Resonant-Polaron-Coupling Investigation by a Study of Linewidths, Strengths, and Frequencies of Cyclotron Resonance and Magnetic-Impurity Absorption in InSb

Summers, C. J.; Dennis, R.B.; Wherrett, B. S.; Harper, P.G.; Smith, S. D.

doi:10.1103/physrev.170.755

Cited by 75 publications

(4 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For example, recent interband measurements on grey tin 30 show similar discrepancies with earlier intraband measurements 31 for the conduction-and valence-band masses. In addition the conduction-band g value of InSb as determined by electron spin resonance (Bemski, 32 Isaacson 33 ) does not agree with that determined by interband magnetoabsorption (Pidgeon et al u ); further, both determinations are inconsistent with the cyclotron-resonance effective mass 28,29 if one uses the simple formula given by Roth et alP for the band-edge g value.…”

Section: Acknowledgmentsmentioning

confidence: 98%

Inversion-Asymmetry and Warping-Induced Interband Magneto-Optical Transitions in InSb

1969

View full text Add to dashboard Cite

Direct interband magneto-optical transitions have been observed at k = 0 in InSb using the reflection technique at 1.5°K. In addition to the normal spectral structure associated with allowed transitions, some strong features have been observed associated with "extra" transitions produced both by the warping and the linear-in-k splitting of the valence band of InSb. An unambiguous assignment of the origin of these transitions has been made by a study of the anisotropy of the spectra [with the magnetic field H in the (110) crystal plane^ using left and right circularly polarized light. With the allowed and extra transitions, we can determine the relative energies of the first five valence-band magnetic energy levels. By fitting these, and the strengths of the extra transitions, we determine Luttinger's warping parameter (73-72) and the Dresselhaus inversion-asymmetry parameter C. In addition, it is necessary to retain Luttinger's parameter q, which normally has been assumed to be zero. This quantity is present in the effective-mass Hamiltonian when there is a magnetic field and spin-orbit interaction. We find: (73 -Y2) = 1.2±15%, q~0Adz50%, and C=6.6X10~4 a.u. ±30%. This value of C is about 4.5 times smaller than an erroneous value published previously.

show abstract

Section: Acknowledgmentsmentioning

confidence: 98%

Inversion-Asymmetry and Warping-Induced Interband Magneto-Optical Transitions in InSb

1969

View full text Add to dashboard Cite

show abstract

“…In this case, the light frequency ! can substantially differ from the frequency of transverse optical phonons where the lattice reflection is important [29,30]. This, in turn, will facilitate the experimental observation of the bound states in graphene.…”

mentioning

confidence: 95%

“…1(left)) and this creates an additional possibility that the splitting of the absorption peak can also be observed in combined resonance absorption with a participation of the zero Landau level. In this case the light frequency ø can substantially differ from the frequency of transverse optical phonons, near which the lattice reflection is important [29,30]. This in its turn facilitates the experimental observation of the bound states in graphene.…”

mentioning

confidence: 99%

Electron-Phonon Bound States in Graphene in a Perpendicular Magnetic Field

2012

View full text Add to dashboard Cite

The spectrum of electron-phonon complexes in monolayer graphene is investigated in the presence of a perpendicular quantizing magnetic field. Despite the small electron-phonon coupling, usual perturbation theory is inapplicable for the calculation of the scattering amplitude near the threshold of optical phonon emission. Our findings, beyond perturbation theory, show that the true spectrum near the phonon-emission threshold is completely governed by new branches, corresponding to bound states of an electron and an optical phonon with a binding energy of the order of αω(0), where α is the electron-phonon coupling and ω(0) the phonon energy.

show abstract

“…Thus the cyclotron resonance of electrons and holes should exhibit a modi-fication of the Landau levels due to polaron coupling whenever the cyclotron frequency ប c becomes comparable to the longitudinal-optic-phonon frequency ប LO . [10][11][12][13] For ␣ϭ0.2, the weak-coupling limit is still applicable. 10 Polaron coupling phenomena have been observed in the past in PbTe, but a quantitative description of the carrier-LO-phonon interaction in this many valley semiconductor is still not yet available.…”

