Photoionization microscopy of the Rydberg Rb atom under a continuous infrared radiation laser field

2020 ◽  
Vol 98 (1) ◽  
pp. 24-33
Author(s):  
De-Hua Wang ◽  
Xin-Yue Sun ◽  
Tong Shi
Keyword(s):  
Infrared Radiation ◽  
Laser Field ◽  
Quantum Interference ◽  
Rydberg Atom ◽  
Laser Wavelength ◽  
Detector Plane ◽  
Electron Trajectories ◽  
Open Orbit ◽  
Scattering Effect ◽  
Oscillatory Pattern

The photoionization microscopy of the Rydberg Rb atom exposed to a continuous infrared radiation laser field is investigated based on the semiclassical open orbit theory. In contrast to the photoionization of the Rydberg hydrogen atom, the ionic core-scattering effect plays an important role in the photoionization of the Rb atom. Due to the core-scattering effect and the laser field, the electron trajectories become chaotic. A huge number of ionization trajectories from the ionic source to the detector plane appear, which makes the oscillatory pattern in the electron probability distribution become much more complicated. The ρ–θ curve on the detector plane exhibits a self-similar fractal structure for the ionization trajectories of the Rydberg Rb atom in the laser field. Due to constructive and destructive quantum interference of different electron trajectories, a series of concentric rings appear in the photoionization microscopy interference patterns on the detector plane. The electron probability density distributions on the detector are found to be changed sensitively with the scaled electron energy and the laser wavelength. Even as the detector plane is located at a macroscopic distance from the photoionization source, the photoionization microscopy interference patterns can be observed clearly. These calculations may provide a valuable contribution to the actual experimental study of the photoionization microscopy of non-hydrogenic Rydberg atom in the laser field.

scholarly journals Interference of a resonance state with itself: a route to control its dynamical behaviour

2020 ◽  
Vol 22 (26) ◽  
pp. 14637-14644
Author(s):  
A. García-Vela
Keyword(s):  
Laser Field ◽  
Quantum Interference ◽  
Dynamical Behavior ◽  
Resonance State ◽  
Weak Field ◽  
Dynamical Behaviour ◽  
State Distribution ◽  
Decay Lifetime

It is demonstrated both numerically and mathematically that the dynamical behavior of an isolated resonance state (the decay lifetime and the asymptotic fragment state distribution), can be extensively controlled by means of quantum interference induced by a laser field in the weak-field regime.

Time-dependent electric field effect on the photodetachment dynamics of negative ions

2017 ◽  
Vol 95 (5) ◽  
pp. 507-513 ◽  
Author(s):  
De-hua Wang
Keyword(s):  
Electric Field ◽  
Probability Density ◽  
External Electric Field ◽  
Negative Ions ◽  
Time Dependent ◽  
Negative Ion ◽  
Electric Field Effect ◽  
Electron Trajectories ◽  
Oscillatory Pattern ◽  
Electron Probability Density

This paper addresses the photodetachment dynamics of a negative ion in a time-dependent electric field based on the semiclassical open-orbit theory. The photodetached electron probability density in a real time domain is studied in a gradient electric field for the first time. It is found that because of the influence of the gradient electric field, two or more electron trajectories can arrive at a given point on the detector, and the interference effect between these electron trajectories causes oscillatory structures in the electron probability density. Our calculation results suggest that when the external electric field changes very slowly with time, only two electron trajectories can arrive at a given point on the detector and the electron probability density exhibits a regular two-term oscillatory pattern. However, when the electric field changes quickly with time, four electron trajectories can reach the detector, which makes the oscillatory structures in the electron probability density become much more complicated. In addition, the electric field strength, photon energy, and the position of the detector can affect the electron probability density of this system sensitively. Our study provides a clear and intuitive picture for the photodetachment dynamics of the negative ion in the external electric field from a time-dependent viewpoint and may guide the future experimental researches on the photodetachment microscopy of negative ions in the time-dependent electric field.

scholarly journals Ultrafast Dynamics of High-Harmonic Generation in Terms of Complex Floquet Spectral Analysis

