Manifestation of exitonic effects in the magneto-oscillations of the intensity of the recombination radiation of 2D electrons

Volkov, O. V.; Zhitomirskii, V. E.; Кукушкин, И. В.; Klitzing, K. von; Eberl, K.

doi:10.1134/1.567296

Cited by 6 publications

(5 citation statements)

References 2 publications

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“…We believe that the LCS is a (dense) gas of indirect excitons. This interpretation is supported by the observation of a phase-shift in the MO, since a similar behavior has been recently observed in the optical properties of 2D excitons [12] and directly witnesses a change in the DOS, as conÿrmed by the general behavior of the MO [8]. In the same picture, we explain the LCS low current as a consequence of the reduced tunneling probability of indirect excitons with respect to free-carriers.…”

supporting

confidence: 87%

Dissociation of indirect excitons: discontinuity and bistability in the tunnel current of 2D electron-hole layers

Parlangeli

Christianen

Maan

et al. 2000

Physica E: Low-dimensional Systems and Nanostructures

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supporting

confidence: 87%

Dissociation of indirect excitons: discontinuity and bistability in the tunnel current of 2D electron-hole layers

Parlangeli

Christianen

Maan

et al. 2000

Physica E: Low-dimensional Systems and Nanostructures

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“…This assignment is supported by the phase shift of the MO, since a similar behavior has been observed by Volkov et al 16 in the optical spectra of direct excitons and explained by the presence of exciton states below the free-particle LL's. 17 We stress that our experimental results are remarkably consistent with a Fermi-Dirac distribution of the indirect excitons, in agreement also with Ref.…”

supporting

confidence: 68%

Dissociation of indirect excitons: Discontinuity and bistability in the tunnel current of single-barrier heterostructures

et al. 1999

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We observed a new discontinuity and bistability in the tunnel current of a 12-nm single-barrier GaAs/AlAs p-i-n heterostructure where a system of spatially separated two-dimensional electron and hole (e-h) layers of equal and tunable density is realized. Both features appear at TՇ300 mK and are substantially enhanced in a magnetic field Bտ10 T perpendicular to the layers. They correspond to a discontinuity in the e-h density and in the phase of the current magneto-oscillations, which we suggest to arise from a transition between indirect excitons and the uncoupled e-h gases. ͓S0163-1829͑99͒12343-9͔

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“…33 Our experimental results are consistent with Ref. 32 and are based on the assumption that the electrons, although forming excitons, obey a Fermi statistics. This surprising behavior, which is a direct consequence of the interpretation of the current magneto-oscillations in terms of the carrier density, is also in agreement with optical studies of the IE linewidth at low density.…”

Section: Current Magneto-oscillationssupporting

confidence: 88%

Bistability and discontinuity in the tunnel current of two-dimensional electron-hole layers

et al. 2001

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We present a detailed study of a recently reported discontinuity and bistability in a 12-nm GaAs/AlAs single-barrier p-i-n heterostructure, where a system of spatially separated two-dimensional electron and hole (e-h) layers of equal and tunable density is realized. Both features appear at TՇ300 mK and are strongly enhanced in a magnetic field Bտ10 T perpendicular to the layers, whereas they are suppressed by Bϳ1 T parallel to the layers. They correspond to a discontinuity in the e-h density and in the phase of the current magneto-oscillations. Whereas the high-current state has the expected properties of the uncoupled e-h layers, the low-current state behaves anomalously under all circumstances, and we identify them with a gas of spatially indirect excitons with binding energy 0.03 meVՇE b Շ0.3 meV and 0.5 meVՇE b Շ5 meV at B ϭ0 and Bϭ10 T, respectively. We interpret the bistability as a transition between the two regimes, which arises because of the competition between the in-plane screening, determined by the average e-e (h-h) distance and the magnetic length, and the interlayer e-h attraction.

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Manifestation of exitonic effects in the magneto-oscillations of the intensity of the recombination radiation of 2D electrons

Cited by 6 publications

References 2 publications

Dissociation of indirect excitons: discontinuity and bistability in the tunnel current of 2D electron-hole layers

Dissociation of indirect excitons: discontinuity and bistability in the tunnel current of 2D electron-hole layers

Dissociation of indirect excitons: Discontinuity and bistability in the tunnel current of single-barrier heterostructures

Bistability and discontinuity in the tunnel current of two-dimensional electron-hole layers

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