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Author Yang, Y.; Fedorov, G.; Shafranjuk, S. E.; Klapwijk, T. M.; Cooper, B. K.; Lewis, R. M.; Lobb, C. J.; Barbara, P. url  doi
openurl 
  Title Electronic transport and possible superconductivity at Van Hove singularities in carbon nanotubes Type Journal Article
  Year 2015 Publication Nano Lett. Abbreviated Journal Nano Lett.  
  Volume 15 Issue (up) 12 Pages 7859-7866  
  Keywords carbon nanotubes, CNT, tunable superconductivity, van Hove singularities  
  Abstract Van Hove singularities (VHSs) are a hallmark of reduced dimensionality, leading to a divergent density of states in one and two dimensions and predictions of new electronic properties when the Fermi energy is close to these divergences. In carbon nanotubes, VHSs mark the onset of new subbands. They are elusive in standard electronic transport characterization measurements because they do not typically appear as notable features and therefore their effect on the nanotube conductance is largely unexplored. Here we report conductance measurements of carbon nanotubes where VHSs are clearly revealed by interference patterns of the electronic wave functions, showing both a sharp increase of quantum capacitance, and a sharp reduction of energy level spacing, consistent with an upsurge of density of states. At VHSs, we also measure an anomalous increase of conductance below a temperature of about 30 K. We argue that this transport feature is consistent with the formation of Cooper pairs in the nanotube.  
  Address Department of Physics, Georgetown University , Washington, District of Columbia 20057, United States  
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  ISSN 1530-6984 ISBN Medium  
  Area Expedition Conference  
  Notes PMID:26506109; Suuplementary info (attached to pdf) DOI: 10.1021/acs.nanolett.5b02564 Approved no  
  Call Number Serial 1782  
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Author Dorenbos, S. N.; Reiger, E. M.; Perinetti, U.; Zwiller, V.; Zijlstra, T.; Klapwijk, T. M. url  doi
openurl 
  Title Low noise superconducting single photon detectors on silicon Type Journal Article
  Year 2008 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.  
  Volume 93 Issue (up) 13 Pages 131101  
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  ISSN 0003-6951 ISBN Medium  
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  Notes Approved no  
  Call Number RPLAB @ s @ Serial 436  
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Author Shcherbatenko, M.; Tretyakov, I.; Lobanov, Yu.; Maslennikov, S. N.; Kaurova, N.; Finkel, M.; Voronov, B.; Goltsman, G.; Klapwijk, T. M. doi  openurl
  Title Nonequilibrium interpretation of DC properties of NbN superconducting hot electron bolometers Type Journal Article
  Year 2016 Publication Appl. Phys. Lett. Abbreviated Journal  
  Volume 109 Issue (up) 13 Pages 132602  
  Keywords HEB mixer, contacts  
  Abstract We present a physically consistent interpretation of the dc electrical properties of niobiumnitride (NbN)-based superconducting hot-electron bolometer mixers, using concepts of nonequilibrium superconductivity. Through this, we clarify what physical information can be extracted from the resistive transition and the dc current-voltage characteristics, measured at suitably chosen temperatures, and relevant for device characterization and optimization. We point out that the intrinsic spatial variation of the electronic properties of disordered superconductors, such as NbN, leads to a variation from device to device.  
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  Notes Approved no  
  Call Number Serial 1107  
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Author Ganzevles, W. F. M.; Gao, J. R.; de Korte, P. A. J.; Klapwijk, T. M. url  doi
openurl 
  Title Direct response of microstrip line coupled Nb THz hot-electron bolometer mixers Type Journal Article
  Year 2001 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.  
