| Records |
| Author |
Beck, Matthias; Leiderer, Paul; Kabanov, Viktor V.; Gol'tsman, Gregory; Helm, Manfred; Demsar, Jure |
| Title |
Energy-gap dynamics of a superconductor NbN studied by time-resolved terahertz spectroscopy |
Type |
Abstract |
| Year |
2012 |
Publication |
INIS |
Abbreviated Journal |
INIS |
| Volume |
45 |
Issue  |
12 |
Pages |
1-3 |
| Keywords |
NbN energy gap |
| Abstract |
Using time-resolved terahertz (THz) spectroscopy we performed direct studies of the photoinduced suppression and recovery of the SC gap in a conventional SC NbN. Both processes are found to be strongly temperature and excitation density dependent. The analysis of the data with the established phenomenological Rothwarf-Taylor model enabled us to determine the important microscopic constants: the Cooper pair-breaking rate via phonon absorption and the bare quasiparticle recombination rate. From the latter we were able to extract the dimensionless electron-phonon coupling constant, λ=1.1±0.1, in excellent agreement with theoretical estimates. The technique also allowed us to determine the absorbed energy required to suppress SC, which in NbN equals the thermodynamic condensation energy (in cuprates the two differ by an order of magnitude). Finally, we present the first studies of dynamics following resonant excitation with intense narrow band THz pulses tuned to above and below the superconducting gap. These suggest an additional process, particularly pronounced near Tc, that could be attributed to amplification of SC via effective quasiparticle cooling. |
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no |
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1383 |
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| Author |
Tikhonov, V. V.; Polyakova, O. N.; Gol’tsman, G. N.; Dzardanov, A. L.; Boyarskiy, D. A. |
| Title |
Determination of dielectric properties of ore minerals in the microwave band |
Type |
Journal Article |
| Year |
2008 |
Publication |
Radiophys. Quant. Electron. |
Abbreviated Journal |
Radiophys. Quant. Electron. |
| Volume |
51 |
Issue |
12 |
Pages |
966-974 |
| Keywords |
ore complex permittivity, chalcopyrite, magnetite, sphalerite, labradorite |
| Abstract |
We consider a method for determining the complex dielectric permittivity of ore and nonmetal minerals in the microwave band of electromagnetic radiation. The results of measuring the reflectivity and transmittivity of chalcopyrite, magnetite, sphalerite, and labradorite samples in the frequency range 77–300 GHz are presented. A method for calculation of the complex dielectric permittivity of minerals on the basis of the obtained experimental data is proposed. The approximation formulas for calculation of the complex dielectric permittivity of the studied minerals are given. |
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0033-8443 |
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no |
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1404 |
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| Author |
Lipatov, A.; Okunev, O.; Smirnov, K.; Chulkova, G.; Korneev, A.; Kouminov, P.; Gol'tsman, G.; Zhang, J.; Slysz, W.; Verevkin, A.; Sobolewski, R. |
| Title |
An ultrafast NbN hot-electron single-photon detector for electronic applications |
Type |
Journal Article |
| Year |
2002 |
Publication |
Supercond. Sci. Technol. |
Abbreviated Journal |
Supercond. Sci. Technol. |
| Volume |
15 |
Issue |
12 |
Pages |
1689-1692 |
| Keywords |
NbN SSPD, SNSPD, QE, jitter, dark counts |
| Abstract |
We present the latest generation of our superconducting single-photon detector (SPD), which can work from ultraviolet to mid-infrared optical radiation wavelengths. The detector combines a high speed of operation and low jitter with high quantum efficiency (QE) and very low dark count level. The technology enhancement allows us to produce ultrathin (3.5 nm thick) structures that demonstrate QE hundreds of times better, at 1.55 μm, than previous 10 nm thick SPDs. The best, 10 × 10 μm2, SPDs demonstrate QE up to 5% at 1.55 μm and up to 11% at 0.86 μm. The intrinsic detector QE, normalized to the film absorption coefficient, reaches 100% at bias currents above 0.9 Ic for photons with wavelengths shorter than 1.3 μm. |
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0953-2048 |
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no |
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1533 |
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| Author |
Gerecht, E.; Musante, C. F.; Zhuang, Y.; Yngvesson, K. S.; Gol’tsman, G. N.; Voronov, B. M.; Gershenzon, E. M. |
| Title |
NbN hot electron bolometric mixerss—a new technology for low-noise THz receivers |
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Journal Article |
| Year |
1999 |
Publication |
IEEE Trans. Appl. Supercond. |
Abbreviated Journal |
IEEE Trans. Appl. Supercond. |
| Volume |
47 |
Issue |
12 |
Pages |
2519-2527 |
| Keywords |
NbN HEB mixers |
| Abstract |
New advances in hot electron bolometer (HEB) mixers have recently resulted in record-low receiver noise temperatures at terahertz frequencies. We have developed quasi-optically coupled NbN HEB mixers and measured noise temperatures up to 2.24 THz, as described in this paper. We project the anticipated future performance of such receivers to have even lower noise temperature and local-oscillator power requirement as well as wider gain and noise bandwidths. We introduce a proposal for integrated focal plane arrays of HEB mixers that will further increase the detection speed of terahertz systems. |
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1557-9670 |
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no |
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1560 |
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| Author |
Kawamura, J.; Blundell, R.; Tong, C.-yu E.; Gol’tsman, G.; Gershenzon, E.; Voronov, B.; Cherednichenko, S. |
| Title |
Low noise NbN lattice-cooled superconducting hot-electron bolometric mixers at submillimeter wavelengths |
