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Title: Asymmetry of the Stokes and anti-Stokes components of the nonlinear response of high-temperature superconductors in the method of picosecond biharmonic pumping

Abstract

It is shown in the model of the nonlinear response of high-temperature superconductors (HTSCs) caused by interband transitions in the electronic spectrum with a metastable energy gap that the Stokes and anti-Stokes components of the HTSC response to picosecond biharmonic pumping are asymmetric, and for the excitation-pulse frequency detuning exceeding 100 cm{sup -1}, the efficiency of self-diffraction in the directions corresponding to these two components is different. (nonlinear optical phenomena)

Authors:
; ; ; ;  [1]
  1. International Laser Center, M. V. Lomonosov Moscow State University, Moscow (Russian Federation)
Publication Date:
OSTI Identifier:
21466618
Resource Type:
Journal Article
Resource Relation:
Journal Name: Quantum Electronics (Woodbury, N.Y.); Journal Volume: 37; Journal Issue: 2; Other Information: DOI: 10.1070/QE2007v037n02ABEH013324
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; ASYMMETRY; DIFFRACTION; EFFICIENCY; ENERGY GAP; EXCITATION; HIGH-TC SUPERCONDUCTORS; NONLINEAR PROBLEMS; PULSES; PUMPING; SPECTRA; COHERENT SCATTERING; ENERGY-LEVEL TRANSITIONS; SCATTERING; SUPERCONDUCTORS; TYPE-II SUPERCONDUCTORS

