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Semenov, A. D.; Hübers, H.-W.; Schubert, J.; Gol'tsman, G. N.; Elantiev, A. I.; Voronov, B. M.; Gershenzon, E. M. |
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Title |
Design and performance of the lattice-cooled hot-electron terahertz mixer |
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2000 |
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J. Appl. Phys. |
Abbreviated Journal |
J. Appl. Phys. |
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88 |
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11 |
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6758-6767 |
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HEB mixer, charge imbalance, HF current distribution |
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We present the measurements and the theoreticalmodel of the frequency-dependent noise temperature of a superconductor lattice-cooled hot-electron bolometer mixer in the terahertz frequency range. The increase of the noise temperature with frequency is a cumulative effect of the nonuniform distribution of the high-frequency current in the bolometer and the charge imbalance, which occurs at the edges of the normal domain and at the contacts with normal metal. We show that under optimal operation the fluctuation sensitivity of the mixer is determined by thermodynamic fluctuations of the noise power, whereas at small biases there appears additional noise, which is probably due to the flux flow. We propose the prescription of how to minimize the influence of the current distribution on the mixer performance. |
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0021-8979 |
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306 |
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Sergeev, A.; Mitin, V. |
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Electron-phonon interaction in disordered conductors: Static and vibrating scattering potentials |
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Journal Article |
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2000 |
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Phys. Rev. B. |
Abbreviated Journal |
Phys. Rev. B. |
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61 |
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9 |
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6041-6047 |
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disordered conductors, scattering potential, electron-phonon interaction |
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Employing the Keldysh diagram technique, we calculate the electron-phonon energy relaxation rate in a conductor with the vibrating and static δ-correlated random electron-scattering potentials. If the scattering potential is completely dragged by phonons, this model yields the Schmid’s result for the inelastic electron-scattering rate τ−1e−ph. At low temperatures the effective interaction decreases due to disorder, and τ−1e−ph∝T4l (l is the electron mean-free path). In the presense of the static potential, quantum interference of numerous scattering processes drastically changes the effective electron-phonon interaction. In particular, at low temperatures the interaction increases, and τ−1e−ph∝T2/l. Along with an enhancement of the interaction, which is observed in disordered metallic films and semiconducting structures at low temperatures, the suggested model allows us to explain the strong sensitivity of the electron relaxation rate to the microscopic quality of a particular film. |
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0163-1829 |
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307 |
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Кардашев, Н. С.; Андреянов, В. В.; Буякас, В. И.; Виноградов, И. С.; Гвамичева, А. С.; Котик, А. И.; Курт, В. Г.; Лазарева, Г. С.; Миронова, Е. Н.; Мышонкова, Н. В.; Слыш, В. И.; Трубников, А. Г.; Троитский, В. Ф.; Пуряев, Д. Т.; Юсюкин, В. И. |
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Проект Миллиметрон |
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2000 |
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Труды ФИАН им. Лебедева |
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228 |
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RPLAB @ s @ MILLIMETRON_first_rus |
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309 |
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Hansen, Lene; Jørgensen, H.E.; Nørgaard-Nielsen, Hans Ulrik; Pedersen, Kenneth; Goudfrooij, P.; Linden-Vornle, M.J.D. |
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Title |
ISO far-infrared observations of rich galaxy clusters III. Abell 2029, Abell 2052, Abell 2142 |
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Journal Article |
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2000 |
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Astron. Astrophys. |
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A&A |
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362 |
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1 |
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133-137 |
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A sample of five rich galaxy clusters has been mapped by ISO at 60 μm, 100 μm, 135 μm, and 200 μm using the PHT-C camera. In previous papers Abell 2670 and Sersic 159-03 were discussed. Here we present the results for Abell 2029, Abell 2052, and Abell 2142. The conclusion of the survey is that the relatively small fields (approximate to 60 square are minutes) are structured with filaments or superpositions of point sources. In some cases point sources (approximate to 0.1 Jy) can be identified with cluster galaxies. An attempt to demonstrate infrared emission from dust in the cooling flows (due to star formation) was inconclusive. |
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456 |
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Wright, E. L.; Reese, E. D. |
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Detection of the cosmic infrared background at 2.2 and 3.5 microns using DIRBE observations |
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2000 |
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Astrophys. J. |
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545 |
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1 |
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43-55 |
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IR applications |
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0004-637X |
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