scholarly journals Local electric-field control of multiferroic spin-spiral domains in TbMnO3

2020 ◽  
Vol 5 (1) ◽  
Author(s):  
Peggy Schoenherr ◽  
Sebastian Manz ◽  
Lukas Kuerten ◽  
Konstantin Shapovalov ◽  
Ayato Iyama ◽  
...  
Keyword(s):  
Electric Fields ◽  
Electrostatic Force ◽  
High Sensitivity ◽  
Laser Pulses ◽  
Magnetoelectric Coupling ◽  
Intense Laser ◽  
Antiferromagnetic Order ◽  
Intense Laser Fields ◽  
And Control ◽  
Spin Spiral

AbstractSpin-spiral multiferroics exhibit a magnetoelectric coupling effects, leading to the formation of hybrid domains with inseparably entangled ferroelectric and antiferromagnetic order parameters. Due to this strong magnetoelectric coupling, conceptually advanced ways for controlling antiferromagnetism become possible and it has been reported that electric fields and laser pulses can reversibly switch the antiferromagnetic order. This switching of antiferromagnetic spin textures is of great interest for the emergent field of antiferromagnetic spintronics. Established approaches, however, require either high voltages or intense laser fields and are currently limited to the micrometer length scale, which forfeits the technological merit. Here, we image and control hybrid multiferroic domains in the spin-spiral system TbMnO3 using low-temperature electrostatic force microscopy (EFM). First, we show that image generation in EFM happens via surface screening charges, which allows for probing the previously hidden magnetically induced ferroelectric order in TbMnO3 (PS = 6 × 10−4 C/m2). We then set the antiferromagnetic domain configuration by acting on the surface screening charges with the EFM probe tip. Our study enables detection of entangled ferroelectric and antiferromagnetic domains with high sensitivity. The spatial resolution is limited only by the physical size of the probe tip, introducing a pathway towards controlling antiferromagnetic order at the nanoscale and with low energy.

scholarly journals Laser-Induced Control of the Optical Response of Aluminum Phthalocyanine Chloride Complexes Dissolved in Ethanol

2021 ◽  
Vol 9 ◽  
Author(s):  
Carina da Costa Castanheira ◽  
Andreas Persch ◽  
Paul Birk ◽  
Christian Ott ◽  
Thomas Pfeifer
Keyword(s):  
Excited States ◽  
Time Window ◽  
Intense Laser ◽  
Intense Laser Fields ◽  
Chloride Complexes ◽  
Complex Molecules ◽  
Time Resolved ◽  
Coherent Coupling ◽  
Coupling Dynamics ◽  
And Control

We show that absorption spectra of aluminum chloride phthalocyanine (AlClPc) in the liquid phase can be dynamically modified through the time-resolved interaction with a second laser pulse during a time window on the order of 100 fs. The observed effects can be explained by laser-induced coherent coupling dynamics between the ground state and a bath of excited states as reproduced by a few-level toy model. The presented results help to understand how intense laser fields interact with complex molecules in solution, but in their laser-controlled response still much alike isolated atoms in the gas phase. This understanding can, in the future, be used to modify and control the dynamics in complex systems.

HIGH-ORDER HARMONIC GENERATION IN INTENSE LASER AND MAGNETIC FIELDS

1995 ◽  
Vol 04 (03) ◽  
pp. 533-546 ◽  
Author(s):  
T. ZUO ◽  
A. D. BANDRAUK
Keyword(s):  
Magnetic Fields ◽  
Harmonic Generation ◽  
Laser Pulses ◽  
High Order ◽  
Intense Laser ◽  
Two Dimensional ◽  
Intense Laser Fields ◽  
High Order Harmonic Generation ◽  
Strong Magnetic Fields ◽  
High Order Harmonic

The effect of strong magnetic fields on high-order harmonic generation is considered for the [Formula: see text] molecule and a two-dimensional hydrogen atom in intense laser fields. Exact solutions of the time-dependent Schrödinger equation reveals: (i) strong magnetic fields parallel to the laser polarization confine the ionized electron wavepacket thereby enhancing the intensity and extending the harmonic generation spectrum; (ii) strong magnetic fields in combination with intense circularly polarized laser pulses can be used to control even and odd harmonic generation in two-dimensional atoms.

scholarly journals Analysis of above-threshold ionization by “Wigner-distribution-like function” method

2019 ◽  
Vol 37 (4) ◽  
pp. 448-462 ◽  
Author(s):  
Li Guo ◽  
Mingqing Liu ◽  
Ronghua Lu ◽  
Shensheng Han ◽  
Jing Chen
Keyword(s):  
Time Distribution ◽  
Wigner Distribution ◽  
Laser Pulses ◽  
Intense Laser ◽  
Angular Distributions ◽  
Intense Laser Fields ◽  
Ionization Time ◽  
Above Threshold Ionization ◽  
Linearly Polarized ◽  
Offset Time

