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Author Gayduchenko, I. A.; Fedorov, G. E.; Stepanova, T. S.; Titova, N.; Voronov, B. M.; But, D.; Coquillat, D.; Diakonova, N.; Knap, W.; Goltsman, G. N. url  doi
openurl 
  Title Asymmetric devices based on carbon nanotubes as detectors of sub-THz radiation Type Conference Article
  Year 2016 Publication J. Phys.: Conf. Ser. Abbreviated Journal (up) J. Phys.: Conf. Ser.  
  Volume 741 Issue Pages 012143 (1 to 6)  
  Keywords carbon nanotubes, CNT  
  Abstract Demand for efficient terahertz (THz) radiation detectors resulted in intensive study of the asymmetric carbon nanostructures as a possible solution for that problem. In this work, we systematically investigate the response of asymmetric carbon nanodevices to sub-terahertz radiation using different sensing elements: from dense carbon nanotube (CNT) network to individual CNT. We conclude that the detectors based on individual CNTs both semiconducting and quasi-metallic demonstrate much stronger response in sub-THz region than detectors based on disordered CNT networks at room temperature. We also demonstrate the possibility of using asymmetric detectors based on CNT for imaging in the THz range at room temperature. Further optimization of the device configuration may result in appearance of novel terahertz radiation detectors.  
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  ISSN 1742-6588 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 1336  
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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 (up) Nano Lett.  
  Volume 15 Issue 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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  Series Volume Series Issue Edition  
  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 Kampfrath, Tobias; Perfetti, Luca; von Volkmann, Konrad; Aguirre, Carla M.; Desjardins, Patrick; Martel, Richard; Frischkorn, Christian; Wolf, Martin url  doi
openurl 
  Title Optical response of single-wall carbon nanotube sheets in the far-infrared spectral range from 1 THz to 40 THz Type Journal Article
  Year 2007 Publication Physica Status Solidi (B) Abbreviated Journal (up) Phys. Stat. Sol. (B)  
  Volume 244 Issue 11 Pages 3950-3954  
  Keywords single wall, carbon nanotube, SWNT, SWCNT, CNT, detector, sensor, TDS  
  Abstract The optical properties of single-wall carbon nanotube sheets in the far-infrared have been investigated with THz time-domain spectroscopy. Over a wide frequency range from 1 THz to 40 THz, the complex dielectric function of the nanotube sample has been derived. Our data can be excellently reproduced by a Drude-Lorentz model function. The extracted fit parameters such as Lorentz resonance frequency and plasma frequency are consistent with values obtained by scanning tunneling techniques. We discuss the origin of both the Lorentz and Drude contribution in terms of direct and indirect optical transitions.  
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  ISSN 0370-1972 ISBN Medium  
  Area Expedition Conference  
  Notes Approved no  
  Call Number Serial 569  
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Author Fedorov, G.; Gayduchenko, I.; Titova, N.; Gazaliev, A.; Moskotin, M.; Kaurova, N.; Voronov, B.; Goltsman, G. url  doi
openurl 
  Title Carbon nanotube based schottky diodes as uncooled terahertz radiation detectors Type Journal Article
  Year 2018 Publication Phys. Status Solidi B Abbreviated Journal (up) Phys. Status Solidi B  
  Volume 255 Issue 1 Pages 1700227 (1 to 6)  
  Keywords carbon nanotube schottky diodes, CNT  
  Abstract Despite the intensive development of the terahertz technologies in the last decade, there is still a shortage of efficient room‐temperature radiation detectors. Carbon nanotubes (CNTs) are considered as a very promising material possessing many of the features peculiar for graphene (suppression of backscattering, high mobility, etc.) combined with a bandgap in the carrier spectrum. In this paper, we investigate the possibility to incorporate individual CNTs into devices that are similar to Schottky diodes. The latter is currently used to detect radiation with a frequency up to 50 GHz. We report results obtained with semiconducting (bandgap of about 0.5 eV) and quasi‐metallic (bandgap of few meV) single‐walled carbon nanotubes (SWNTs). Semiconducting CNTs show better performance up to 300 GHz with responsivity up to 100 V W−1, while quasi‐metallic CNTs are shown to operate up to 2.5 THz.  
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  ISSN 0370-1972 ISBN Medium  
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  Notes Approved no  
  Call Number Serial 1321  
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Author Fedorov, G.; Kardakova, A.; Gayduchenko, I.; Voronov, B. M.; Finkel, M.; Klapwijk, T. M.; Goltsman, G. url  openurl
  Title Photothermoelectric response in asymmetric carbon nanotube devices exposed to sub-THz radiation Type Abstract
  Year 2014 Publication Proc. 25th Int. Symp. Space Terahertz Technol. Abbreviated Journal (up) Proc. 25th Int. Symp. Space Terahertz Technol.  
  Volume Issue Pages 71  
  Keywords carbon nanotubes, CNT  
  Abstract This work reports on the voltage response of asymmetric carbon nanotube devices to sub-THz radiation at the frequency of 140 GHz. The devices contain CNT’s, which are over their length partially suspended and partially Van der Waals bonded to a SiO 2 substrate, causing a difference in thermal contact. Different heat sinking of CNTs by source and drain gives rise to temperature gradient and consequent thermoelectric power (TEP) as such a device is exposed to the sub-THz radiation. Sign of the DC signal, its power and gate voltage dependence observed at room temperature are consistent with this scenario. At liquid helium temperature the observed response is more complex. DC voltage signal of an opposite sign is observed in a narrow range of gate voltages at low temperatures and under low radiation power. We argue that this may indicate a true photovoltaic response from small gap (less than 10meV) CNT’s, an effect never reported before. While it is not clear if the observed effects can be used to develop efficient THz detectors we note that the responsivity of our devices exceeds that of CNT based devices in microwave or THz range reported before at room temperature. Besides at 4.2 K notable increase of the sample conductance (at least four-fold) is observed. Our recent results with asymmetric carbon nanotube devices response to THz radiation (2.5 THz) will also be presented.  
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  Notes Approved no  
  Call Number Serial 1361  
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