scholarly journals Does Fourier analysis yield reliable amplitudes of quantum oscillations?

2018 ◽  
Vol 83 (3) ◽  
pp. 30201 ◽  
Author(s):  
Alain Audouard ◽  
Jean-Yves Fortin
Keyword(s):  
Fourier Analysis ◽  
Organic Conductors ◽  
Reliable Data ◽  
Fourier Component ◽  
Quantum Oscillation ◽  
Field Range ◽  
Quantum Oscillations ◽  
Effective Masses ◽  
Window Width

Quantum oscillation amplitudes of multiband metals, such as high-Tc superconductors in the normal state, heavy fermions or organic conductors, are generally determined through Fourier analysis of the data even though the oscillatory part of the signal is field dependent. It is demonstrated that the amplitude of a given Fourier component can strongly depend on both the nature of the windowing (either flat, Hahn or Blackman window) and, since oscillations are obtained within a finite field range, the window width. Consequences on the determination of the Fourier amplitudes, hence of the effective masses, are examined in order to determine the conditions for reliable data analysis.

Unexpected additional damping of magnetic quantum oscillations in layered organic conductors in tilted magnetic fields

2001 ◽  
Vol 294-295 ◽  
pp. 439-441 ◽  
Author(s):  
J.A. Symington ◽  
J. Singleton ◽  
N. Clayton ◽  
J. Schlueter ◽  
M. Kurmoo ◽  
...  
Keyword(s):  
Magnetic Fields ◽  
Organic Conductors ◽  
Quantum Oscillations ◽  
Magnetic Quantum Oscillations

Fourier analysis determination of best focus in submicron lithography

1994 ◽  
Author(s):  
S. Jeffrey Rosner ◽  
Nader Shamma ◽  
Frederik Sporon-Fiedler
Keyword(s):  
Fourier Analysis ◽  
Analysis Determination

Determination of Cyclotron Effective Masses on LaSb

2002 ◽  
Vol 71 (7) ◽  
pp. 1752-1756 ◽  
Author(s):  
Makoto Yoshida ◽  
Keiichi Koyama ◽  
Takahiro Tomimatsu ◽  
Makoto Shirakawa ◽  
Akira Ochiai ◽  
...  
Keyword(s):  
Effective Masses

Quantum oscillations in the high- T c cuprates

2011 ◽  
Vol 369 (1941) ◽  
pp. 1687-1711 ◽  
Author(s):  
Suchitra E. Sebastian ◽  
Neil Harrison ◽  
Gilbert G. Lonzarich
Keyword(s):  
Fermi Surface ◽  
Cuprate Superconductors ◽  
Low Energy ◽  
Quantum Oscillation ◽  
Electronic Excitations ◽  
Close Correspondence ◽  
Metal Insulator Transition ◽  
Metal Insulator ◽  
Quantum Oscillations ◽  
Underdoped Cuprates

We review recent progress in the study of quantum oscillations as a tool for uniquely probing low-energy electronic excitations in high- T c cuprate superconductors. Quantum oscillations in the underdoped cuprates reveal that a close correspondence with Landau Fermi-liquid behaviour persists in the accessed regions of the phase diagram, where small pockets are observed. Quantum oscillation results are viewed in the context of momentum-resolved probes such as photoemission, and evidence examined from complementary experiments for potential explanations for the transformation from a large Fermi surface into small sections. Indications from quantum oscillation measurements of a low-energy Fermi surface instability at low dopings under the superconducting dome at the metal–insulator transition are reviewed, and potential implications for enhanced superconducting temperatures are discussed.

scholarly journals Lidar Overlap Function Determination Using the Raman Lidar Signals

2020 ◽  
Vol 237 ◽  
pp. 07018
Author(s):  
Jaswant ◽  
Shishir Kumar Singh ◽  
Radhakrishnan S.R. ◽  
Devesh Shukla ◽  
Chhemendra Sharma
Keyword(s):  
Optical Properties ◽  
Simple Technique ◽  
Near Field ◽  
Lower Atmosphere ◽  
Raman Lidar ◽  
Lidar System ◽  
Field Range ◽  
The Mean ◽  
Overlap Factor

The determination of vertical distribution of optical properties of clouds and aerosols using the lidar system is affected by the incomplete overlap between the field of view of transmitter i.e. laser beam & the receiver in the near‐field range. Thus, the study of vertical profiles of aerosol optical properties in the lower atmosphere is erroneous without the correction of lidar overlap function. Here we have analysed the effect of overlap using a simple technique proposed by Ansmann and Wandinger to determine overlap function. We have determined the overlap factor for 5 different days of June 2016 and then calculated the mean overlap profile and determined the relative deviation of each day with respect to mean overlap factor. Results reveal that the complete overlap was achieved beyond 300 meters.

Microroughness at the Si/SiO2 Interface from Pre-Oxidation Annealing, Measured Using Quantum Oscillations in Fowler-Nordheim Tunneling Currents

1992 ◽  
Vol 280 ◽  
Author(s):  
J. C. Poler ◽  
K. K. McKay ◽  
E. A. Irene
Keyword(s):  
Gate Dielectrics ◽  
Interface Roughness ◽  
Quantum Oscillation ◽  
Interfacial Region ◽  
Mos Capacitors ◽  
Quantum Oscillations ◽  
High Temperature Anneal ◽  
Afm Imaging ◽  
Tunneling Currents ◽  
Nordheim Tunneling

ABSTRACTAs design rules shrink to conform with ULSI device dimensions, gate dielectrics for MOSFET structures are required to be scaled to even thinner proportions. Upon scaling the gate oxides below ∼60Å some properties of the device, such as interface roughness, that are negligible for thicker films become critical and must be evaluated. Microroughness at the interface of ultrathin MOS capacitors has been shown to degrade these devices.We are studying the interfacial region of ∼50Å SiO2 on Si using the quantum oscillations in Fowler-Nordheim tunneling currents. The oscillations are sensitive to the electron potential and abruptness of the film and its interfaces. In particular, inelastic scattering and/or thickness inhomogeneities in the film will reduce the amplitude of the oscillations. We are using the amplitude of the oscillations to examine the degree of microroughness at the interface that results from a pre-oxidation high temperature anneal in an inert ambient containing various amounts of H2O. Preliminary AFM imaging has shown correlations supporting our microroughness interpretation of the quantum oscillation amplitudes.

scholarly journals Fourier Analysis of AC Polarography. Elimination of Non-Faradaic Effects and Determination of Kinetic Parameters for Cd(II)-Na2SO4System

1974 ◽  
Vol 47 (10) ◽  
pp. 2486-2489 ◽  
Author(s):  
Michio Hirota ◽  
Yoshio Umezawa ◽  
Hiroyuki Kojima ◽  
Shizuo Fujiwara
Keyword(s):  
Fourier Analysis ◽  
Kinetic Parameters
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