Lenin Prizes for 1966

Keldysh, L. V.; Shpol'skiĭ, É V

doi:10.1070/pu1967v009n04abeh003022

Cited by 120 publications

(172 citation statements)

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“…Table 2. Physical parameters relevant to HHG for the H atom with two laser wavelengths k 0 5 800 and 1064 nm and three laser intensities I 5 5 3 10 13 , 10 14 , and 2 3 10 14 W/cm 2 : Keldysh parameter c5 ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi I p =ð2U p Þ p , [47] ponderomotive energy U p 5E 2 0 =ð4x 2 0 Þ (in hartree), energy cutoff in the three-step model E cutoff 5 I p 1 3.17U p (in hartree) where I p 5 0.5 hartree is the ionization potential, harmonic cutoff in the three-step model N cutoff 5 E cutoff /x 0 , and maximum electron excursion distance in the continuum R max 52E 0 =x 2 0 (in bohr) in the threestep model.…”

Section: Resultsmentioning

confidence: 99%

Gaussian continuum basis functions for calculating high-harmonic generation spectra

Coccia

Mussard

Labeye

et al. 2016

Int. J. Quantum Chem.

104

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We explore the computation of high-harmonic generation spectra by means of Gaussian basis sets in approaches propagating the time-dependent Schrödinger equation. We investigate the efficiency of Gaussian functions specifically designed for the description of the continuum proposed by Kaufmann et al. [J. Phys. B 22, 2223(1989]. We assess the range of applicability of this approach by studying the hydrogen atom, i.e. the simplest atom for which "exact" calculations on a grid can be performed. We notably study the effect of increasing the basis set cardinal number, the number of diffuse basis functions, and the number of Gaussian pseudo-continuum basis functions for various laser parameters. Our results show that the latter significantly improve the description of the low-lying continuum states, and provide a satisfactory agreement with grid calculations for laser wavelengths λ0 = 800 and 1064 nm. The Kaufmann continuum functions therefore appear as a promising way of constructing Gaussian basis sets for studying molecular electron dynamics in strong laser fields using time-dependent quantum-chemistry approaches.

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Section: Resultsmentioning

confidence: 99%

Gaussian continuum basis functions for calculating high-harmonic generation spectra

Coccia

Mussard

Labeye

et al. 2016

Int. J. Quantum Chem.

104

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“…[65][66][67] This should be distinguished from a Bose-Einstein condensate (BEC) of excitons, or bound states of a single electron-hole pair. [68,69] A transition from an exciton BEC to a BCS state has been predicted for increasing densities of electrons and holes at low temperatures. [70] Many systems have been suggested as suitable for excitonic condensation.…”

Section: Introductionmentioning

confidence: 99%

Dynamically Induced Excitonic Instability in Pumped Dirac Materials

Pertsova

Balatsky

2020

Annalen der Physik

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Driven and non‐equilibrium quantum states of matter have attracted growing interest in both theoretical and experimental studies in condensed matter physics. Recent progress in realizing transient collective states in driven or pumped Dirac materials (DMs) is reviewed herein. In particular, the focus is on optically pumped DMs which are a promising platform for transient excitonic instabilities. Optical pumping combined with the linear (Dirac) dispersion of the electronic spectrum offers a knob for tuning the effective interaction between the photoexcited electrons and holes, and thus provides a way of reducing the critical coupling for excitonic instability. As a result, a transient excitonic condensate could be achieved in a pumped DM while it is not feasible in equilibrium. A unifying theoretical framework is provided for describing transient collective states in 2D and 3D DMs. The experimental signatures are described and numerical estimates of the size of the dynamically induced excitonic gaps and the values of the critical temperatures for several specific systems, are summarized. In addition, general guidelines for identifying promising material candidates are discussed. Finally, comments are provided regarding recent experimental efforts in realizing transient excitonic condensate in pumped DMs, and outstanding issues and possible future directions are outlined.

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“…1 Introduction After having discovered the moving and stationary high-field domains 1 [1,2] with an electrooptical effect [3] which we coined as Franz-Keldysh effect [4,5], we described these domains as caused by a negative differential conductivity, independent whether caused by a stronger than linear decrease of the electron density [6] or the mobility [7] with the electric field. For a first theoretical analysis we used the field-of-direction method in 1961 [8].…”

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confidence: 99%

Stationary high‐field domains as tools to measure field‐dependent carrier densities and mobilities in CdS and work functions of blocking contacts

Böer

2012

Physica Status Solidi (b)

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It is shown that stationary high-field domains that occur in the range of negative differential conductivity, can be used to clearly identify field-quenched states in CdS. These are distinguished as cathode and anode-adjacent domains and permit an unambiguous determination of electron density and mobility as function of the electric field. The anode-adjacent domain permits additional insight into the high-field properties of CdS in a field range that is now stabilized in the prebreakdown range. Here one finds direct evidence, by using the spectral distribution of the photoconductivity within the domain, of inverting the CdS to p-type either by more complete quenching or by hole injection from the anode. Both types of stationary domains are determined by the work function of blocking contacts and thereby permit a closer analysis of the contact/CdS interface by shifting the space charge region away from the cathode to the bulk-side end of the domain. This allows a more precise determination of the dependence of the work function on the photoconductivity of the adjacent CdS. The field-of-direction (phase portrait) analysis of the time-independent transport and Poisson equations allows a simple classification of the two types of stationary high-field domains relating to the two singular points in the decreasing branch of the current-voltage characteristic. This permits a transparent discussion of the field distribution of these domains that can be directly observed by the Franz-Keldysh effect. Herewith the transition between cathode-to anode-adjacent domains as a function of the applied voltage can be directly followed.

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Lenin Prizes for 1966

Cited by 120 publications

References 0 publications

Gaussian continuum basis functions for calculating high-harmonic generation spectra

Gaussian continuum basis functions for calculating high-harmonic generation spectra

Dynamically Induced Excitonic Instability in Pumped Dirac Materials

Stationary high‐field domains as tools to measure field‐dependent carrier densities and mobilities in CdS and work functions of blocking contacts

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