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| Author |
Shurakov, A.; Mikhailov, D.; Belikov, I.; Kaurova, N.; Zilberley, T.; Prikhodko, A.; Voronov, B.; Vasil’evskii, I.; Goltsman, G. |
Title  |
Planar Schottky diode with a Γ-shaped anode suspended bridge |
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Conference Article |
| Year |
2020 |
Publication |
J. Phys.: Conf. Ser. |
Abbreviated Journal |
J. Phys.: Conf. Ser. |
| Volume |
1695 |
Issue |
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Pages |
012154 |
| Keywords |
Schottky diode, GaAs, InP substrate |
| Abstract |
In this paper we report on the fabrication of a planar Schottky diode utilizing a Г-shaped anode suspended bridge. The bridge maintains transition between the top and bottom level planes of a 1.4 µm thick GaAs mesa. To implement the profile of a suspended bridge and inward tilt of a mesa wall adjacent to it, we make use of an anisotropic etching of gallium arsenide. The geometry proposed enables the fabrication of a diode with mesa of an arbitrary thickness to mitigate AC losses in the diode layered structure at terahertz frequencies of interest. For frequencies beyond 1 THz, it is also beneficial to use the geometry for the implementation of n-GaAs/n-InGaAs heterojunction Schottky diodes grown on InP substrate. |
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1742-6588 |
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1152 |
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| Author |
Gershenzon, E.; Goltsman, G.; Orlov, L.; Ptitsina, N. |
| Title |
Population of excited-states of small admixtures in germanium |
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Conference Article |
| Year |
1978 |
Publication |
Izv. Akad. Nauk SSSR, Seriya Fizicheskaya |
Abbreviated Journal |
Izv. Akad. Nauk SSSR, Seriya Fizicheskaya |
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42 |
Issue |
6 |
Pages |
1154-1159 |
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Ge, excited states, admixtures |
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Mezhdunarodnaya Kniga 39 Dimitrova Ul., 113095 Moscow, Russia |
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1723 |
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Baeva, E.; Sidorova, M.; Korneev, A.; Goltsman, G. |
| Title |
Precise measurement of the thermal conductivity of superconductor |
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Conference Article |
| Year |
2018 |
Publication |
Proc. AIP Conf. |
Abbreviated Journal |
Proc. AIP Conf. |
| Volume |
1936 |
Issue |
1 |
Pages |
020003 (1 to 4) |
| Keywords |
NbN SSPD, SNSPD |
| Abstract |
Measuring the thermal properties such as the heat capacity provide information about intrinsic mechanisms operated inside. In general, the ratio between electron and phonon specific heat Ce/Cp shows how the absorbed energy shared between electron and phonon subsystems. In this work we make estimations for amplitude-modulated absorption of THz radiation technique for investigation of the ratio Ce/Cp in superconducting Niobium Nitride (NbN) at T = Tc. Our results indicates that experimentally the frequency of modulation has to be extra large to extract the quantity. We perform a new technique allowed to work at low frequency with accurately measurement of absorbed power. |
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doi:10.1063/1.5025441 |
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1311 |
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Beck, M.; Klammer, M.; Rousseau, I.; Gol’tsman, G. N.; Diamant, I.; Dagan, Y.; Demsar, J. |
| Title |
Probing superconducting gap dynamics with THz pulses |
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Conference Article |
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2015 |
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CLEO |
Abbreviated Journal |
CLEO |
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SM3H.3 (1 to 2) |
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superconducting gap; electric fields; femtosecond pulses; near infrared radiation; picosecond pulses; superconductors; thin films |
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We studied superconducting gap dynamics in a BCS superconductor NbN and electron doped cuprate superconductor PCCO following excitation with near-infrared (NIR) and narrow band THz pulses. Systematic studies on PCCO imply very selective electron-phonon coupling. |
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Optical Society of America |
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1345 |
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Ozhegov, R.; Elezov, M.; Kurochkin, Y.; Kurochkin, V.; Divochiy, A.; Kovalyuk, V.; Vachtomin, Y.; Smirnov, K.; Goltsman, G. |
| Title |
Quantum key distribution over 300 |
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Conference Article |
| Year |
2014 |
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Proc. SPIE |
Abbreviated Journal |
Proc. SPIE |
| Volume |
9440 |
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Pages |
1F (1 to 9) |
| Keywords |
SSPD, SNSPD applicatins, quantum key distribution, QKD |
| Abstract |
We discuss the possibility of polarization state reconstruction and measurement over 302 km by Superconducting Single- Photon Detectors (SSPDs). Because of the excellent characteristics and the possibility to be effectively coupled to singlemode optical fiber many applications of the SSPD have already been reported. The most impressive one is the quantum key distribution (QKD) over 250 km distance. This demonstration shows further possibilities for the improvement of the characteristics of quantum-cryptographic systems such as increasing the bit rate and the quantum channel length, and decreasing the quantum bit error rate (QBER). This improvement is possible because SSPDs have the best characteristics in comparison with other single-photon detectors. We have demonstrated the possibility of polarization state reconstruction and measurement over 302.5 km with superconducting single-photon detectors. The advantage of an autocompensating optical scheme, also known as “plugandplay” for quantum key distribution, is high stability in the presence of distortions along the line. To increase the distance of quantum key distribution with this optical scheme we implement the superconducting single photon detectors (SSPD). At the 5 MHz pulse repetition frequency and the average photon number equal to 0.4 we measured a 33 bit/s quantum key generation for a 101.7 km single mode ber quantum channel. The extremely low SSPD dark count rate allowed us to keep QBER at 1.6% level. |
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SPIE |
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Orlikovsky, A. A. |
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International Conference on Micro- and Nano-Electronics |
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RPLAB @ sasha @ ozhegov2014quantum |
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1048 |
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