scholarly journals Electron-photon coupling in mesoscopic quantum electrodynamics

2015 ◽  
Vol 91 (20) ◽  
Author(s):  
A. Cottet ◽  
T. Kontos ◽  
B. Douçot
Keyword(s):  
Quantum Electrodynamics ◽  
Electron Photon ◽  
Photon Coupling

scholarly journals Coupling a single electron on superfluid helium to a superconducting resonator

2019 ◽  
Vol 10 (1) ◽  
Author(s):  
Gerwin Koolstra ◽  
Ge Yang ◽  
David I. Schuster
Keyword(s):  
Quantum Electrodynamics ◽  
Coherent Control ◽  
Single Electron ◽  
Strong Interactions ◽  
Dimensional System ◽  
Trapped Electrons ◽  
Electrons On Helium ◽  
Single Electrons ◽  
Microwave Regime ◽  
Electron Photon

AbstractElectrons on helium form a unique two-dimensional system on the interface of liquid helium and vacuum. A small number of trapped electrons on helium exhibits strong interactions in the absence of disorder, and can be used as a qubit. Trapped electrons typically have orbital frequencies in the microwave regime and can therefore be integrated with circuit quantum electrodynamics (cQED), which studies light–matter interactions using microwave photons. Here, we experimentally realize a cQED platform with the orbitals of single electrons on helium. We deterministically trap one to four electrons in a dot integrated with a microwave resonator, allowing us to study the electrons’ response to microwaves. Furthermore, we find a single-electron-photon coupling strength of $$g/2\pi =4.8\pm 0.3$$g∕2π=4.8±0.3 MHz, greatly exceeding the resonator linewidth $$\kappa /2\pi =0.5$$κ∕2π=0.5 MHz. These results pave the way towards microwave studies of Wigner molecules and coherent control of the orbital and spin state of a single electron on helium.

STRONG ELECTRON-PHONON COUPLING AND THE ORTHORHOMBIC TO TETRAGONAL TRANSITION IN La2CuO4

1988 ◽  
Vol 02 (05) ◽  
pp. 827-836 ◽  
Author(s):  
S. Barišić ◽  
I. Batistić
Keyword(s):  
Metal Oxides ◽  
Hole Concentration ◽  
Coupling Constant ◽  
Phonon Coupling ◽  
Strong Electron ◽  
Electron Phonon Coupling ◽  
The Stability ◽  
Electron Photon ◽  
Small Polarons ◽  
Photon Coupling

It is proposed that the main contribution to the electron-photon coupling in ionic metals arises from the deformation induced variation of the crystal field on the ionic sites which are involved in conduction. The latter are assumed here to be the oxygen sites in the CuO 2 planes of the layered metal oxides. The coupling of holes on those sites to the tilting mode of the La 2 CuO 4 lattice is investigated in detail. Although the coupling is quadratic in small tilting displacement the large value of the corresponding coupling constant explains the destabilization of the tilted (orthorhombic) La 2 CuO 4 lattice on increasing the hole concentration. It is shown that the holes are suppressing the tilt locally, creating the regions of the tetragonal please, as observed recently in the photogeneration experiments. The stability of the corresponding small polarons (tiltons) is discussed in detail.

Optimizing electron-photon coupling in quantum well infrared photodetectors

1999 ◽  
Author(s):  
Ying Fu ◽  
Magnus Willander ◽  
Wei Lu ◽  
W. L. Xu ◽  
Ning Li ◽  
...  
Keyword(s):  
Quantum Well ◽  
Infrared Photodetectors ◽  
Quantum Well Infrared Photodetectors ◽  
Electron Photon ◽  
Photon Coupling

scholarly journals IONIZATION BY QUANTIZED ELECTROMAGNETIC FIELDS: THE PHOTOELECTRIC EFFECT

2008 ◽  
Vol 20 (04) ◽  
pp. 367-406 ◽  
Author(s):  
HERIBERT ZENK
Keyword(s):  
Quantum Electrodynamics ◽  
Single Photon ◽  
Relativistic Quantum ◽  
Ionization Probability ◽  
Bound State ◽  
Photoelectric Effect ◽  
The Standard Model ◽  
The One ◽  
Electron Photon ◽  
Photon Interactions

In this paper, we explain the photoelectric effect in a variant of the standard model of non relativistic quantum electrodynamics, which is in some aspects more closely related to the physical picture, than the one studied in [5]. Now, we can apply our results to an electron with more than one bound state and to a larger class of electron-photon interactions. We will specify a situation, where the second order of ionization probability is a weighted sum of single photon terms. Furthermore, we will see that Einstein's equality [Formula: see text] for the maximal kinetic energy E kin of the electron, energy hν of the photon and ionization gap △E is the crucial condition, for these single photon terms to be nonzero.

scholarly journals Compton Scattering, Pair Annihilation, and Pair Production in a Plasma

2000 ◽  
Vol 195 ◽  
pp. 359-366
Author(s):  
V. Krishan
Keyword(s):  
Compton Scattering ◽  
Cross Sections ◽  
High Plasma ◽  
Electron Positron ◽  
Pair Annihilation ◽  
The Cross ◽  
Unmagnetized Plasma ◽  
Electron Photon ◽  
Electron Positron Pair ◽  
Photon Coupling

The square of the four-momentum of a photon in vacuum is zero. However, in an unmagnetized plasma, it is equal to the square of the plasma frequency. Further, the electron-photon coupling vertex is modified in a plasma to include the effect of the plasma medium. I calculate the cross sections of three processes in a plasma—Compton scattering and electron-positron pair annihilation and production. At high plasma densities, the cross sections are found to change significantly. Such high plasma densities exist in several astrophysical sources.

scholarly journals Quantum Electrodynamics in Strong Magnetic Fields. III. Electron?Photon Interactions

1983 ◽  
Vol 36 (6) ◽  
pp. 799 ◽  
Author(s):  
DB Melrose ◽  
AJ Parle
Keyword(s):  
Compton Scattering ◽  
Ground State ◽  
Quantum Electrodynamics ◽  
Relativistic Quantum ◽  
Photon Pair ◽  
Photon Excitation ◽  
Pair Annihilation ◽  
Quantum Electron ◽  
Electron Photon ◽  
Photon Interactions

A version of QED is developed which allows one to treat electron-photon interactions in the magnetized vacuum exactly and which allows one to calculate the responses of a relativistic quantum electron gas and include these responses in QED. Gyromagnetic emission and related crossed processes, and Compton scattering and related processes are discussed in some detail. Existing results are corrected or generalized for nonrelativistic (quantum) gyroemission, one-photon pair creation, Compton scattering by electrons in the ground state and two-photon excitation to the first Landau level from the ground state. We also comment on maser action in one-photon pair annihilation.

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