Filling factor dependent Landau level broadening studied with inter- and intraband magneto-optics in GaInAs/AlInAs MDQWs

Potemski, M.; Zhang, Y.H.; Hausenblas, M.; Maan, J.C.; Martinez, G.

doi:10.1016/0039-6028(92)90415-3

Cited by 9 publications

(3 citation statements)

References 8 publications

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“…The broadening at fields B m thus reflects two CR modes, namely the transitions L −m → L −m+1 and L −m−1 → L −m , with nearly equal intensities. It is worth noting that the CR width oscillating with the filling factor might also be reminiscent of another phenomenon-the difference in screening properties of a full or half-filled last-occupied LL in a two-dimensional (2D) parabolic-band electron gas [36][37][38][39]. Apart from the discussed weak oscillations in ν, the CR width does not exhibit any clear field dependence, which would facilitate the identification of the main source of scattering in the sample, based on predictions of available theories, see, e.g., [40][41][42].…”

Section: Resultsmentioning

confidence: 99%

Classical to quantum crossover of the cyclotron resonance in graphene: a study of the strength of intraband absorption

et al. 2012

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We report on absolute magneto-transmission experiments on highly doped quasi-free-standing epitaxial graphene targeting the classical-to-quantum crossover of the cyclotron resonance. This study allows us to directly extract the carrier density and also other relevant quantities such as the quasiparticle velocity and the Drude weight, which is precisely measured from the strength of the cyclotron resonance. We find that the Drude weight is renormalized with respect to its non-interacting (or random phase approximation) value and that the renormalization is tied to the quasiparticle velocity enhancement. This finding is in agreement with recent theoretical predictions, which attribute the 6

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Section: Resultsmentioning

confidence: 99%

Classical to quantum crossover of the cyclotron resonance in graphene: a study of the strength of intraband absorption

et al. 2012

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“…Note that from (16) we can obtain the monotonicity of E,(X).') Generally, in a one-dimensional quantum me- In contrast to Fig.…”

Section: Why Are There Infinitely Flat Plateaus For the Step Potential?mentioning

confidence: 98%

“…The cyclotron relaxation measurements, in which transitions between filled and empty Landau branches are observed, can be expected to be governed by the direct optical transitions (conserving the wave vector ky N X ) . On the other hand, the interband photoluminescence, measwing transitions from the occupied Landau levels to the valence or the impurity levels, exhibits k-relaxations [16] and only the total DOS of the occupied and unoccupied branches is of importance.…”

Section: Magnetooptical Spectroscopymentioning

confidence: 99%

Electron structure near abrupt edges in 2DEG under strong magnetic field

Bartoš

Rosenstein

1996

Physica Status Solidi (b)

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Energies and wave functions of edge states in a two-dimensional eledron gas are evaluated for a finite step potential barrier model. The spectrum, instead of smooth bending of Landau branches in the vicinity of the barrier acquires a step-like form; unexpected edge plateaus and significant energy gap reduction take place between the neighbouring Landau branches above the barrier tops. The origin of these phenomena is traced. Stability with respect to modifications is established. Manifestation of the qualitatively new features of electron densities of states in abrupt confinements through magnetooptical and nuclear magnetic spin relaxation effects is proposed.

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Filling‐Factor‐Dependent Cyclotron Resonance in GaInAs/AlInAs Modulation‐Doped Single Quantum Wells

Jianc

Goiran

Leotin

et al. 1993

Physica Status Solidi (b)

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The line shape of cyclotron resonance (CR) absorption is investigated for a two-dimensional electron gas (2DEG) in modulation-doped GaInAs/AlInAs narrow SQW structures. CR absorption is measured as functions of far infrared (FIR) frequency, temperature, and carrier concentration. At low temperature and short FIR wavelengths, a well-defined filling-factor-dependent quantum oscillation structure is obtained for samples with high 2DEG concentrations, exhibiting clear maxima and minima and a phase change point at the top of the CR peak. The modulated scattering is attributed to short-range scatterers originating mainly from alloy scattering. A part of the contribution comes from ionized impurity scattering. The analysis of the temperature dependence of the CR line width and Hall mobility gives additional support to this argument. An electron effective mass as high as 0.063m0 in Ino.53 Gao,,,As is observed due to the non-parabolicity effect.La resonance cyclotron (R.C.) d u n gaz bidimensionel d'electrons (2DEG), confines dans des puits quantiques ttroits obtenus dans des structures GaInAs/AlInAs a modulation de dopage, est etudite. La R.C. est mesuree en fonction de la frequence dexcitation dans l'1.R. lointain, de la temperature et de la densite de porteurs. Pour les plus courtes longueurs d'onde des oscillations quantiques de I'intensite d'absorption sont clairement mises en evidence a basse temperature. L'ttude de la forme de la R.C. pour une gamme ktendue de temperatures et d'energies d'excitation ainsi que la comparaison avec les resultats de mesures de Hall permettent d'analyser la diffusion des porteurs dans ce systeme. Cette diffusion est attribuee pour la plus grande part a une distribution de potentiels diffuseurs, a courte portke provenant du desordre d'alliage. Enfin, la valeur elevke de la masse effective m* = 0.063~1, mesuree dans l'echantillon ayant la plus forte concentration de porteurs est attribute a un fort effet de nonparabolicitt.

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Filling factor dependent Landau level broadening studied with inter- and intraband magneto-optics in GaInAs/AlInAs MDQWs

Cited by 9 publications

References 8 publications

Classical to quantum crossover of the cyclotron resonance in graphene: a study of the strength of intraband absorption

Classical to quantum crossover of the cyclotron resonance in graphene: a study of the strength of intraband absorption

Electron structure near abrupt edges in 2DEG under strong magnetic field

Filling‐Factor‐Dependent Cyclotron Resonance in GaInAs/AlInAs Modulation‐Doped Single Quantum Wells

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