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The small signal high frequency ac mobility of the hot electrons in n-HgCdTe and n-InSb has been calculated in the extreme quantum limit at low temperatures considering the non equilibrium phonon distribution as well as the thermal phonon distribution. The energy and the momentum losses of the...
A microscopic theory of transverse acoustic impedance of superfluid 3He is presented. We calculate the stress tensor of superfluid 3He as a response to the oscillating rough wall. For that purpose, we extend a quasi-classical theory with the random S-matrix model for the rough wall to time...
Electrical resistivities of several quasicrystalline (QC) icosahedral Al–Cu–Ru alloys have been measured between room temperature and mK temperatures. None of the Al–Cu–Ru samples exhibited “insulating” behaviors in their resistivities. One sample had a large resistivity of ≈49,000 μΩ cm at room...
We investigate rf SQUIDs (Superconducting QUantum Interference Devices), coupled to a resonant input circuit, a readout tank circuit and a preamplifier, by numerically solving the corresponding Langevin equations. The quantity of interest is the noise temperature T
. We use an analytical...
We investigate the characteristics and noise performance of rf Superconducting Quantum Interference Devices (SQUIDs) by solving the corresponding Langevin equations numerically and optimizing the model parameters with respect to noise energy. After introducing the basic concepts of the numerical...
We present new measurements of the specific heat C
of 4He confined in cylindrical micro-channels of diameter L=1.89 μm at saturated vapor pressure and near the bulk superfluid-transition temperature T
. The results, when combined with the specific-heat exponent α=−0.01264, and with the...
To understand the origins of synchronous and asynchronous phase slippages observed in an array of apertures connecting two reservoirs of superfluid 4He, we have investigated the role of thermal fluctuations in the critical velocity and the possible effects of having an array rather than a single...
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