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Journal Article |
| Year |
1997 |
Publication |
Appl. Phys. Lett. |
Abbreviated Journal |
Appl. Phys. Lett. |
| Volume |
70 |
Issue |
12 |
Pages |
1619-1621 |
| Keywords |
NbN HEB mixers |
| Abstract |
Lattice-cooled superconducting hot-electron bolometric mixers are used in a submillimeter-wave waveguide heterodyne receiver. The mixer elements are niobium nitride film with 3.5 nm thickness and ∼10 μm2 area. The local oscillator power for optimal performance is estimated to be 0.5 μW, and the instantaneous bandwidth is 2.2 GHz. At an intermediate frequency centered at 1.4 GHz with 200 MHz bandwidth, the double sideband receiver noise temperature is 410 K at 430 GHz. The receiver has been used to detect molecular line emission in a laboratory gas cell. |
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0003-6951 |
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no |
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Serial |
1599 |
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| Author |
Verevkin, A. A.; Ptitsina, N. G.; Chulcova, G. M.; Gol'Tsman, G. N.; Gershenzon, E. M.; Yngvesson, K. S. |
| Title |
Determination of the limiting mobility of a two-dimensional electron gas in AlxGa1-xAs/GaAs heterostructures and direct measurement of the energy relaxation time |
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Journal Article |
| Year |
1996 |
Publication |
Phys. Rev. B Condens. Matter. |
Abbreviated Journal |
Phys. Rev. B Condens. Matter. |
| Volume |
53 |
Issue |
12 |
Pages |
R7592-R7595 |
| Keywords |
2DEG, AlGaAs/GaAs heterostructures |
| Abstract |
We present results for a method to measure directly the energy relaxation time (τe) for electrons in a single AlxGa1−xAs/GaAs heterojunction; measurements were performed from 1.6 to 15 K under quasiequilibrium conditions. We find τeαT−1 below 4 K, and τe independent of T above 4 K. We have also measured the energy-loss rate, ⟨Q⟩, by the Shubnikov-de Haas technique, and find ⟨Q⟩α(T3e−T3) for T<~4.2 K; Te is the electron temperature. The values and temperature dependence of τe and ⟨Q⟩ for T<4 K agree with calculations based on piezoelectric and deformation potential acoustic phonon scattering. At 4.2 K, we can also estimate the momentum relaxation time, τm, from our measured τe. This leads to a preliminary estimate of the phonon-limited mobility at 4.2 K of μ=3×107 cm2/Vs (ns=4.2×1011 cm−2), which agrees well with published numerical calculations, as well as with an earlier indirect estimate based on measurements on a sample with much higher mobility. |
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0163-1829 |
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PMID:9982274 |
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no |
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1612 |
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| Author |
Gershenzon, E. M.; Gol'tsman, G. N.; Dzardanov, A. L.; Elant'ev, A. I.; Zorin, M. A.; Markin, A. G.; Semenov, A. D. |
| Title |
S-N switching of niobium and YBCO films: limit time and perspective of fast key element creation |
Type |
Journal Article |
| Year |
1992 |
Publication |
Sverkhprovodimost': Fizika, Khimiya, Tekhnika |
Abbreviated Journal |
Sverkhprovodimost': Fizika, Khimiya, Tekhnika |
| Volume |
5 |
Issue |
12 |
Pages |
2386-2402 |
| Keywords |
YBCO HTS switches |
| Abstract |
A study was made on processes of switching of thin niobium film strips between superconducting and normal states under the effect of optical radiation pulse and voltage step. The results are described satisfactorily by the model of spatial homogeneous electron heating. It is shown that limiting switching times can be equal to several shares of nanosecond at 4.2 K. Preliminary results for YBa2Cu3O-7-x films are presented. Prospects and advantages of creation of ducting structures of narrow streps, are discussed. |
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0131-5366 |
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no |
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1674 |
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Blagosklonskaya, L. E.; Gershenzon, E. M.; Gol’tsman, G. N.; Elant’ev, A. I. |
| Title |
Effect of a strong magnetic field on the spectrum of donors in InSb |
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Journal Article |
| Year |
1978 |
Publication |
Sov. Phys. Semicond. |
Abbreviated Journal |
Sov. Phys. Semicond. |
| Volume |
11 |
Issue |
12 |
Pages |
1395-1397 |
| Keywords |
InSb, spectrum of donors, strong magnetic field |
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no |
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1725 |
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Gershenzon, E.M.; Gol'tsman, G.N.; Ptitsyna, N. G. |
| Title |
Carrier lifetime in excited states of shallow impurities in germanium |
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Journal Article |
| Year |
1977 |
Publication |
JETP Lett. |
Abbreviated Journal |
JETP Lett. |
| Volume |
25 |
Issue |
12 |
Pages |
539-543 |
| Keywords |
Ge, shallow impurities, excited states |
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no |
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1726 |
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Blagosklonskaya, L. E.; Gershenzon, E. M.; Gol'tsman, G. N.; Elant'ev, A. I. |
| Title |
Effect of a high magnetic field on the spectrum of donors in InSb |
Type |
Journal Article |
| Year |
1977 |
Publication |
Fizika i Tekhnika Poluprovodnikov |
Abbreviated Journal |
Fizika i Tekhnika Poluprovodnikov |
| Volume |
11 |
Issue |
12 |
Pages |
2373-2375 |
| Keywords |
InSb, energy spectrum, donors, high magnetic field |
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Russian |
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Воздействие сильного магнитного поля на спектр доноров в InSb |
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1729 |
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