Citation Formats

Bobyrev, Yu V, Petnikova, V M, Royanova, G A, Rudenko, K V, and Shuvalov, Vladimir V. Asymmetry of the Stokes and anti-Stokes components of the nonlinear response of high-temperature superconductors in the method of picosecond biharmonic pumping. United States: N. p., 2007. Web. doi:10.1070/QE2007V037N02ABEH013324.
Bobyrev, Yu V, Petnikova, V M, Royanova, G A, Rudenko, K V, & Shuvalov, Vladimir V. Asymmetry of the Stokes and anti-Stokes components of the nonlinear response of high-temperature superconductors in the method of picosecond biharmonic pumping. United States. doi:10.1070/QE2007V037N02ABEH013324.
Bobyrev, Yu V, Petnikova, V M, Royanova, G A, Rudenko, K V, and Shuvalov, Vladimir V. Wed . "Asymmetry of the Stokes and anti-Stokes components of the nonlinear response of high-temperature superconductors in the method of picosecond biharmonic pumping". United States. doi:10.1070/QE2007V037N02ABEH013324.
@article{osti_21466618,
title = {Asymmetry of the Stokes and anti-Stokes components of the nonlinear response of high-temperature superconductors in the method of picosecond biharmonic pumping},
author = {Bobyrev, Yu V and Petnikova, V M and Royanova, G A and Rudenko, K V and Shuvalov, Vladimir V},
abstractNote = {It is shown in the model of the nonlinear response of high-temperature superconductors (HTSCs) caused by interband transitions in the electronic spectrum with a metastable energy gap that the Stokes and anti-Stokes components of the HTSC response to picosecond biharmonic pumping are asymmetric, and for the excitation-pulse frequency detuning exceeding 100 cm{sup -1}, the efficiency of self-diffraction in the directions corresponding to these two components is different. (nonlinear optical phenomena)},
doi = {10.1070/QE2007V037N02ABEH013324},
journal = {Quantum Electronics (Woodbury, N.Y.)},
number = 2,
volume = 37,
place = {United States},
year = {Wed Feb 28 00:00:00 EST 2007},
month = {Wed Feb 28 00:00:00 EST 2007}
}
  • Assuming that the nonlinear response of high-temperature superconductors is caused by interband transitions in the electronic spectrum with a metastable energy gap, a model describing the results of experiments performed by picosecond coherent four-photon spectroscopy with a high excitation level is developed. It is shown that a jump in the dependence of the self-diffraction efficiency on the initial temperature of a sample should be observed in the vicinity of the point of superconducting phase transition. It is found that upon biharmonic pump - probing, the energy gap in the electronic spectrum can be detected by a specific two-photon resonance. (nonlinearmore » optical phenomena)« less
  • Ultrathin (5 - 25 nm thick) nickel films were investigated experimentally by the picosecond biharmonic pumping method. Characteristic side resonances in the wing of the dependence of the self-diffraction efficiency on the frequency detuning of the biharmonic pumping components were observed. A model of the electronic part of the cubic nonlinear susceptibility was constructed. It takes into account the real structure of the spectrum of the electronic states of nickel, its quantum-size renormalisation and spin splitting, interband and intraband relaxation, as well as selection rules for the electronic transitions. For interband polarisation relaxation times T{sub 2} > 300 fs, amore » qualitative agreement was obtained between the calculated relationships and the experimental data. In the frequency-degenerate case, points at which the nonlinear response should be absent were found on the frequency scale. (this issue is dedicated to the memory of s a akhmanov)« less
  • The C-C stretching vibrations (1100-1400 cm{sup -1}) of the K-590 intermediate (containing a {sup 13}C{sub 14,15} retinal), formed during the room-temperature (RT) bacteriorhodopsin (BR) photocycle, are measured using picosecond time-resolved coherent anti-Stokes Raman scattering (PTR/CARS). These PTR/CARS data are first time-resolved vibrational spectra from a picosecond BR intermediate at RT containing an isotopically-labeled ({sup 13}C) retinal. The C{sub 14} and C{sub 15} positions are selected for isotopic labeling because motions around the C{sub 13}=C{sub 14} and C{sub 14}-C{sub 15} bonds are thought to underlie the structural transformation from BR-570 to K-590 and, therefore, the energy storage and transduction mechanism inmore » the RT/BR photocycle. Comparisons of these PTR/CARS data at RT with the results from earlier resonance Raman (RR) studies of K-590 at low temperature (LT) reveal new temperature effects. Analogous temperature-dependent differences are found in data measured from {sup 13}C{sub 14,15} K-590 in D{sub 2}O samples. Independently, PTR/CARS data at RT demonstrate that deuteration of the Schiff-base nitrogen causes major changes in the fingerprint region. No such deuterium effect is observed in the LT/RR date from {sup 13}C{sub 14,15} K-590. The previously unrecognized sensitivity of fingerprint bands to deuteration of the Schiff-base nitrogen suggests that the C-C stretching modes are highly mixed with each other and coupled to the N-H(D) retinal rocking mode. 57 refs., 7 figs., 3 tabs.« less
  • It is shown that basic properties of the nonlinear response of high-temperature superconductors (HTSCs) observed in femtosecond and picosecond pump-probe experiments at high and low pump levels in various variants of the pump-probe spectroscopy, including one- and two-photon excited-state probing, can be interpreted by using two assumptions. The spectral and temperature properties of the HTSC response at low pump levels can be explained taking into account the contributions from interband electronic transitions to the dielectric constant. At the same time, drastic variations in the HTSC response kinetics (temporal features) observed at high pump levels (for a typical pump pulse energymore » of {approx}10{sup -7} J in a focal spot of diameter 150 {mu}m) can be explained by assuming the existence of a 'frozen' (metastable) energy gap in the electronic spectrum of a HTSC. In this case, all the conditions required for the interpretation of a drastic decrease in the relaxation rate of a nonlinear response (degeneracy) are realised due to the specific distribution of the electronic state density immediately after the formation of the energy gap in the electronic spectrum of the HTSC. (review)« less
  • It is shown that all the spectral-temporal and temperature anomalies of a nonlinear response of high-temperature superconductors (HTSCs) observed in the pump-probe spectroscopy at high excitation levels can be interpreted taking into account contributions of interband electronic transitions to the dielectric constant of an excited HTSC film with a 'frozen' energy gap in the electronic spectrum. A model is constructed which explains all these 'anomalies' by a drastic decrease in the rates of three-particle nonradiative recombination of excess carriers under strong degeneracy conditions. It is found that this situation takes place due to the specific distribution of the density ofmore » electronic states in a HTSC almost immediately after the 'opening' of the energy gap in the electronic spectrum. (nonlinear optical phenomena)« less