Symmetry ◽  
2018 ◽  
Vol 10 (8) ◽  
pp. 313 ◽  
Author(s):  
Hidemasa Yamane ◽  
Satoshi Tanaka
Keyword(s):  
Spectral Analysis ◽  
Harmonic Generation ◽  
Laser Field ◽  
Quantum Interference ◽  
High Harmonic ◽  
High Harmonic Generation ◽  
Spectral Features ◽  
Quantum Process ◽  
Time Regime ◽  
Long Time

We studied the high-harmonic generation (HHG) of a two-level-system (TLS) driven by an intense monochromatic phase-locked laser based on complex spectral analysis with the Floquet method. In contrast with phenomenological approaches, this analysis deals with the whole process as a coherent quantum process based on microscopic dynamics. We have obtained the time-frequency resolved spectrum of spontaneous HHG single-photon emission from an excited TLS driven by a laser field. Characteristic spectral features of the HHG, such as the plateau and cutoff, are reproduced by the present model. Because the emitted high-harmonic photon is represented as a superposition of different frequencies, the Fano profile appears in the long-time spectrum as a result of the quantum interference of the emitted photon. We reveal that the condition of the quantum interference depends on the initial phase of the driving laser field. We have also clarified that the change in spectral features from the short-time regime to the long-time regime is attributed to the interference between the interference from the Floquet resonance states and the dressed radiation field.

Photodetachment microscopy of H– ion in time-dependent electric and magnetic fields

2018 ◽  
Vol 96 (9) ◽  
pp. 961-968
Author(s):  
De-hua Wang
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Electric Field ◽  
Interference Pattern ◽  
Current Distribution ◽  
Time Dependent ◽  
Electron Current ◽  
Detector Plane ◽  
Electron Trajectories ◽  
Electric And Magnetic Fields

We examine the dynamics of electrons photodetached from the H– ion in time-dependent electric and magnetic fields for the first time. The photodetachment microscopy patterns caused by a time-dependent gradient electric field and magnetic field have been analyzed in great detail based on the semiclassical theory. The interplay of the gradient electric field and magnetic field forces causes an intricate shape of the electron wave and multiple electron trajectories generated by a fixed energy point source can arrive at a given point on the microchannel-plate detector. The interference effects between these electron trajectories cause the oscillatory structures of the electron probability density and electron current distribution, and a set of concentric interference fringes are found at the detector. Our calculation results suggest that the photodetachment microscopy interference pattern on the detector can be adjusted by the electron energy, magnetic field strength, and position of the detector plane. Under certain conditions, the interference pattern in the electron current distribution might be seen on the detector plane localized at a macroscopic distance from the photodetachment source, which can be observed in an actual photodetachment microscopy experiment. Therefore, we make predictions that our work should serve as a guide for future photodetachment microscopy experiments in time-dependent electric and magnetic fields.

scholarly journals DC field microscopy of Rydberg Li atoms

2016 ◽  
Vol 94 (6) ◽  
pp. 548-557 ◽  
Author(s):  
Dehua Wang ◽  
Shaohao Cheng ◽  
Qiang Chen ◽  
Zhaohang Chen
Keyword(s):  
Electric Field ◽  
Semiclassical Approximation ◽  
Field Potential ◽  
Detector Plane ◽  
Point Energy ◽  
Atomic Core ◽  
Density Distributions ◽  
Scattering Effect ◽  
Electric Field Potential ◽  
Probability Density Distributions

The DC field microscopy of Rydberg Li atoms has been studied on the basis of the semiclassical theory for the first time. In particular, we discuss the atomic core scattering effect in the ionization dynamics of the Rydberg Li atom. Unlike the case of the photoionization of a Rydberg H atom in an electric field, where the photoionization microscopy interference patterns are mainly caused by the Coulomb scattering and the electric field potential, for the photoionization of a Rydberg Li atom in an electric field, the influence of the atomic core scattering effect on the photoionization microscopy interference patterns plays an important role. In addition, the structure of the interference pattern, which contains the spatial component of the electronic wave function, evolves smoothly with the electron energy above the saddle point energy. The observed oscillatory patterns in the electron probability density distributions on the detector plane are interpreted within the framework of the semiclassical approximation, which can be considered as a manifestation of interference between various electron trajectories arriving at a given point from the atom to the detector plane. This study provides some reference values for future experimental research on photoionization microscopy of the non-hydrogen Rydberg atoms in the presence of external fields.

