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Terahertz-frequencies in semiconductor quantum wells are of interest due to the opportunity for making devices that operate at THz frequencies. In this study we present magnetotransport and magnetooptical data obtained in the magnetic field range 0 <; B <; 7T at QH detectors patterned as Corbino rings on AlInSb/InSb/AlInSb and HgCdTe/HgTe/HgCdTe quantum well wafers.
In this paper, we report on the observation of the QHE in gated epitaxial graphene films on SiC (0001), along with pronounced Shubnikov-de Haas (SdH) oscillations in magnetotransport. The last QH plateau is especially pronounced, even at temperatures as high as 70 K, reaching the temperature limit of the present experimental setup.
Giant anisotropic change of current in constant magnet field is observed in films of narrow band semiconductor PbSnTe:In. This phenomenon is considered with regard for ferroelectric properties in terms of the theory of space-charge-limited currents.
Development of new inorganic filler/polymer composites using external field is an important research field in material science. In this study, the effect of the eternal magnetic field applied during thermoforming processing of polyethylene (PE), carbon black (CB)/low-density polyethylene (LDPE), graphite/LDPE and carbon nanotubes(CNTs)/LDPE composites on their electrical conductivity properties is...
Gate-defined quantum devices in an InGaAs/InP heterostructure are achieved by introducing a HfO2 layer as the gate dielectric. The high-kappa layer is grown by atomic layer deposition and the fabrication process is described in detail. Electrical measurements at low temperature reveal the Coulomb blockade effect. Magnetotransport characterization is also carried out for the devices made from this...
Micro-photoluminescence in the presence of an external magnetic field is employed to study individual InAs/GaAs quantum dots (QDs). By varying the strength of the applied magnetic field, the charge state of the QD is tuned from a double negatively charged exciton to a neutral exciton. This effect is shown to be related to carrier transport in the QD-plane prior to capture into the QD. The temperature...
We present our results on the realization of ultra-sensitive and non-invasive magnetic sensors based on double-cross InSb Hall bars with dimensions down to 1.5 mum. Hall sensors were patterned from an epitaxial InSb film characterized by the carrier concentration of 3.9 times 1016 cm-3 and high carrier mobility of 1.3 m 2/Vs. We study noise characteristics and magnetotransport properties of Hall sensors...
Magnetotransport properties of the two-dimensional electron gas (2DEG) in the triangular quantum well at AlxGa1-xN/GaN heterointerfaces have been investigated by means of temperature dependent Shubnikov-de Haas (SdH) measurements at low temperatures and high magnetic fields under illumination. After the illumination of the heterostructures, the 2DEG concentration increases and the SdH oscillation...
Magnetotransport study has been performed on AlxGa1-xN/GaN heterostructures at low temperatures and high magnetic fields. The magneto-intersubband scattering effect of the two-dimensional electron gas (2DEG) has been observed in the triangular quantum well at the heterointerface. It is found that the effective mass of the 2DEG have strong dependence on the magnetic field and the 2DEG density due to...
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