  Volume 79 Issue (up) 15 Pages 2483-2485  
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  ISSN 0003-6951 ISBN Medium  
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  Notes Approved no  
  Call Number Serial 311  
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Author Heslinga, D. R.; Shafranjuk, S. E.; van Kempen, H.; Klapwijk, T. M. url  doi
openurl 
  Title Observation of double-gap-edge Andreev reflection at Si/Nb interfaces by point-contact spectroscopy Type Journal Article
  Year 1994 Publication Phys. Rev. B Abbreviated Journal Phys. Rev. B  
  Volume 49 Issue (up) 15 Pages 10484-10494  
  Keywords Nb, Si, Nb-Si, Nb/Si, Si/Nb, Andreev reflection, point-contact spectroscopy  
  Abstract Andreev reflection point-contact spectroscopy is performed on a bilayer consisting of 50-nm degenerately doped Si backed with Nb. Due to the short mean free path both injection into and transport across the Si layer are diffusive, in contrast to the ballistic conditions prevailing in clean metal layers. Nevertheless a large Andreev signal is observed in the point-contact characteristics, not reduced by elastic scattering in the Si layer or by interface scattering, but only limited by the transmission coefficient of the metal-semiconductor point contact. Two peaks in the Andreev reflection probability are visible, marking the values of the superconducting energy gap at the interface on the Nb and Si sides. This interpretation is supported by a method of solving the Bogolubov equations analytically using a simplified expression for the variation of the order parameter close to the interface. This observation enables a comparison with theoretical predictions of the gap discontinuity in the proximity effect. It is found that the widely used de Gennes model does not agree with the experimental data.  
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  Publisher American Physical Society Place of Publication Editor  
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  Notes Approved no  
  Call Number Serial 1005  
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Author Baselmans, J. J. A.; Baryshev, A.; Reker, S. F.; Hajenius, M.; Gao, J. R.; Klapwijk, T. M.; Vahtomin, Yu.; Maslennikov, S.; Antipov, S.; Voronov, B.; Gol'tsman, G. doi  openurl
  Title Direct detection effect in small volume hot electron bolometer mixers Type Journal Article
  Year 2005 Publication Appl. Phys. Lett. Abbreviated Journal Appl. Phys. Lett.  
  Volume 86 Issue (up) 16 Pages 163503 (1 to 3)  
  Keywords HEB, mixer, direct detection effect  
  Abstract We measure the direct detection effect in a small volume (0.15μm×1μm×3.5nm)(0.15μm×1μm×3.5nm) quasioptical NbN phonon cooled hot electronbolometermixer at 1.6THz1.6THz. We find that the small signal sensitivity of the receiver is underestimated by 35% due to the direct detection effect and that the optimal operating point is shifted to higher bias voltages when using calibration loads of 300K300K and 77K77K. Using a 200GHz200GHzbandpass filter at 4.2K4.2K the direct detection effect virtually disappears. This has important implications for the calibration procedure of these receivers in real telescope systems.  
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  Notes Approved no  
  Call Number Serial 377  
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Author Coumou, P. C. J. J.; Driessen, E. F. C.; Bueno, J.; Chapelier, C.; Klapwijk, T. M. url  doi
openurl 
  Title Electrodynamic response and local tunneling spectroscopy of strongly disordered superconducting TiN films Type Journal Article
  Year 2013 Publication Phys. Rev. B Abbreviated Journal  
  Volume 88 Issue (up) 18 Pages 180505 (1 to 5)  
  Keywords strongly disordered superconducting TiN films, microwave resonators  
  Abstract We have studied the electrodynamic response of strongly disordered superconducting TiN films using microwave resonators, where the disordered superconductor is the resonating element in a high-quality superconducting environment of NbTiN. We describe the response assuming an effective pair-breaking mechanism modifying the density of states and compare this to local tunneling spectra obtained using scanning tunneling spectroscopy. For the least disordered film (kFl=8.7, Rs=13Ω), we find good agreement, whereas for the most disordered film (kFl=0.82, Rs=4.3kΩ), there is a strong discrepancy, which signals the breakdown of a model based on uniform properties.  
