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      Formation of quantum structures on a single nanotube by modulating hydrogen adsorption

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      Author
      Gülseren, O.
      Yildirim, T.
      Çıracı, Salim
      Date
      2003
      Source Title
      Physical Review B - Condensed Matter and Materials Physics
      Print ISSN
      0163-1829
      Publisher
      American Physical Society
      Volume
      68
      Issue
      11
      Pages
      1154191 - 1154196
      Language
      English
      Type
      Article
      Item Usage Stats
      133
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      80
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      Abstract
      Using first-principles density functional calculations we showed that quantum structures can be generated on a single carbon nanotube by modulating the adsorption of hydrogen atoms. The band gap of the hydrogen-free zone of the tube widens in the adjacent hydrogen covered zone. The sudden variation of the band gap leads to band offsets at the conduction- and valence-band edges. At the end, the band gap of the whole system is modulated along the axis of the tube, which generates quantum wells or quantum dots. Specific electronic states are confined in these quantum wells. The type and radius of the nanotube and the extent and sequence of hydrogen-free and hydrogen-covered zones can provide several options to design a desired optoelectronic nanodevice.
      Keywords
      Carbon
      Hydrogen
      Adsorption
      Article
      Calculation
      Electronics
      Energy
      Hydrogenation
      Model
      Nanotechnology
      Nanotube
      Quantum dot
      Quantum mechanics
      Quantum structure
      Quantum well
      Single wall carbon nanotube
      Permalink
      http://hdl.handle.net/11693/24438
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      • Department of Physics 2299
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