameters, the electron–photon coupling and the cavity-environment coupling strengths, we observe the results of the Purcell effect enhancing the current peaks through the cavity by increasing the cavity–reservoir coupling, while they decrease with increasing electron–photon coupling. In addition, the resonant current peaks are also sensitive to the mean number of photons in the reservoir.

scholarly journals The photocurrent generated by photon replica states of an off-resonantly coupled dot-cavity system

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Nzar Rauf Abdullah ◽  
Chi-Shung Tang ◽  
Andrei Manolescu ◽  
Vidar Gudmundsson
Keyword(s):  
Quantum Dot ◽  
Coupling Strength ◽  
Electronic System ◽  
Quantum Master Equation ◽  
Steady State Regime ◽  
Photon Polarization ◽  
State Regime ◽  
Cavity System ◽  
Electron Photon ◽  
Photon Coupling

Abstract Transport properties of a quantum dot coupled to a photon cavity are investigated using a quantum master equation in the steady-state regime. In the off-resonance regime, when the photon energy is smaller than the energy spacing between the lowest electron states of the quantum dot, we calculate the current that is generated by photon replica states as the electronic system is pumped with photons. Tuning the electron-photon coupling strength, the photocurrent can be enhanced by the influences of the photon polarization, and the cavity-photon coupling strength of the environment. We show that the current generated through the photon replicas is very sensitive to the photon polarization, but it is not strongly dependent on the average number of photons in the environment.

The influence of the classical homogenous gravitational field on interaction of a three-level atom with a single mode cavity field

2015 ◽  
Vol 29 (29) ◽  
pp. 1550175 ◽  
Author(s):  
N. H. Abd El-Wahab ◽  
Ahmed Salah
Keyword(s):  
Electromagnetic Field ◽  
Gravitational Field ◽  
Photon Number ◽  
Single Mode ◽  
Temporal Behavior ◽  
Cavity Field ◽  
Text Type ◽  
Level Atom ◽  
The Mean ◽  
Single Mode Cavity

We study the interaction between a single mode electromagnetic field and a three-level [Formula: see text]-type atom in the presence of a classical homogenous gravitational field when the atom is prepared initially in the momentum eigenstate. The model includes the detuning parameters and the classical homogenous gravitational field. The wave function is calculated by using the Schrödinger equation for a coherent electromagnetic field and an atom is in its excited state. The influence of the detuning parameter and the classical homogenous gravitational field on the temporal behavior of the mean photon number, the normalized second-order correlation function and the normal squeezing is analyzed. The results show that the presence of these parameters has an important effect on these phenomena. The conclusion is reached and some features are given.

scholarly journals The creation and detection of arbitrary photon number states using cavity QED

2004 ◽  
Vol 6 ◽  
pp. 97-97 ◽  
Author(s):  
Benjamin T H Varcoe ◽  
Simon Brattke ◽  
Herbert Walther
Keyword(s):  
Cavity Qed ◽  
Photon Number ◽  
The Creation

scholarly journals Optical Bistability in an Optomechanical System with N-Type Atoms under Nonresonant Conditions

Photonics ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 122
Author(s):  
Yan Gao ◽  
Li Deng ◽  
Aixi Chen
Keyword(s):  
Optical Bistability ◽  
Light Field ◽  
Photon Number ◽  
Optical Switches ◽  
Atomic Ensemble ◽  
Cavity Field ◽  
Bistable Behavior ◽  
Optomechanical System ◽  
The Mean ◽  
Nonlinear Distribution

In this paper, the phenomenon of the optical bistability of a cavity field is theoretically investigated in an optomechanical system containing an N-type atomic ensemble. In this hybrid optomechanical system, the atoms are coupled with two controlling light fields besides coupling with the cavity field. Under the nonresonant condition, we analyze the influences of the coupling strength between cavity and atoms, Rabi frequencies of the controlling light field, the detuning between the controlling light field and atoms, and pump field power on the optical bistable behavior of mean intracavity photon number. The nonlinear distribution of the mean intracavity photon number has a potential application in field optical switches and optical bistable devices.

scholarly journals The Nature of the Emission-line Nebulae in Powerful Far-infrared Galaxies

1990 ◽  
Vol 124 ◽  
pp. 409-413
Author(s):  
Lee Armus ◽  
Timothy M. Heckman ◽  
George K. Miley
Keyword(s):  
Emission Line ◽  
Narrow Band ◽  
Broad Band ◽  
Far Infrared ◽  
Interacting Galaxies ◽  
Spectral Energy ◽  
Infrared Galaxies ◽  
Energy Distributions ◽  
Infrared Spectral ◽  
The Mean

AbstractWe discuss our program of narrow-band (Hα + [Nil]) imaging of a sample of 30 powerful far-infrared galaxies (FIRG’s) chosen to have far-infrared spectral energy distributions similar to the prototype FIRG’s Arp 220, NGC 3690, NGC 6240, and M82. The emission-line nebulae of these IR color-selected sample (ICSS) galaxies as a class are both impressively large (mean half light radius, r ~1.3 Kpc, and mean diameter, D ~16 Kpc) and luminous (LTOT ~108 Lo; uncorrected for internal extinction). The mean total Hα + [Nil] luminosity of the FIRG’s is comparable to that found for pairs of optically selected interacting galaxies (Bushouse, Lamb, and Werner 1988), but is a factor of ~5 greater than that of isolated spirals (Kennicutt and Kent 1983). Only ~25% of the nearby (z ≤ 0.10) FIRG’s have morphologies suggesting that large HII~regions contribuí significantly to their emission-line appearance. The broad-band morphologies of our IR color-selected galaxies fall into three major categories. Nearly 75% are single galaxy systems, with the remaining FIRG’s being either multiple nuclei systems, or members of interacting pairs. Since we see few (10%) currently interacting FIRG’s, yet many (80%) with highly distorted continuum morphologies, our IR color criteria may be preferentially selecting galaxies that have undergone highly inelastic, rapidly merging interactions.

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