Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2008-10-07
Int.J.Mod.Phys.B25:1915-1929,2011
Physics
Condensed Matter
Disordered Systems and Neural Networks
15 pages, 6 figures. To appear in International journal of modern physics B
Scientific paper
10.1142/S0217979211100552
We study the magnetic field dependences of the conductivity in heavily doped, strongly disordered 2D quantum well structures within wide conductivity and temperature ranges. We show that the exact analytical expression derived in our previous paper [1], is in better agreement than the existing equation i.e. Hikami(et.al.,) expression [2,3], with the experimental data even in low magnetic field for which the diffusion approximation is valid. On the other hand from theoretical point of view we observe that our equation is also rich because it establishes a strong relationship between quantum corrections to the conductivity and the quantum symmetry su_{q}(2). It is shown that the quantum corrections to the conductivity is the trace of Green function made by a generator of su_{q}(2)algebra. Using this fact we show that the quantum corrections to the conductivity can be expressed as a sum of an infinite number of Feynman diagrams.
Alavi S. A.
Tatar A.
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