AbstractAbove-threshold ionization (ATI) is one of the most fundamental processess when atoms or molecules are subjected to intense laser fields. Analysis of ATI process in intense laser fields by a Wigner-distribution-like (WDL) function is reviewed in this paper. The WDL function is used to obtain various time-related distributions, such as time-energy distribution, ionization time distribution, and time-emission angle distribution and so on, of atoms in laser field pulses with different laser parameters. For the linearly polarized laser pulses, the time-energy distribution intuitively shows from a quantum point of view the relationship between the ionization moment and the final energy and clearly reveals the origin of interference structures in the photoelectron spectrum. In particular, for linearly polarized few-cycle laser pulses, all calculated distributions show the dependence of electron behavior on the ionization time, emission direction, and carrier-envelope phase (CEP). For elliptically polarized few-cycle pulses, we calculate the angular distribution, ionization time distribution, and time-emission distribution, which are compared with the semiclassical calculations. Analysis shows that the offset angle (difference between positions of the peaks in the angular distributions obtained by two methods) in the angular distributions does not correspond to the offset time (difference between positions of the peaks in the ionization time distributions obtained by two methods) in the ionization time distributions, which implies that the attosecond angular streaking technique based on this correspondence between the offset angle and time is in principle inaccurate. Furthermore, the offset time cannot be interpreted as tunneling time.

scholarly journals Jitter-free 40-fs 375-keV electron pulses directly accelerated by an intense laser beam and their application to direct observation of laser pulse propagation in a vacuum

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Shunsuke Inoue ◽  
Shuji Sakabe ◽  
Yoshihide Nakamiya ◽  
Masaki Hashida
Keyword(s):  
Laser Pulse ◽  
Electric Fields ◽  
Pulse Compression ◽  
Permanent Magnets ◽  
Pulse Propagation ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Intense Laser ◽  
Electron Pulse ◽  
Electron Pulses

AbstractWe report the generation of ultrashort bright electron pulses directly driven by irradiating a solid target with intense femtosecond laser pulses. The duration of electron pulses after compression by a phase rotator composed of permanent magnets was measured as 89 fs via the ponderomotive scattering of electron and laser pulses, which were almost at the compression limit due to the dispersion of the electron optics. The electron pulse compression system consisting of permanent magnets enabled extremely high timing stability between the laser pulse and electron pulse. The long-term RMS arrival time drift was below 14 fs in 4 h, which was limited by the resolution of the current setup. Because there was no time-varying field to generate jitter, the timing jitter was essentially reduced to zero. To demonstrate the capability of the ultrafast electron pulses, we used them to directly visualize laser pulse propagation in a vacuum and perform 2D mapping of the electric fields generated by low-density plasma in real time.

scholarly journals Quantum interference and imaging using intense laser fields

2021 ◽  
Vol 75 (10) ◽  
Author(s):  
Kasra Amini ◽  
Alexis Chacón ◽  
Sebastian Eckart ◽  
Benjamin Fetić ◽  
Matthias Kübel
Keyword(s):  
Quantum Interference ◽  
Wave Packets ◽  
High Harmonic ◽  
Photoelectron Spectra ◽  
Intense Laser ◽  
Intense Laser Fields ◽  
Electron Wave ◽  
Laser Fields ◽  
Above Threshold Ionization ◽  
And Control

Abstract The interference of matter waves is one of the intriguing features of quantum mechanics that has impressed researchers and laymen since it was first suggested almost a century ago. Nowadays, attosecond science tools allow us to utilize it in order to extract valuable information from electron wave packets. Intense laser fields are routinely employed to create electron wave packets and control their motion with attosecond and ångström precision. In this perspective article, which is based on our debate at the Quantum Battles in Attoscience virtual workshop 2020, we discuss some of the peculiarities of intense light-matter interaction. We review some of the most important techniques used in attosecond imaging, namely photoelectron holography and laser-induced electron diffraction. We attempt to ask and answer a few questions that do not get asked very often. For example, if we are interested in position space information, why are measurements carried out in momentum space? How to accurately retrieve photoelectron spectra from the numerical solution of the time-dependent Schrödinger equation? And, what causes the different coherence properties of high-harmonic generation and above-threshold ionization? GraphicAbstract

Electron spin fluctuation in intense laser fields

2017 ◽  
Vol 19 (46) ◽  
pp. 31138-31155
Author(s):  
Youssef Korani ◽  
Hassan Sabzyan
Keyword(s):  
Dirac Equation ◽  
Electron Spin ◽  
Spin Fluctuation ◽  
Laser Pulses ◽  
Time Dependent ◽  
Intense Laser ◽  
Intense Laser Fields ◽  
Laser Fields ◽  
Intense Laser Pulses ◽  
Fluctuation Dynamics

Spin fluctuation dynamics of diatomic and monoatomic ions interacting with ultrashort intense laser pulses is studied by solving the time-dependent Dirac equation.

scholarly journals Ultrafast Reaction Imaging and Control by Ultrashort Intense Laser Pulses

2020 ◽  
Vol 93 (11) ◽  
pp. 1293-1304
Author(s):  
Akiyoshi Hishikawa ◽  
Akitaka Matsuda ◽  
Mizuho Fushitani
Keyword(s):  
Laser Pulses ◽  
Intense Laser ◽  
Intense Laser Pulses ◽  
And Control

QED PROCESSES IN INTENSE LASER FIELDS

2012 ◽  
Vol 14 ◽  
pp. 394-402
Author(s):  
ANTON ILDERTON
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Laser Light ◽  
Laser Pulses ◽  
Pair Creation ◽  
Intense Laser ◽  
Intense Laser Fields ◽  
Fundamental Physics ◽  
X Ray ◽  
Background Fields

Intense laser light at facilities such as the Extreme Light Infrastructure and the European X-ray Free Electron Laser offer new prospects for probing fundamental physics. Here we examine the theory behind QED processes in background fields modelling ultra-strong, short-duration laser pulses. We focus on pair creation via the trident and photon-stimulated mechanisms.

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