Fisica General Alvarenga Pdf
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the current study investigates the influence of short-range structural disorder on the magnetotransport properties of a quasi-1d bi(1.8)se(4) narrow nanoribbon structure, which is realized with the help of the breath-figure multilayer method. such disorder induced by the random deposition of hexagonal bismuth and selenium atoms on bi(1.8)se(4) nanoribbons is modeled by means of the monte carlo method. the magnetoresistance and hall voltage of bi(1.8)se(4) nanoribbons with different degrees of disorder are computed. it has been shown that the diffusive transport regime may well be realized in the presence of random disorder in quasi-1d nanostructures, as well as in the case of random disorder in the direction perpendicular to the quasi-1d nanoribbon, provided that the nanoribbon thickness becomes sufficiently small. the hall curves obtained for the disordered bi(1.8)se(4) nanoribbons in the diffusive transport regime, are found to be linear in the magnetic field. this linearity, and the non-symmetry of the hall curve, which is associated with the charge carrier scattering in the disordered bi(1.8)se(4) system, is discussed, and it is shown that the sign of the transverse magnetoresistance in bi(1.8)se(4) quasi-1d nanoribbons strongly depends on the value of the random disorder. furthermore, it has been shown that the sign of the magnetoresistance and hall voltage may be controlled by the disorder magnitude, as well as by the nanoribbon geometry, as the hall voltage is found to be non-symmetric to the magnetic field, while the magnetoresistance exhibits a small maximum at the zero magnetic field, when the transport regime in the disordered bi(1.8)se(4) system strongly depends on the nanoribbon thickness. it has also been shown that the interplay of the disorder and the finite size effects in bi(1.8)se(4) nanoribbons produces a strong non-linear, non-monotonic behavior of the hall resistivity, related to the energy spectrum dependence on the magnetic field. the theoretical results of this study are compared with the experimental data available for bi(1.8)se(4) nanoribbons deposited on a sio2 substrate by means of the breath-figure multilayer method. the theoretical results show good qualitative agreement with the experimental data, provided the values of the diffusion coefficient and the energy gap of bi(1.8)se(4) obtained from the comparison of the experimental data and our theoretical calculations are used in the comparison. furthermore, the energy spectrum of the disordered bi(1.8)se(4) system, which is calculated for the parameters obtained for bi(1.8)se(4) nanoribbons, is shown to be in agreement with the experimental data. finally, the study of the properties of the bi(1.8)se(4) nanoribbons deposited on a highly doped silicon dioxide substrate by means of the breath-figure multilayer method is also presented, since their fabrication using the multilayer method is of significant importance, as demonstrated by the experimental study of bi(1. 3d9ccd7d82
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