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Author | Anthore, A.; Pothier, H.; Esteve, D. | ||||
Title | Density of states in a superconductor carrying a supercurrent | Type | Journal Article | ||
Year | 2003 | Publication | Phys. Rev. Lett. | Abbreviated Journal | Phys. Rev. Lett. |
Volume | 90 | Issue | 12 | Pages | 127001 (1 to 4) |
Keywords | Usadel, superconducting nanowire | ||||
Abstract | We have measured the tunneling density of states (DOS) in a superconductor carrying a supercurrent or exposed to an external magnetic field. The pair correlations are weakened by the supercurrent, leading to a modification of the DOS and to a reduction of the gap. As predicted by the theory of superconductivity in diffusive metals, we find that this effect is similar to that of an external magnetic field. | ||||
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Notes | Recommended by Klapwijk | Approved | no | ||
Call Number | Serial | 924 | |||
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Author | Romijn, J.; Klapwijk, T. M.; Renne, M. J.; Mooij, J. E. | ||||
Title | Critical pair-breaking current in superconducting aluminum strips far below Tc | Type | Journal Article | ||
Year | 1982 | Publication | Phys. Rev. B | Abbreviated Journal | Phys. Rev. B |
Volume | 26 | Issue | 7 | Pages | 3648-3655 |
Keywords | superconducting nanowire | ||||
Abstract | Critical currents of narrow, thin aluminum strips have been measured as a function of temperature. For the smallest samples uniformity of the current density is obtained over a large temperature range. Hence the intrinsic limit on the currentcarrying capacity of the superconductor was measured outside the Ginzburg-Landau -regime. The experimental values are compared with recent theoretical predictions by Kupriyanov and Lukichev. An approximate method of solving their equations is given, the results of which agree with the exact solution to within 1%. Experimental data are in excellent agreement with theoretical predictions. The absolute values agree if one assumes a Ïl value of 4×10–16 Ωm2 with vF=1.3×106 m/s. This value for Ïl is the same as that found from measurements of the anomalous skin effect but differs from values extracted from size-effect-limited resistivity. | ||||
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Notes | Recommended by Klapwijk | Approved | no | ||
Call Number | Serial | 925 | |||
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Author | Sahu, Mitrabhanu; Bae, Myung-Ho; Rogachev, Andrey; Pekker, David; Wei, Tzu-Chieh; Shah, Nayana; Goldbart, Paul M.; Bezryadin, Alexey | ||||
Title | Individual topological tunnelling events of a quantum field probed through their macroscopic consequences | Type | Journal Article | ||
Year | 2009 | Publication | Nature Phys. | Abbreviated Journal | Nature Phys. |
Volume | 5 | Issue | Pages | 503-508 | |
Keywords | phase slips, superconducting nanowires | ||||
Abstract | Phase slips are topological fluctuations that carry the superconducting order-parameter field between distinct current-carrying states. Owing to these phase slips, superconducting nanowires acquire electrical resistance. In such wires, it is well known that at higher temperatures phase slips occur through the process of thermal barrier-crossing by the order-parameter field. At low temperatures, the general expectation is that phase slips should proceed through quantum tunnelling events, which are known as quantum phase slips. However, resistive measurements have produced evidence both for and against the occurrence of quantum phase slips. Here, we report evidence for the observation of individual quantum phase-slip events in homogeneous ultranarrow wires at high bias currents. We accomplish this through measurements of the distribution of switching currents for which the width exhibits a rather counter-intuitive, monotonic increase with decreasing temperature. Importantly, measurements show that in nanowires with larger critical currents, quantum fluctuations dominate thermal fluctuations up to higher temperatures. | ||||
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Notes | Recommended by Klapwijk | Approved | no | ||
Call Number | Serial | 928 | |||
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Author | Ovchinnikov, Yu. N.; Varlamov, A. A. | ||||
Title | Fluctuation-dissipative phenomena in a narrow superconducting channel carrying current below critical | Type | Journal Article | ||
Year | 2009 | Publication | arXiv | Abbreviated Journal | |
Volume | 0910.2659v1 | Issue | Pages | 1-4 | |
Keywords | superconducting nanowire, resistance calculation | ||||
