An observation of quantum interference effect in photocurrent spectra of a weakly coupled bound-to-continuum multiple quantum well photodetector is reported. This effect persists even at high biases where the Kronig–Penney minibands of periodic superlattice potential in the continuum are destroyed. Our results show that electrons remain coherent over a distance of 40–50 nm. The observation was ...

The carrier dynamics in PF6 doped polypyrrole has been probed by dielectric spectroscopy (from 10(-4) to 4 eV), down to 4.2 K. The phase-sensitive sub-THz data have assisted to resolve the discrepancies in Kramers-Kronig analysis in earlier studies. Even in metallic samples, just 1% of the carriers are delocalized, at 300 K; the fraction drops down considerably as a function of disorder, carrie...

We present measurement and analysis techniques that allow the complex magneto-conductivity tensor to be determined from measurements of the complex Faraday (θF) and Kerr (θK) angles. θF and θK are measured in a Ga1−xMnxAs and SrRuO3 films. Thick film transmission and reflection equations are used to convert the complex θF and θK into the complex longitudinal conductivity σxx and the complex tra...

The optical reflectivity of a vacancy doped colossal magnetoresistance material La0.936Mn0.982O3 has been investigated on single-crystal samples as a function of temperature and at zero and 0.5 T magnetic fields. The conductivity has been evaluated by Kramers-Kronig analysis in the frequency range of 100–20 000 cm. The broad peak in the optical conductivity, observed at room temperature around ...

This paper examines the highand low-frequency asymptotic consequences of the Kramers-Kronig relations which hold for the real and imaginary parts of the Fourier transform of the response of any linear causal system. By knowing or assuming the highor low-frequency expansion of one of these functions, the corresponding asymptotic expansion of the other is easily determined, and furthermore the co...

The effect (Stark effect) of an applied electric field on the electronic states of molecular adsorbates was studied by measuring surface plasmon resonance (SPR) as a function of the wavelength of the incident light that excites the SPR. Using the Kramers-Kronig relation, Stark spectra comparable to those obtained with conventional methods were extracted from the electric field-induced SPR angul...

2014 Normal and oblique incidence reflectances of GaTe have been measured in the 2.5 to 26 eV range using polarized synchrotron radiation. We have deduced 3 complex refractive indices, relative to 3 different crystallographic directions by means of a new method consistent with the Kramers-Kronig relations. We have verified that the electronic transitions in the 20 eV region, from the 3d Ga leve...

Mesoporous layers of silica are of interest for many optical applications, including the creation of devices ranging from optical sensors to laser sources with promising characteristics. Their optical characterization goes through the interpretation of measurements. We propose to give experimental results of reflectance and scattering measurements concerning mesoporous layers of silica deposite...

very important point of view of the woman herself, and it consequently cannot be ignored. The book is a glorification of the Franen Klinik at Freiburgh run by Drs. Kronig and Gauss, and gives the detailed experiences of many women who have gone through the Klinik. It is written in a somewhat sensational style, but the fact remains that there exists in the United States a propaganda among women ...

We present the first quantum system where Anderson localization is completely described within periodic-orbit theory. The model is a quantum graph analogous to an aperiodic Kronig-Penney model in one dimension. The exact expression for the probability to return to an initially localized state is computed in terms of classical trajectories. It saturates to a finite value due to localization, whi...