Theory of degenerate<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mn>1</mml:mn><mml:mi>s</mml:mi></mml:math>excitons in zinc-blende-type crystals in a magnetic field: Exchange interaction and cubic anisotropy

Cho, K.; Suga, S.; Dreybrodt, Wolfgang; Willmann, F.

doi:10.1103/physrevb.11.1512

Cited by 160 publications

(33 citation statements)

References 9 publications

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“…This value can be compared with the exciton g-factor in bulk CdTe estimated taking into account the complex valence band effects. 21,30,31 Calculation gives |g exc | ≈ 0.1 if the electron-hole exchange interaction is disregarded 31 or |g exc | ≈ 0.35 with allowance for electron-hole exchange. In these estimations we used an electron g-factor g e = −1.64 and included the renormalization of the magnetic Luttinger parameter κ from 0.35 to 0.25 owing to magnetic field induced mixing of exciton states.…”

Section: Circular Versus Linear Birefringencementioning

confidence: 99%

Magnetic field induced nutation of exciton-polariton polarization in (Cd,Zn)Te crystals

et al. 2013

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We study the polarization dynamics of exciton-polaritons propagating in sub-mm thick (Cd,Zn)Te bulk crystals using polarimetric time-of-flight techniques. The application of a magnetic field in Faraday geometry leads to synchronous temporal oscillations of all Stokes parameters of an initially linearly or circularly polarized, spectrally broad optical pulse of 150 fs duration propagating through the crystal. Strong dispersion for photon energies close to the exciton resonance leads to stretching of the optical pulse to a duration of 200−300 ps and enhancement of magneto-optical effects such as the Faraday rotation and the non-reciprocal birefringence. The oscillation frequency of the excitonpolariton polarization increases with magnetic field B, reaching 10 GHz at B ∼ 5 T. Surprisingly, the relative contributions of Faraday rotation and non-reciprocal birefringence undergo strong changes with photon energy, which is attributed to a non-trivial spectral dependence of Faraday rotation in the vicinity of the exciton resonance. This leads to polarization nutation of the transmitted optical pulse in the time domain. The results are well explained by a model that accounts for Faraday rotation and magneto-spatial dispersion in zinc-blende crystals. We evaluate the exciton g-factor |gexc| = 0.2 and the magneto-spatial constant V = 5 × 10 −12 eVcmT −1 .

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Section: Circular Versus Linear Birefringencementioning

confidence: 99%

Magnetic field induced nutation of exciton-polariton polarization in (Cd,Zn)Te crystals

et al. 2013

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“…The twelve exciton states are built from the electron and the hole states, and the many-body treatment of the problem leads to an effective Hamiltonian for the electron-hole spin-exchange interaction. In the most general way this writes [36] : . (5) The first term is the spherical short-range exchange interaction [37].…”

Section: Iii2a) Spectral Properties Of Neutral Excitonsmentioning

confidence: 99%

Polarized emission from GaN/AlN quantum dots: Single-dot spectroscopy and symmetry-based theory

et al. 2008

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We report micro-photoluminescence studies of single GaN/AlN quantum dots grown along the (0001) crystal axis by molecular beam epitaxy on Si(111) substrates. The emission lines exhibit a linear polarization along the growth plane, but with varying magnitudes of the polarization degree and with principal polarization axes that do not necessarily correspond to crystallographic directions. Moreover, we could not observe any splitting of polarized emission lines, at least within the spectral resolution of our setup (1 meV). We propose a model based on the joint effects of electron-hole exchange interaction and in-plane anisotropy of strain and/or quantum dot shape, in order to explain the quantitative differences between our observations and those previously reported on, e.g. CdTe-or InAs-based quantum dots.

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“…The analysis of excitonic absorption spectra in both electric and magnetic field strengths has been a long-standing subject from the theoretical as well as experimental point of view [15][16][17][18]. Due to specific material parameters, excitonic properties such as Bohr radius and electric/magnetic field strength units provide the possibility to access exotic regimes more easily compared to standard atomic systems.…”

Section: Introductionmentioning

confidence: 99%

Excitonic giant-dipole potentials in cuprous oxide

2017

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In this work we predict the existence of a novel species of Wannier excitons when exposed to crossed electric and magnetic fields. In particular, we present a theory of giant-dipole excitons in Cu2O in crossed fields. Within our theoretical approach we perform a pseudoseparation of the centerof-mass motion for the field-dressed excitonic species, thereby obtaining an effective single-particle Hamiltonian for the relative motion. For arbitrary gauge fields we exactly separate the gaugedependent kinetic energy terms from the effective single-particle interaction potential. Depending on the applied field strengths and the specific field orientation, the potential for the relative motion of electron and hole exhibits an outer well at spatial separations up to several micrometers and depths up to 380 µeV, leading to possible permanent excitonic electric dipole moments of around three million Debye.

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Theory of degenerate1sexcitons in zinc-blende-type crystals in a magnetic field: Exchange interaction and cubic anisotropy

Cited by 160 publications

References 9 publications

Magnetic field induced nutation of exciton-polariton polarization in (Cd,Zn)Te crystals

Magnetic field induced nutation of exciton-polariton polarization in (Cd,Zn)Te crystals

Polarized emission from GaN/AlN quantum dots: Single-dot spectroscopy and symmetry-based theory

Excitonic giant-dipole potentials in cuprous oxide

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