Abstract | The theory of current transport in a narrow superconducting channel accounting for thermal fluctuations is developed. These fluctuations result in the appearance of small but finite dissipation in the sample. The value of corresponding voltage is found as the function of temperature (close to transition temperature) and arbitrary bias current. It is demonstrated that the value of the activation energy (exponential factor in the Arrenius law) when current approaches to the critical one is proportional to (1-J/Jc)^(5/4). This result is in concordance with the one for the affine phenomenon of the Josephson current decay due to the thermal phase fluctuations, where the activation energy proportional (1-J/J_c)^(3/2)(the difference in the exponents is related to the additional current dependence of the order parameter). Found dependence of the activation energy on current explains the enormous discrepancy between the theoretically predicted before and the experimentally observed broadening of the resistive transition. | ||||
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Notes | arXiv:0910.2659v1; 4 pages, 3 figures | Approved | no | ||
Call Number | Serial | 931 | |||
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Author | Korneeva, Yuliya; Florya, Irina; Vdovichev, Sergey; Moshkova, Mariya; Simonov, Nikita; Kaurova, Natalia; Korneev, Alexander; Goltsman, Gregory | ||||
Title | Comparison of hot-spot formation in NbN and MoN thin superconducting films after photon absorption | Type | Conference Article | ||
Year | 2017 | Publication | IEEE Transactions on Applied Superconductivity | Abbreviated Journal | IEEE Transactions on Applied Superconductiv |
Volume | 27 | Issue | 4 | Pages | 5 |
Keywords | Thin film devices, Superconducitng photoncounting devices, Nanowire single-photon detectors | ||||
Abstract | In superconducting single-photon detectors SSPD the efficiency of local suppression of superconductivity and hotspot formation is controlled by diffusivity and electron-phonon interaction time. Here we selected a material, 3.6-nm-thick MoNx film, which features diffusivity close to those of NbN traditionally used for SSPD fabrication, but with electron-phonon interaction time an order of magnitude larger. In MoNx detectors we study the dependence of detection efficiency on bias current, photon energy, and strip width and compare it with NbN SSPD. We observe non-linear current-energy dependence in MoNx SSPD and more pronounced plateaus in dependences of detection efficiency on bias current which we attribute to longer electronphonon interaction time. |
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Notes | Approved | no | |||
Call Number | RPLAB @ kovalyuk @ | Serial | 1114 | ||
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Author | Arutyunov, K. Y.; Ramos-Alvarez, A.; Semenov, A. V.; Korneeva, Y. P.; An, P. P.; Korneev, A. A.; Murphy, A.; Bezryadin, A.; Gol'tsman, G. N. | ||||
Title | Superconductivity in highly disordered NbN nanowires | Type | Journal Article | ||
Year | 2016 | Publication | Nanotechnol. | Abbreviated Journal | Nanotechnol. |
Volume | 27 | Issue | 47 | Pages | 47lt02 (1 to 8) |
Keywords | NbN nanowires | ||||
Abstract | The topic of superconductivity in strongly disordered materials has attracted significant attention. These materials appear to be rather promising for fabrication of various nanoscale devices such as bolometers and transition edge sensors of electromagnetic radiation. The vividly debated subject of intrinsic spatial inhomogeneity responsible for the non-Bardeen-Cooper-Schrieffer relation between the superconducting gap and the pairing potential is crucial both for understanding the fundamental issues of superconductivity in highly disordered superconductors, and for the operation of corresponding nanoelectronic devices. Here we report an experimental study of the electron transport properties of narrow NbN nanowires with effective cross sections of the order of the debated inhomogeneity scales. The temperature dependence of the critical current follows the textbook Ginzburg-Landau prediction for the quasi-one-dimensional superconducting channel I c approximately (1-T/T c)(3/2). We find that conventional models based on the the phase slip mechanism provide reasonable fits for the shape of R(T) transitions. Better agreement with R(T) data can be achieved assuming the existence of short 'weak links' with slightly reduced local critical temperature T c. Hence, one may conclude that an 'exotic' intrinsic electronic inhomogeneity either does not exist in our structures, or, if it does exist, it does not affect their resistive state properties, or does not provide any specific impact distinguishable from conventional weak links. | ||||
Address | National Research University Higher School of Economics, Moscow Institute of Electronics and Mathematics,109028, Moscow, Russia. P L Kapitza Institute for Physical Problems RAS, Moscow, 119334, Russia | ||||
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Language | English | Summary Language | Original Title | ||
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ISSN | 0957-4484 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | PMID:27782000 | Approved | no | ||
Call Number | Serial | 1332 | |||
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Author | Елезов, М. С.; Щербатенко, М. Л.; Сыч, Д. В.; Гольцман, Г. Н. | ||||
