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5
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0005028091
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edited by, I. E. Rashba, M. D. Sturge, North-Holland, Amsterdam
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(1982)
Excitons
, pp. 141-176
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Ivchenko, E.L.1
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17
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84927851213
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If the polarizer includes a plate with the circular birefrigence induced by external magnetic field (a Faraday cell), Πt and Π-t correspond to the reversed directions the field.
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18
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84927851212
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With an indefinite phase factor on the right-hand side of it, Eq. (18) follows from Eqs. (10) and (17). The choice of the phase factor can be justified by the analysis of a phase-sensitive measurement, when the sample is complemented with a semitransparent mirror, so that the sample and mirror comprise a Fabry-Pérot-type resonator. In this case the intensity of light emerging from the combined sample and mirror system is controlled by multiple reflection and is sensitive to the global phase of the reflectivity matrix of the sample. Applied to the combined system, Eq. (17) leads to Eq. (18).
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19
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84927851211
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For a low-symmetry crystal without the axes Cn, n >= 3, the R matrix has its general form given by Eq. (34) apart from R3= 0. The role of gyrotropy, i.e., the presence of the antisymmetric part of the dielectric tensor epsilon proportional to the wave vector, cannot be established by general arguments. One of the possibilities is that the gyrotropic transition takes place in an orthorhombic crystal and the symmetric part of epsilon remains to be diagonal in the same axes as in the high-symmetry phase. Then φ1 and φ2 in Eq. (34) are proportional to the gyrotropy (and εxx- εyy). However, the low symmetry does not guarantee the absence of a monoclinic distortion of the lattice, and does not fix the directions of the axes even when, by chance, the distortion is absent. Moreover, the real and imaginary symmetric parts of epsilon are generally diagonal in different axes. Therefore φ1, φ2, and φ1- φ2 may be finite without gyrotropy taken into account.
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24
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0025503194
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(1990)
Solid State Commun.
, vol.76
, pp. 511
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Weber, H.J.1
Weitbrecht, D.2
Brach, D.3
Shelankov, A.L.4
Keiter, H.5
Weber, W.6
Wolf, T.7
Geerk, I.8
Linker, G.9
Roth, G.10
Splittgerber-Hünnekes, P.S.11
Güntherodt, G.12
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27
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84927851209
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Equation (47) is valid only for the orientation of the sample where the angle φ2 in Eq. (39) is close to zero (or π / 2). This corresponds to the experimental conditions of Ref. 21.
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28
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84927851208
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More precisely, Eq. (49) gives a partial contribution to the total signal. The latter is the corresponding integral over the distribution of the frequency in the source of light.
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