scholarly journals Laser Assisted Charge Exchange in Atomic Collisions

1991 ◽  
Vol 11 (3-4) ◽  
pp. 285-290 ◽  
Author(s):  
J. F. Castillo ◽  
L. F. Errea ◽  
L Méndez ◽  
A. Riera
Keyword(s):  
Cross Section ◽  
Charge Exchange ◽  
Cross Sections ◽  
Laser Field ◽  
Laser Wavelength ◽  
Total Charge ◽  
Atomic Collisions ◽  
Radiative Transitions ◽  
The Cross ◽  
Impact Energies

We present total charge exchange cross sections for collisions of Li(1s22s2S) with H(1s) in presence of a linear polarized laser field of intensity 0.05 ≤ I ≤ 1 TW/cm2 and wavelength 5 103 ≤ λ ≤ 14 103 Å. Our calculation shows that the laser field can increase the cross section of this reaction by a factor of ten at impact energies E < 0.1 ke V/a.m.u. The mechanism of this process is discussed and it is shown that both atomic and molecular radiative transitions can take place depending on the laser wavelength employed.

Demonstration of device conductance modulation by electrostatic control of the electron phase

1996 ◽  
Vol 74 (S1) ◽  
pp. 207-211 ◽  
Author(s):  
C. Gould ◽  
A. Sachrajda ◽  
Y. Feng ◽  
A. Delage ◽  
P. Kelly ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Gate Voltage ◽  
Quantum Interference ◽  
Electron Trajectory ◽  
Classical Electron ◽  
Classical Action ◽  
Electron Trajectories ◽  
Quantum Interference Effect ◽  
Electrostatic Control ◽  
Related Phase

In this paper we describe a novel effect observed in a quantum wire containing two parallel "artificial" (i.e., electrostatically defined antidots) impurities. At low magnetic fields we observe a series of resistance peaks. These occur at magnetic fields for which classical electron trajectories are commensurate with the device geometry. The resistance peaks are modulated by periodic oscillations that can be observed both as a function of the applied magnetic field or the gate voltage, which controls the size of the impurities. These oscillations are analyzed in terms of the classical action of ballistic electrons on closed trajectories, the related phase gained along these trajectories, and the resulting quantum interference effect. We show that these oscillations when observed as a function of gate voltage are consistent with changes of the electron wavelength along part of the electron trajectory. The device conductance is thus being modulated by the electrostatic control of the electron phase.

scholarly journals Controllable atom-photon entanglement via quantum interference near plasmonic nanostructure

2022 ◽  
Vol 12 (1) ◽  
Author(s):  
Behzad Sangshekan ◽  
Mostafa Sahrai ◽  
Seyyed Hossein Asadpour ◽  
Jafar Poursamad Bonab
Keyword(s):  
Spontaneous Emission ◽  
Laser Field ◽  
Quantum Interference ◽  
Atomic System ◽  
Two Dimensional ◽  
Control Field ◽  
Plasmonic Nanostructure ◽  
Atomic Distance ◽  
Control Laser

AbstractA five-level atomic system is proposed in vicinity of a two-dimensional (2D) plasmonic nanostructure with application in atom-photon entanglement. The behavior of the atom-photon entanglement is discussed with and without a control laser field. The amount of atom-photon entanglement is controlled by the quantum interference created by the plasmonic nanostructure. Thus, the degree of atom-photon entanglement is affected by the atomic distance from the plasmonic nanostructure. In the presence of a control field, maximum entanglement between the atom and its spontaneous emission field is observed.

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