Title | Практические особенности работы оптоволоконного квантового приемника Кеннеди | Type | Conference Article | ||
Year | 2019 | Publication | Proc. IWQO | Abbreviated Journal | Proc. IWQO |
Volume | Issue | Pages | 303-305 | ||
Keywords | Kennedy quantum receiver, fiber, quantum optics, standard quantum limit, superconducting nanowire single-photon detector, coherent detection | ||||
Abstract | Мы рассматриваем практические особенности работы квантового приемника на основе схемы Кеннеди, собранного из стандартных оптоволоконных элементов и сверхпроводникового детектора одиночных фотонов. Приемник разработан для различения двух фазовомодулированных когерентных состояний света на длине волны 1,5 микрона в непрерывном режиме с частотой модуляции 200 КГц и уровнем ошибок различения примерно в два раза ниже стандартного квантового предела. | ||||
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Language | Russian | Summary Language | Original Title | ||
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Notes | Duplicated as 1288 | Approved | no | ||
Call Number | Serial | 1283 | |||
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Author | Goltsman, G. | ||||
Title | Quantum-photonic integrated circuits | Type | Conference Article | ||
Year | 2019 | Publication | Proc. IWQO | Abbreviated Journal | Proc. IWQO |
Volume | Issue | Pages | 22-23 | ||
Keywords | WSSPD, waveguide SSPD, SNSPD, quantum optics, integrated optics, superconducting nanowire single-photon detector | ||||
Abstract | We show the design, a history of development as well as the most successful and promising approaches for QPICs realization based on hybrid nanophotonic-superconducting devices, where one of the key elements of such a circuit is a waveguide integrated superconducting single-photon detector (WSSPD). The potential of integration with fluorescent molecules is discussed also. | ||||
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Notes | Approved | no | |||
Call Number | Serial | 1287 | |||
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Author | Arutyunov, K. Y.; Ramos-Álvarez, A.; Semenov, A. V.; Korneeva, Y. P.; An, P. P.; Korneev, A. A.; Murphy, A.; Bezryadin, A.; Gol’tsman, G. N. | ||||
Title | Quasi-1-dimensional superconductivity in highly disordered NbN nanowires | Type | Miscellaneous | ||
Year | 2016 | Publication | arXiv | Abbreviated Journal | |
Volume | Issue | Pages | |||
Keywords | narrow NbN nanowires, BCS | ||||
Abstract | The topic of superconductivity in strongly disordered materials has attracted a significant attention. In particular vivid debates are related to the subject of intrinsic spatial inhomogeneity responsible for non-BCS relation between the superconducting gap and the pairing potential. Here we report experimental study of electron transport properties of narrow NbN nanowires with effective cross sections of the order of the debated inhomogeneity scales. We find that conventional models based on phase slip concept provide reasonable fits for the shape of the R(T) transition curve. Temperature dependence of the critical current follows the text-book Ginzburg-Landau prediction for quasi-one-dimensional superconducting channel Ic~(1-T/Tc)^3/2. Hence, one may conclude that the intrinsic electronic inhomogeneity either does not exist in our structures, or, if exist, does not affect their resistive state properties. | ||||
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Notes | Duplicated as 1332 | Approved | no | ||
Call Number | Serial | 1338 | |||
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Author | Peltonen, J. T.; Astafiev, O. V.; Korneeva, Y. P.; Voronov, B. M.; Korneev, A. A.; Charaev, I. M.; Semenov, A. V.; Golt'sman, G. N.; Ioffe, L. B.; Klapwijk, T. M.; Tsai, J. S. | ||||
Title | Coherent flux tunneling through NbN nanowires | Type | Journal Article | ||
Year | 2013 | Publication | Phys. Rev. B | Abbreviated Journal | Phys. Rev. B |
Volume | 88 | Issue | 22 | Pages | 220506 (1 to 5) |
Keywords | NbN nanowires | ||||
Abstract | We demonstrate evidence of coherent magnetic flux tunneling through superconducting nanowires patterned in a thin highly disordered NbN film. The phenomenon is revealed as a superposition of flux states in a fully metallic superconducting loop with the nanowire acting as an effective tunnel barrier for the magnetic flux, and reproducibly observed in different wires. The flux superposition achieved in the fully metallic NbN rings proves the universality of the phenomenon previously reported for InOx. We perform microwave spectroscopy and study the tunneling amplitude as a function of the wire width, compare the experimental results with theories, and estimate the parameters for existing theoretical models. | ||||
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ISSN | 1098-0121 | ISBN | Medium | ||
Area | Expedition | Conference | |||
Notes | Approved | no | |||
Call Number | Serial | 1369 | |||
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