Cyclotron Resonance Spectroscopy Research Articles

Determination of electron effective mass in InN by cyclotron resonance spectroscopy

Abstract We report the determination of electron effective mass in InN by using cyclotron resonance (CR) spectroscopy. To avoid the influence of sapphire substrate on CR measurements, InN epilayer with low residual electron concentration of 5 × 1017 cm−3 was grown on silicon substrate. Together with analyzing the effect of non-parabolic band structure, we derive that the isotropy c-plane electron effective mass of InN epilayer is 0 . 0 50 ± 0.0 0 2 m0 and 0 . 0 58 ± 0.0 0 2 m0 at temperatures of 4.2 and 50 K, respectively, which is in good agreement with our theoretical predication of the effective mass near the Γ point.

Electron effective mass enhancement in Ga(AsBi) alloys probed by cyclotron resonance spectroscopy

The effect of Bi incorporation on the conduction band structure of Ga(AsBi) alloys is revealed by a direct estimation of the electron effective mass via cyclotron resonance absorption spectroscopy at THz frequencies in pulsed magnetic fields up to 65 T. A strong enhancement in the electron effective mass with increasing Bi content is reported, with a value of mass $\ensuremath{\sim}40%$ higher than that in GaAs for $\ensuremath{\sim}1.7%$ of Bi. This experimental evidence unambiguously indicates a Bi-induced perturbation of the host conduction band states and calls for a deep revision of the theoretical models describing dilute bismides currently proposed in the literature, the majority of which neglect or exclude that the incorporation of a small percentage of Bi may affect the conduction band states of the host material.

Long spin relaxation time of holes in InGaAs/GaAs quantum wells probed by cyclotron resonance spectroscopy

In this paper, we report on a long, ms range, hole spin relaxation time in InGaAs/GaAs quantum wells probed by cyclotron resonance spectroscopy in pulsed magnetic fields. In our experiments, we found strong hysteresis in the spectral weights of cyclotron resonance absorption lines when rapidly changing magnetic field is used for the experiment. The hysteresis vanishes when a much slower changing magnetic field is used. We attribute this behavior to a long energy relaxation time between the two lowest spin-split hole Landau levels, i.e., a long hole spin relaxation time. We also present transition frequencies calculated using a $4\ifmmode\times\else\texttimes\fi{}4$ Luttinger Hamiltonian, which confirm our findings.

Cyclotron resonance spectroscopy in a high mobility two dimensional electron gas using characteristic matrix methods

We develop a new characteristic matrix-based method to analyze cyclotron resonance experiments in high mobility two-dimensional electron gas samples where direct interference between primary and satellite reflections has previously limited the frequency resolution. This model is used to simulate experimental data taken using terahertz time-domain spectroscopy that show multiple pulses from the substrate with a separation of 15 ps that directly interfere in the time-domain. We determine a cyclotron dephasing lifetime of 15.1 ± 0.5 ps at 1.5 K and 5.0 ± 0.5 ps at 75 K.

Electrons in potential landscapes of random and correlated distributions of repulsive scatterers

We present simulations of potential landscapes for electrons in random and correlated distributions of repulsive scatterers, which enable the determination of percolation thresholds, densities of states and oscillator strengths. These simulations elucidate experimental results of transport measurements in the quantum Hall regime and cyclotron resonance spectroscopy on intentionally disordered two-dimensional electron systems in GaAs/GaAlAs heterostructures with an additional δ-doping layer of negatively charged beryllium acceptors.

Ground State of a Two-Dimensional Coupled Electron-Hole Gas inInAs/GaSbNarrow Gap Heterostructures

The contributions of wave function hybridization and spontaneous exciton formation to the ground state of closely spaced electron and hole gases in $\mathrm{In}\mathrm{As}/\mathrm{GaSb}$ heterostructures were investigated using cyclotron resonance (CR) spectroscopy. Strongly hybridized samples exhibit two electronlike CR absorptions at all perpendicular magnetic fields. The high frequency mode neither disappears at high temperatures $(\ensuremath{\sim}100\mathrm{K})$ nor is affected by changes in electron or hole density, but is eliminated by a high parallel magnetic field $(\ensuremath{\sim}7\mathrm{T})$. These effects can be understood as signatures of electron-hole wave function hybridization, and cannot be explained in terms of an excitonic gas.

Cyclotron-resonance studies of strongly coupled double quantum wells in tilted magnetic fields near the quantum and semiclassical limits

Far-infrared cyclotron-resonance (CR) spectroscopy has been used to study a pair of strongly coupled two-dimensional electron gases (2DEG's) which were formed in two GaAs quantum wells and separated by a thin ${\mathrm{Al}}_{x}{\mathrm{Ga}}_{1\ensuremath{-}x}\mathrm{As}$ barrier. The degree of wave-function hybridization, along with the effect of a magnetic field parallel to the plane of the electron gas, have been investigated near both the quantum and semiclassical limits, corresponding to low and high filling factors, respectively. Near the quantum regime, the CR transitions in the presence of a small parallel field reveal anticrossing between the Landau levels associated with different hybridized subbands. The energies and intensities of these transitions change with front gate bias, yielding information on the bias dependence of the wave-function hybridization and the subband energy splitting. Close to the semiclassical limit and with strong parallel magnetic fields, two CR peaks are observed. The corresponding cyclotron masses are compared to those expected for noncircular Fermi contours created by anticrossing of the parabolic dispersion curves associated with the coupled 2DEG's. Experimental results in both limits are discussed in the light of predictions from self-consistent solutions of Poisson's and Schroedinger's equations.

Phonon assisted cyclotron resonance in quantum wells

We discuss a new method for studying the electron — confined LO phonon interaction in quantum wells through cyclotron resonance spectroscopy. We have made calculations of the cyclotron resonance in the presence of electron-phonon interactions using the memory function approach. We find that sharp resonances occur at frequencies corresponding to the cyclotron frequency plus the phonon frequencies and that the widths and shifts of these resonances due to electron-phonon scattering are small. The strengths of these resonances then give a measure of the corresponding electron-phonon interaction.

ＦＴ‐ＩＣＲによるＣ３Ｈ６およびＣ２Ｈ４系のイオン‐分子反応の研究

ＦＴ‐ＩＣＲによるＣ３Ｈ６およびＣ２Ｈ４系のイオン‐分子反応の研究

A new detection scheme for Fourier transform-ion cyclotron resonance spectrometry in Penning traps

A new detection scheme for Fourier transform-ion cyclotron resonance (FT-ICR) studies is proposed and initial experimental results are presented. While in conventional FT-ICR, the difference of the transient signals from two opposite electrodes is recorded and Fourier transformed, it is also possible to use the sum of these signals. In this way resonances are observed at the harmonic of the reduced cyclotron frequency 2 ν+ as well as ν+−ν− and ν++ν−, the later being important for accurate mass measurements. The experiments were performed with a Penning trap in an electromagnet.

Formation, reactivity, and relative stability of clustered alkoxide ions by cyclotron resonance spectroscopy

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTFormation, reactivity, and relative stability of clustered alkoxide ions by cyclotron resonance spectroscopyLarry K. Blair, Paulo C. Isolani, and Jose M. RiverosCite this: J. Am. Chem. Soc. 1973, 95, 4, 1057–1060Publication Date (Print):February 1, 1973Publication History Published online1 May 2002Published inissue 1 February 1973https://doi.org/10.1021/ja00785a011RIGHTS & PERMISSIONSArticle Views176Altmetric-Citations51LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (484 KB) Get e-Alerts Get e-Alerts