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An exact one-particle-irreducible renormalization-group generator for critical phenomena is derived by an infinitesimal saddle-point expansion. This replaces the usual field-theoretic loop-expansion for the free energy and Green's functions with an explicit differential equation. 相似文献
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R. Mark Nicoll Sally A. Hindle Grant MacKenzie Ian H. Hillier Neil A. Burton 《Theoretical chemistry accounts》2001,106(1-2):105-112
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Inhomogeneous broadening of resonance lines causes a reduction of absorption in nuclear resonance experiments. This is particularly devastating to the observation of the Mössbauer effect in isomers like 107Ag with a half-life of 44s.It has been suggested in the literature that homogeneous broadening can provide overlap of resonance lines and thus theMössbauer effect can be recovered. The analysis presented in this paper shows that this is not the case for Mössbauer experiments, unless the radiative width ΓΓ also increases. Although overlap occurs when the lines are homogeneously broadened to a total width Γ_H which exceeds the natural width Γ, and the inhomogeneous width Δ, the Mössbauer absorption remains low because it is proportional to the factor of Γγ/Γ H. 相似文献
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D.W. Nicoll J. Peternelj D.W. Davidson R.S. Hallsworth M.M. Pintar 《Physics letters. A》1975,55(2):127-129
The proton T1 temperature dependence of CH4 gas in a deuterated clathrate lattice deviates from the semiclassifical predictions. The discrepancy is partially accounted for by including the effects of symmetry and the quantization of rotational states. 相似文献
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Patel RB Bennett AJ Cooper K Atkinson P Nicoll CA Ritchie DA Shields AJ 《Physical review letters》2008,100(20):207405
We report an electrically driven semiconductor single-photon source capable of emitting photons with a coherence time of up to 400 ps under fixed bias. It is shown that increasing the injection current causes the coherence time to reduce, and this effect is well explained by the fast modulation of a fluctuating environment. Hong-Ou-Mandel-type two-photon interference using a Mach-Zehnder interferometer is demonstrated using this source to test the indistinguishability of individual photons by postselecting events where two photons collide at a beam splitter. Finally, we consider how improvements in our detection system can be used to achieve a higher interference visibility. 相似文献