Section: Introductionmentioning

confidence: 99%

Magnetoreflectivity ofPb1−xEu
Yuan
¹
,
Krenn
²
,
Springholz
³

et al. 1997
Phys. Rev. B
44
0
17
0
View full text Add to dashboard Cite

Molecular-beam epitaxy grown n-type Pb 1Ϫx Eu x Te epilayers (xр0. 034) and PbTe/ Pb 1Ϫx Eu x Te (xр0.039) multiple-quantum-well ͑MQW͒ samples were studied by magnetoreflectivity in the Faraday configuration (Bʈ͓111͔) for magnetic fields up to 6 T at 4.2 K. Since the IV-VI lead salt compounds are quite polar semiconductors, resonant electron-longitudinal-optic-͑LO-͒ phonon coupling ͑Fröhlich cou-pling͒ modifies the cyclotron resonance ͑CR͒ energies in the Pb 1Ϫx Eu x Te single epilayers for the threedimensional ͑3D͒ case. Due to the many-valley band structure two different Fröhlich coupling constants are relevant. However, the CR energies of quasi-two-dimensional ͑2D͒ carriers in PbTe wells ͓n 2D ϭ(1.5Ϫ3)ϫ10 11 cm Ϫ2 ͔ of PbTe/Pb 1Ϫx Eu x Te MQW samples do not exhibit a significant resonant electron-LO-phonon interaction. This observation is attributed to finite-electron concentration effects, in particular, to a partial filling of the lowest 2D Landau spin level. The static and dynamic screening of the polar interaction are considered as well, but are ruled out as an explanation for the absence of any remarkable polaron correction to the CR energies of electrons in the PbTe quantum wells for the range of carrier concentrations investigated. The magnetoreflectivity spectra of Pb 1Ϫx Eu x Te single layers and PbTe/Pb 1Ϫx Eu x Te quantum well samples are simulated numerically, using a model for the dielectric response of IV-VI compounds in a magnetic field, which also includes the electron-LO-phonon interaction. The transverse and longitudinal masses, and thus also the interband momentum matrix elements are determined for Pb 1Ϫx Eu x Te as a function of the composition up to xϽ0.034. It is found that the transverse mass increases with Eu content, whereas the longitudinal one nearly stays constant. The 2D CR masses of electrons in the PbTe wells increase with decreasing well width, i.e., with increasing quantum-well interband energies, a behavior which results from the strong band nonparabolicity.

show abstract

Resonant-Polaron-Coupling Investigation by a Study of Linewidths, Strengths, and Frequencies of Cyclotron Resonance and Magnetic-Impurity Absorption in InSb

Cited by 75 publications

References 20 publications

Inversion-Asymmetry and Warping-Induced Interband Magneto-Optical Transitions in InSb

Inversion-Asymmetry and Warping-Induced Interband Magneto-Optical Transitions in InSb

Electron-Phonon Bound States in Graphene in a Perpendicular Magnetic Field

Magnetoreflectivity ofPb1−xEu
Yuan
¹
,
Krenn
²
,
Springholz
³

et al. 1997
Phys. Rev. B
44
0
17
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Resonant-Polaron-Coupling Investigation by a Study of Linewidths, Strengths, and Frequencies of Cyclotron Resonance and Magnetic-Impurity Absorption in InSb

Cited by 75 publications

References 20 publications

Inversion-Asymmetry and Warping-Induced Interband Magneto-Optical Transitions in InSb

Inversion-Asymmetry and Warping-Induced Interband Magneto-Optical Transitions in InSb

Electron-Phonon Bound States in Graphene in a Perpendicular Magnetic Field

Magnetoreflectivity ofPb1−xEuYuan1, Krenn2, Springholz3 et al. 1997Phys. Rev. B440170View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Magnetoreflectivity ofPb1−xEu
Yuan
¹
,
Krenn
²
,
Springholz
³

et al. 1997
Phys. Rev. B
44
0
17
0
View full text Add to dashboard Cite