Far-infrared-study of shallow etched quantum wires on high mobility heterostructures and quantum-wells
| Autor: | Gerhard Abstreiter, R. Strenz, G. Weimann, V. Roßkopf, G. Böhm, P. Auer, Erich Gornik |
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| Rok vydání: | 1996 |
| Předmět: |
Physics
Condensed matter physics Band gap Quantum wire Cyclotron resonance Heterojunction Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Electronic Optical and Magnetic Materials Far infrared Quantum dot Materials Chemistry Electrical and Electronic Engineering Quantum well Plasmon |
| Zdroj: | Solid-State Electronics. 40:333-337 |
| ISSN: | 0038-1101 |
| DOI: | 10.1016/0038-1101(95)00323-1 |
| Popis: | We report measurements of electronic excitations in the confinement regime between one and two dimensions. FIR transmission spectroscopy has been successfully used to detect two-dimensional plasmons dispersion, localized plasmons and depolarization shifted one-dimensional intersubband transitions. The far infrared response of arrays of periodic quantum wires has been investigated by cyclotron resonance transmission and photoconductivity (PC) measurements. Due to narrow geometrical dimensions (300 nm), quantum confinement arises and leads to the formation of one-dimensional electronic subbands with a typical energy separation of 1–3 meV in the case of the heterostructures, and up to 9 meV in the case of the quantum wells. The far infrared transmission spectra of the quantum wire structures show one strong resonance, which can be described by a harmonic oscillator model, assuming that the confining potential is of parabolic shape. Depending on the intensity of the bandgap illumination, a well pronounced transition from a one-dimensional electronic system behaviour to a modulated one-dimensional system and finally to a pure two-dimensional system can be achieved for the heterostructure samples. The position of the PC-peak can be assigned to the plasmon-shifted cyclotron resonance. In addition in the samples, which contain a low density (4 × 1010cm−2) and high mobility inversion channel, an extremely sharp line with a linewidth of 0.2 cm−1 can be observed, depending on the temperature and on the illumination of the samples. |
| Databáze: | OpenAIRE |
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