Oscillatory magnetic states

Although the theory of the SdH effect [256], which deals with the detailed problem of electron scattering in a magnetic field, is quite complicated a qualitative explanation is possible by virtue of a simple argument [257]. The probability for an electron to scatter is proportional to the number of states into which it can be scattered. As discussed above, for a metal in a magnetic field the density of states at the Fermi level N ep) will oscillate with the field and, therefore, the scattering probability and the electronic relaxation time r will oscillate, too. It can be shown that the oscillatory part of the density of states, Niep), has essentially the same analytic form as (3.6) with the... 

K. Park, Radiation-induced zero-resistance state at low magnetic fields and near half-filling of the lowest Landau level, Phys. Rev. B 69, 201301 (2004) M. G. Vavilov et al.. Magnetotransport in a two-dimensional electron gas at large filling factors, Phys. Rev. B 69, 035303 (2004) I. A. Dmitriev et al.. Oscillatory ac conductivity and photoconductivity of a two-dimensional electron gas Quasiclassical transport beyond the Boltzmann equation, Phys. Rev. B 70, 165305 (2004) J. Inarrea and G. Platero, Theoretical approach to microwave-radiation-induced zero-resistance states in 2D electron systems, Phys. Rev. Lett. 94, 016806 (2005). 

A variety of unusual experimental schemes have been employed to detect perturbations and to characterize the perturbing state. The methods described in this section involve subjecting the molecule to external perturbations such as an intense monochromatic radiation field (Section 6.5.1), a static magnetic or electric field (Sections 6.5.2, 6.5.3 and 6.5.4), multiple static, oscillatory, or pulsed electromagnetic fields (Sections 6.5.2 and 6.5.3 ), weak bimolecular collisions (Section 6.5.5), or confining the molecule in a high pressure collisional (Section 6.5.6) or matrix (Section 6.5.7) cage. External perturbations can make observable extremely weak or exotic internal perturbations or can create intramolecular interactions that do not exist in the isolated molecule. 

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