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• 1
Electronic Resource
Springer
Journal of experimental and theoretical physics 91 (2000), S. 1250-1260
ISSN: 1090-6509
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract Long-term resistance relaxations induced by uniaxial compression in (001)p-GaAs/Al0.5Ga0.5 As heterostructures are observed, and the main properties of these relaxations are investigated: the dependence of their character on the direction of the uniaxial compression, the change in concentration of current carriers during the relaxation processes, and the quenching of the relaxations by temperature, illumination, and high electric fields. It is found that the character of the relaxation process is different for compression directions [110] and $$[1\bar 10]$$ : in the first case the concentration of two-dimensional holes in the quantum well decreases in the course of the relaxation, while in the second case it increases. A model is proposed in which the cause of the relaxations of the piezoresistance and the anisotropic character of these relaxations is assumed to be the piezoelectric field, the value of which, according to estimates, is |E z| = 1.152 × 104 V/cm per kbar.
Type of Medium: Electronic Resource
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• 2
Electronic Resource
Springer
The European physical journal 73 (1989), S. 501-510
ISSN: 1434-6036
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract As the magnetic flux is increased (decreased) relative to the mid-plateau value by a given number of flux quanta, the 2-dimensional electron liquid responds by forming the same number of vortices (antivortices). Assuming the vortices (antivortices) to be pinned, we show that with a transport current flowing by, the pinning centres exert a force on the electron liquid. Inclusion of this force in a force balance equation for the electron liquid explains the formation of plateaus within the FQHE. The possibility of generalizing the theory to the IQHE is discussed.
Type of Medium: Electronic Resource
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• 3
Electronic Resource
Springer
Journal of low temperature physics 95 (1994), S. 481-496
ISSN: 1573-7357
Source: Springer Online Journal Archives 1860-2000
Topics: Physics
Notes: Abstract We describe the non-parabolicity of the electron dispersion in bismuth by the Lax model, which replaces the energy Eby E(1+E/EG), EG being the L-point energy gap. It is assumed that the effect of small strains can be accounted for solely by small changes of the electron and hole Fermi energies, dEF = σDjkejk,where Djk and ejk denote deformation potentials and strains. With this assumption we show that the deformation potentials come out the same whether the dispersion relation is non-parabolic or parabolic. This finding we use in a re-evaluation of the deformation potentials obtained from SdH-measurements under static strain. We further make a mass data correction of deformation potentials obtained from magnetoacoustic attenuation. The two sets of values so obtained are in excellent agreement. This allows us to improve the accuracy, and we recommend to use the following values (unit eV): for electrons: D11 = 2.74 ± 0.50, D22 = −7.38 ± 0.56, D33 = 2.17 ±0.25, D23 = −1.85 ± 0.44and for holes: D11 = −1.06 ± 0.27, D33 = −1.06 ± 0.09
Type of Medium: Electronic Resource
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