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  Notes Approved no  
  Call Number Serial 1069  
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Author Fedorov, G.; Kardakova, A.; Gayduchenko, I.; Charayev, I.; Voronov, B.M.; Finkel, M.; Klapwijk, T.M.; Morozov, S.; Presniakov, M.; Bobrinetskiy, I.; Ibragimov, R.; Goltsman, G. url  doi
openurl 
  Title Photothermoelectric response in asymmetric carbon nanotube devices exposed to sub-terahertz radiation Type Journal Article
  Year 2013 Publication Appl. Phys. Lett. Abbreviated Journal Appl. Phys. Lett.  
  Volume 103 Issue (up) 18 Pages 181121 (1 to 5)  
  Keywords carbon nanotubes, CNT, THz radiation, SiO2 substrate  
  Abstract We report on the voltage response of carbon nanotube devices to sub-terahertz (THz) radiation. The devices contain carbon nanotubes (CNTs), which are over their length partially suspended and partially Van der Waals bonded to a SiO2 substrate, causing a difference in thermal contact. We observe a DC voltage upon exposure to 140 GHz radiation. Based on the observed gate voltage and power dependence, at different temperatures, we argue that the observed signal is both thermal and photovoltaic. The room temperature responsivity in the microwave to THz range exceeds that of CNT based devices reported before. Authors thank Professor P. Barbara for providing the catalyst for CNT growth and Dr. N. Chumakov and V. Rylkov for stimulating discussions. The work was supported by the RFBR (Grant No. 12-02-01291-a) and by the Ministry of Education and Science of the Russian Federation (Contract No. 14.B25.31.0007). G.F. acknowledges support of the RFBR grant 12-02-01005-a.  
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  ISSN 0003-6951 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1171  
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Author Floet, D. Wilms; Baselmans, J. J. A.; Klapwijk, T. M.; Gao, J. R. url  doi
openurl 
  Title Resistive transition of niobium superconducting hot-electron bolometer mixers Type Journal Article
  Year 1998 Publication Applied Physics Letters Abbreviated Journal Appl. Phys. Lett.  
  Volume 73 Issue (up) 19 Pages 2826  
  Keywords HEB  
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  ISSN 0003-6951 ISBN Medium  
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  Notes Approved no  
  Call Number Serial 543  
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Author Baselmans, J. J. A.; Hajenius, M.; Gao, J. R.; Baryshev, A.; Kooi, J.; Klapwijk, T. M.; Voronov, B.; de Korte, P.; Gol'tsman, G. url  doi
openurl 
  Title NbN hot electron bolometer mixers: sensitivity, LO power, direct detection and stability Type Journal Article
  Year 2005 Publication IEEE Trans. Appl. Supercond. Abbreviated Journal IEEE Trans. Appl. Supercond.  
  Volume 15 Issue (up) 2 Pages 484-489  
  Keywords HEB mixers, direct detection effect, stability, Allan variance  
  Abstract We demonstrate that the performance of NbN lattice cooled hot electron bolometer mixers depends strongly on the interface quality between the bolometer and the contact structure. Both the receiver noise temperature and the gain bandwidth can be improved by a factor of 2 by cleaning the interface and adding an additional superconducting interlayer to the contact pad. Using this we obtain a double sideband receiver noise temperature of 950 K at 2.5 THz and 4.3 K, using a 0.4/spl times/4 /spl mu/m HEB mixer with a spiral antenna. At the same bias point, we obtain an IF gain bandwidth of 6 GHz. To comply with current demands on THz mixers for use in space based receivers we reduce the device size to 0.15/spl times/1 /spl mu/m and use a twin slot antenna. We report measurements of the noise temperature, LO power requirement, stability and the direct detection effect, using a mixer with a 1.6 THz twin slot antenna and a 1.462 THz solid state LO source with calibrated output power.  
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  ISSN 1051-8223 ISBN Medium  
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  Notes Approved no  
  Call Number Serial 546  
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