Auflistung nach Schlagwort "gallium"

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  • Comparison between the compressibilities of the zero field and composite-fermion metallic states of the two-dimensional electron system 
    Dorozhkin, S.I.; Smet, J.H.; von Klitzing, K.; Umansky, V.; Haug, Rolf J.; Ploog, K. (College Park, MD : American Physical Society, 2001)
    We have studied the capacitance between a two-dimensional electron system and a gate of field-effect transistors, produced from three different wafers with a single remotely doped GaAs/AlxGa1-xAs heterojunction. In the ...
  • Impurity effects in quantum dots: Toward quantitative modeling 
    Räsänen, E.; Könemann, J.; Haug, Rolf J.; Puska, M.J.; Nieminen, R.M. (College Park, MD : American Physical Society, 2004)
    We have studied the single-electron transport spectrum of a quantum dot in GaAs/AlGaAs resonant tunneling device. The measured spectrum has irregularities indicating a broken circular symmetry. We model the system with an ...
  • Shot noise in resonant tunneling through a zero-dimensional state with a complex energy spectrum 
    Nauen, A.; Hohls, Frank; Könemann, J.; Haug, Rolf J. (College Park, MD : American Physical Society, 2004)
    We investigate the noise properties of a GaAs/AlxGa 1-xAs resonant-tunneling structure at bias voltages where the current characteristic is determined by single electron tunneling. We discuss the suppression of the shot ...
  • Shot noise in tunneling through a single quantum dot 
    Nauen, A.; Hohls, Frank; Maire, Niels; Pierz, Klaus; Haug, Rolf J. (College Park, MD : American Physical Society, 2004)
    We investigate the noise properties of a zero-dimensional InAs quantum dot (QD) embedded in a GaAs-AlAs-GaAs tunneling structure. We observe an approximately linear dependence of the Fano factor and the current as a function ...