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  • 1
    Electronic Resource
    Electronic Resource
    Subnanosecond far infrared photoconductivity from a GaAs/AlGaAs multiquantum well (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 1913-1915 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: The far infrared (FIR) photoconductivity of GaAs/AlGaAs multiquantum wells (MQWs) doped with silicon has been investigated. The spectral response is consistent with extrinsic photoconductivity from shallow donors with an effective Rydberg of approximately 10.5 meV. The time-resolved photoconductivity due to stimulation with a cavity-dump FIR laser is measured. Subnanosecond rise and decay times are implied for the MQWs investigated; these times are shorter than for the corresponding bulk cases. Possible effects of geometric confinement on recombination rates are discussed. For a 150-period MQW, the responsivity at 118 μm is approximately 105 V W−1 .
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.346582
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  • 2
    Electronic Resource
    Electronic Resource
    Generation of very short far-infrared pulses by cavity dumping a molecular gas laser (1990)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 68 (1990), S. 3729-3731 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Very short far-infrared (FIR) pulses have been generated by cavity dumping an optically pumped molecular gas laser using optical switching techniques. The active element used is an intracavity semiconductor, which is placed under the Brewster angle with respect to the optical axes. This element is made highly reflective by the sudden increase of the free-carrier concentration, induced by above band-gap illumination. In this way high power (∝1 kW) FIR pulses with a duration less than 10 ns can be produced.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.347167
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  • 3
    Electronic Resource
    Electronic Resource
    A sensitive broadband high-frequency electron spin resonance/electron nuclear double resonance spectrometer operating at 5–7.5 mm wavelength (1998)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 69 (1998), S. 1817-1822 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A novel high-frequency electron spin resonance (ESR) spectrometer is described. The features are high sensitivity, a continuously tunable operating frequency of 40–60 GHz, a cylindrical cavity with a novel coupling scheme, and simultaneous detection of absorption and dispersion. A radio frequency coil can be integrated into the cavity for electron nuclear double resonance (ENDOR) experiments. ESR and ENDOR spectra of a test sample are presented in order to demonstrate in particular the scientific potential of a variable-frequency spectrometer. © 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1148847
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  • 4
    Electronic Resource
    Electronic Resource
    Bimorph stepping motor for point-contact experiments (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1347-1350 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A rotating piezoelectric device, which uses the so-called slip-stick mechanism for micropositioning is presented. The device is especially designed for use in point-contact experiments at very low temperatures in high magnetic fields. Two typical applications are presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1144091
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  • 5
    Electronic Resource
    Electronic Resource
    Dielectric Fabry–Pérot interferometer for temperature dependent far-infrared reflectivity measurements of heavy-fermion metals in high magnetic fields (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 4304-4310 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A far-infrared reflectivity set up has been developed for spectroscopy on highly reflective materials in a 20 T-class resistive Bitter magnet. As a first application, far-infrared reflectivity measurements on the heavy-fermion compound URu2Si2 have been performed using a silicon reflection Fabry–Pérot interferometer as a multiple reflection device. In a resonance, this Fabry–Pérot technique is one order of magnitude more sensitive than a single reflection measurement. Changes in the reflectivity as a function of magnetic field are resolved with an accuracy of 0.2% and the absolute value of the reflectivity can be obtained with an accuracy of 0.5%. With this interferometer, an excitation at about 40 cm−1 in the heavy-fermion system URu2Si2 is investigated at temperatures between 2 and 20 Kelvin and in magnetic fields up to 20 T. The excitation appears to extend to lower energies under influence of a large magnetic field. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1147530
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  • 6
    Electronic Resource
    Electronic Resource
    Versatile three-dimensional cryogenic micropositioning device (1996)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 67 (1996), S. 307-311 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A simple design for a mechanically driven three-dimensional cryogenic micropositioner is presented. The design is based on a parallelogram structure constructed from leaf springs and wires. Actuation is achieved by the elastic deformation of the parallelogram by screws. Positions within a volume of roughly (2 mm)3 are attainable. The precision and reproducibility of positioning are in the μm-range. The deviations from linearity are smaller than 10% for the whole working range and the deviation from orthogonality is smaller than 3°. Calibration measurements performed on a Cu-mesh with a lattice constant of 60 μm are presented. In an experiment investigating the ballistic transport of carriers in the semimetal Bi, two such devices are used. The first one is used as a scanning unit for an optical fiber and the second one is used as micropositioner for a Cu point contact. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146586
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  • 7
    Electronic Resource
    Electronic Resource
    High frequency electron nuclear double resonance at 239 GHz using a far-infrared laser source (1995)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 66 (1995), S. 5098-5099 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We report on the application of 14N electron nuclear double resonance (ENDOR) at 8.5 T and 239 GHz (λ=1.2 mm) in a γ-irradiated betaine arsenate single crystal. A laser was used as a far-infrared radiation source in a transmission-type electron paramagnetic resonance (EPR) setup without a cavity. The four expected nitrogen ENDOR lines were observed, but due to insufficient saturation of the EPR transitions the signal/noise ratio was not larger than 10 and the signals vanished at temperatures above 20 K. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1146136
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  • 8
    Electronic Resource
    Electronic Resource
    Principles and performance of a high-field time domain magnetic spectrometer (1993)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 64 (1993), S. 1853-1861 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: A time domain magnetic spectrometer based on a pick-up coil is presented for the study of spin-lattice relaxation rates in paramagnetic samples at high magnetic fields and at liquid-helium temperatures. The equilibrium between the spin system and the lattice is disturbed either by heating the spin system under the electron spin resonance condition (using far-infrared laser pulses) or by heating the lattice (using nonresonant laser pulses). Resulting magnetization changes induce a voltage in a pick-up coil oriented parallel to the field. By measuring the temporal evolution of this voltage, one can observe the spin-lattice relaxation directly. The spin-lattice relaxation in the diluted magnetic semiconductor CdMnTe is measured in order to demonstrate the performance of the spectrometer. The two methods of disturbing the equilibrium between the spin system and the lattice are compared.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1143968
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  • 9
    Electronic Resource
    Electronic Resource
    Nanometer-scale modification and characterization of lead-telluride surface by scanning tunneling microscope at 4.2 K (1996)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 79 (1996), S. 2435-2438 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Nanometer scale features on the semiconductor p-PbTe single crystal surface were created and studied at 4.2 K by means of a scanning tunneling microscope. Local tunneling spectra were obtained simultaneously with the surface topographic image. The local tunneling density of states and the magnetotransport data reveal the amorphous state of the modified regions on the surface. © 1996 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.361171
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  • 10
    Electronic Resource
    Electronic Resource
    Slow domains in semi-insulating GaAs in high magnetic fields (1995)
    [S.l.] : American Institute of Physics (AIP)
    Journal of Applied Physics 78 (1995), S. 5186-5188 
    Details
    ISSN: 1089-7550
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We report on the drastic effect of a transverse high magnetic field on the low-frequency current oscillations in semi-insulating GaAs at room temperature, related to the propagation of slow high-electric-field domains. At a critical magnetic field Bc, we find a sharp transition between two ranges of the domain drift velocity, indicating a substantial change in the behavior of the involved deep level. Bc depends linearly on the applied voltage. The amplitude of the current oscillations decreases with increasing magnetic field, which reflects the interaction between the latter and the contact region. © 1995 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.359755
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