Interaction of a single-cycle laser pulse with a bound electron without ionization

Parali, Ufuk; Alexander, Dennis R.

doi:10.1364/oe.18.015155

Cited by 7 publications

(4 citation statements)

References 36 publications

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“…where P (x) is a polynomial [165]. Selection of appropriate polynomials allows for the engineering of the action of the ultrashort pulse on the system as the coefficients s 1 , s 2 , s 3 , and s 3 are varied.…”

Section: Polynomial With a Gaussian Envelopementioning

confidence: 99%

Charge and spin dynamics driven by ultrashort extreme broadband pulses: a theory perspective

Moskalenko,

Zhu,

Berakdar

2016

Preprint

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This article gives an overview on recent theoretical progress in controlling the charge and spin dynamics in low-dimensional electronic systems by means of ultrashort and ultrabroadband electromagnetic pulses.A particular focus is put on sub-cycle and single-cycle pulses and their utilization for coherent control. The discussion is mostly limited to cases where the pulse duration is shorter than the characteristic time scales associated with the involved spectral features of the excitations. The relevant current theoretical knowledge is presented in a coherent, pedagogic manner. We work out that the pulse action amounts in essence to a quantum map between the quantum states of the system at an appropriately chosen time moment during the pulse. The influence of a particular pulse shape on the post-pulse dynamics is reduced to several integral parameters entering the expression for the quantum map. The validity range of this reduction scheme for different strengths of the driving fields is established and discussed for particular nanostructures. Acting with a periodic pulse sequence, it is shown how the system can be steered to and largely maintained in predefined states. The conditions for this nonequilibrium sustainability are worked out by means of geometric phases, which are identified as the appropriate quantities to indicate quasistationarity of periodically driven quantum systems. Demonstrations are presented for the control of the charge, spin, and valley degrees of freedom in nanostructures on picosecond and subpicosecond time scales. The theory is illustrated with several applications to one-dimensional semiconductor quantum wires and superlattices, double quantum dots, semiconductor and graphene quantum rings. In the case of a periodic pulsed driving the influence of the relaxation and decoherence processes is included by utilizing the density matrix approach. The integrated and time-dependent spectra of the light emitted from the driven system deliver information on its spin-dependent dynamics. We review examples of such spectra of photons emitted from pulse-driven nanostructures as well as a possibility to characterize and control the light polarization on an ultrafast time scale. Furthermore, we consider the response of strongly correlated systems to short broadband pulses and show that this case bears a great potential to unveil high order correlations while they build up upon excitations.

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Section: Polynomial With a Gaussian Envelopementioning

confidence: 99%

Charge and spin dynamics driven by ultrashort extreme broadband pulses: a theory perspective

Moskalenko,

Zhu,

Berakdar

2016

Preprint

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“…Ufuk Parali and Dennis Alexander (2010). Modeling the Interaction of a Single-Cycle Laser Pulse with a Bound Electron without Ionization, Coherence and Ultrashort Pulse Laser Emission, Dr. F. J. Duarte (Ed.…”

Section: How To Referencementioning

confidence: 99%

“…This modification turned the Lorentz oscillator model equation into a Hill-like function with non-periodic time varying damping and spring coefficients. In section two of this book chapter, we extend earlier work (Parali & Alexander, 2010) by introducing a convolution of the applied electric field with the time dependent position of the electron. This latter model provides a continuous updating of the applied electric field convoluted with the time dependent position of the electrons motion.…”

mentioning

confidence: 93%

“…These single cycle pulse models are used as driving functions for the classical approach to model the interaction of a bound electron with an applied electric field. A new novel time-domain technique was developed for modifying the classical Lorentz damped oscillator model in order to make it compatible with USCP excitation (Parali & Alexander, 2010). This modification turned the Lorentz oscillator model equation into a Hill-like function with non-periodic time varying damping and spring coefficients.…”

mentioning

confidence: 99%

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Modeling the Interaction of a Single-Cycle Laser Pulse with a Bound Electron without Ionization

Parali¹,

Alexander²

2010

Coherence and Ultrashort Pulse Laser Emission

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Unconventional light - matter interaction in the response-time region of unionized bound electrons

Parali

2024

Appl. Phys. B

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In the literature, the experimental studies in laser-bound electron interaction without ionization show us that a specific amount of material-dependent response time must already pass so that the conventional interaction starts afterward and the bound electrons sense the electric field being applied to them. On the other hand, due to the lack of this conventional interaction in the mentioned material-specific response-time region, it is not correct to assume that the material is absolutely transparent to the applied field during this time period, in which we hypothesized that there must be an unconventional light-matter interaction phenomenon. We report the first numerical hypothesis for modeling the mechanism of this phenomenon, of which the interaction procedure has not yet been clearly understood. Our hypothesis very simply modifies the interaction Hamiltonian of the system by embedding an unknown time-varying function that we named the modifier function, proposing that it exists only in the response-time region of the material. The numerical solution in this study proved the existence of the modifier function in the response-time region for the first time. In our humble opinion, this proven phenomenon must be studied and understood more clearly both theoretically and experimentally for each material.

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Interaction of a single-cycle laser pulse with a bound electron without ionization

Cited by 7 publications

References 36 publications

Charge and spin dynamics driven by ultrashort extreme broadband pulses: a theory perspective

Charge and spin dynamics driven by ultrashort extreme broadband pulses: a theory perspective

Modeling the Interaction of a Single-Cycle Laser Pulse with a Bound Electron without Ionization

Unconventional light - matter interaction in the response-time region of unionized bound electrons

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