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Electron spectral density of the half-filled Hubbard model in the atomic limit at finite temperature
We have calculated the spectral function and density of states of halffilled two-dimensional Hubbard model in the Hubbard-I
approximation assuming an antiferromagnetic long range order at low temperature and compared results to the QMC data. It occurs
that calculated functions are in a qualitative agreement with the QMC one. We have also shown that Neel ordered state dispersion
has the similar form to the spin density wave one. 相似文献
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V. V. Sapunov 《Journal of Applied Spectroscopy》1996,63(4):514-521
Institute of Molecular and Atomic Physics, Academy of Sciences of Belarus, 70. F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 63, No. 4, pp. 613–621, July–August, 1996. 相似文献
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The nonlinear dynamics of a waveguide CO2 laser with combined periodic loss and pumping modulation is investigated theoretically and experimentally. The possibilities
of controlling time and energy parameters of the output radiation using the corresponding selection of the detuning of the
cavity's longitudinal mode from the center of the amplification line, the amplitude, and the frequency of loss modulation
are demonstrated. The observed asymmetric dependence of the lasing-radiation density on the detuning of the cavity frequency
is explained by the attendant modulation of the refractive index of the loss modulator.
To whom correspondence should be addressed.
B. I. Stepanov Institute of Physics, National Academy of Sciences of Belarus, 68, F. Skorina Ave., Minsk, 220072, Belarus.
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 66, No. 4, pp. 471–478, July–August, 1999. 相似文献
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The influence of changes in the refractive indices of the active medium and the loss modulator on the amplitude-detuning characteristic
of a CO2 laser was theoretically investigated. It is shown that at a comparatively great magnitude of sweeping the “instantaneous”
lasing frequency, the magnitude of the laser response increases not only in negative detunings, but also over a wide range
of positive detunings. The use of the procedure of changing the magnitude and sign of detuning as well as the range of sweeping
and the frequency of modulation makes it possible to realize various periodic and chaotic regimes of lasing, i.e., to exercise
control over the time and energy parameters of pulses over a very wide range.
B. I. Stepanov Institute of Physics of the Academy of Sciences of Belarus, 70, F. Skorina Ave., Minsk, 220072, Belarus. Translated
from Zhurnal Prikladnoi Spektroskopii, Vol. 64, No. 3, pp. 318–324, May–June, 1997. 相似文献
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V. M. Belous 《Journal of Applied Spectroscopy》1995,62(3):435-440
I. I. Mechnikov Odessa State University, 27, Pasteur Str., Odessa, 270100, Ukraine. Translated from Zhurnal Prikladnoi Spektroskopii,
Vol. 62, No. 3, pp. 42–48, May–June, 1995. 相似文献
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O. S. Gorya A. S. Keyanu I. V. Kravetskii L. L. Kulyuk O. M. Tatarinskaya 《Journal of Applied Spectroscopy》1995,62(3):537-540
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 3, pp. 160–163, May–June, 1995. 相似文献
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G. G. Shakhov 《Journal of Applied Spectroscopy》1995,62(3):431-434
S. I. Vavilov State Optical Institute, Russia, 199034, St. Peterburg, Birzhevaya Liniya, 12. Translated from Zhurnal Prikladnoi
Spektroskopii, Vol. 62, No. 3, pp. 38–42, May–June, 1995. 相似文献
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To whom correspondence should be addressd. 相似文献
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Bernard Jancewicz 《Central European Journal of Physics》2004,2(1):204-219
Alternative system of fundamental units: length, time, action, electrical charge is presented instead of the present one:
length, time, mass and electrical current. It contains more quantities which are scalars under scalings. Then it is possible
to recognize from the unit, what kind of a geometric quantity is a given physical quantity. This is the reason why the new
system of units is called compatible with geometry. 相似文献