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Makino, T.; Furuta, Yutaka; Segawa, Y.; Tsukazaki, Atsushi; Ohtomo, Akira; Hirayama, Y.; Shen, R.; Takeyama, S.; Takagi, Yoshihiro; Kawasaki, Masashi

doi:10.1103/physrevb.80.155333

Cited by 11 publications

(5 citation statements)

References 30 publications

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“…At 0 T, the X¯ PL band is located about 6 meV below the free-exciton emission (X 0 ) observed at 3.375 eV. This Stokes shift is similar to the binding energy of charged exciton in modulation-doped ZnO QWs [25]. When we focus ourselves on the magnetic field dependence of the peak energy in the range of B < 20 T, both the samples A and B exhibit the redshift with an increase in the magnetic field as shown in Figs. 3(e) and 3(f) (open squares).…”

Section: Methodssupporting

confidence: 53%

“…If the Zeeman effects on the energies of the quantized electronic states and the valence band are extraordinarily strong so as to cancel the blueshifting behavior associated with the B-induced formation of the Laudau levels, one may be able to explain this redshift. Such an extraordinary large g value has not been reported in ZnO SHJ containing the high-density 2DEG (n e > 10 12 cm -2 ) [9,10,25]. This observation is decisive to the assignment to the charged exciton despite the high electron concentration in our SHJs.…”

Section: Methodsmentioning

confidence: 44%

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Magneto-photoluminescence of charged excitons from MgxZn1−xO/ZnO heterojunctions

et al. 2013

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We report on the photoluminescence (PL) properties of MgZnO/ZnO heterojunctions grown by plasma-assisted molecular-beam epitaxy. Influence of the applied magnetic field (B) on the radiative recombination of the two-dimensional electron gas (2DEG) is investigated up to 54 T. An increase in magnetic field in the range of B ≤ 20 T results in a redshift in the PL. Abrupt lineshape changes in the PL spectra are observed at higher magnetic fields, in correlation with the integer quantum Hall states. We attempt to interpret these features using the conventional model for the 2DEG-related PL based on the transition between the 2DEG and a hole as well as a model taking a bound state effect into account, i.e., a charged exciton. The comparison about the adequateness of these models was made, being in favor of the charged exciton model.

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Section: Methodssupporting

confidence: 53%

Section: Methodsmentioning

confidence: 44%

Magneto-photoluminescence of charged excitons from MgxZn1−xO/ZnO heterojunctions

et al. 2013

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“…[15][16][17][18] As another interesting aspect of ZnO research, the electrical and optical properties under a two-dimensional system have been investigated with Zn 1Àx Mg x O/ZnO quantum wells and heterostructures. 19,20 Nonmagnetic Zn 1Àx Mg x O as widegap semiconductors plays an important role in working as quantum barriers for ZnO. Similarity, magnetic Zn 1Àx Co x O is expected to behave as wide-gap semiconductors 21 and is of particular interest in studies concerning quantum phenomena with coupling between spins and carriers.…”

Section: Introductionmentioning

confidence: 99%

Lattice, band, and spin engineering in Zn1−xCoxO

Matsui

Tabata

2013

Journal of Applied Physics

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This work was conducted to investigate lattice, band, and spin engineering of magnetic Zn 1Àx Co x O layers towards quantum barriers in ZnO. Lattice distortions by doping with Co ions caused a flat tetrahedron in the host, leading to an increase of spontaneous polarization in Zn 1Àx Co x O compared to ZnO based on the point-charge model. The band-gap energy increased linearly with the Co concentrations, which was very similar to the band-gap widening in Zn 1Àx Mg x O derived from sp hybridization. The Co (3d) states were located in the mid-gap, which remained unchanged following changes in Co concentrations. Large magneto-optical effects were induced at the band edge due to sp-d exchange interactions. However, magneto-optical activity was reduced in heavily doping concentrations above x ¼ 0.16 because of antiferromagnetic coupling between nearest-neighbor Co ions. The high magnetic activity at x ¼ 0.10 is related to competition between the complex Co-related configurations, such as singles, pairs, open and closed triples, in Co-doped ZnO layers. Magnetic Zn 1Àx Co x O therefore has an effective layer composition for applications of quantum barriers. V C 2013 AIP Publishing LLC. [http://dx.

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“…The optical properties of the QWs include also different exciton complexes, in particular, negatively charged excitons (trions, T) formed from resident electrons provided by doping. Trions were observed in ZnO/(Zn,Mg)O QWs and studied by different magnetooptical methods 10,11 . To explore the coherent properties of excitons and exciton complexes, the methods of four-wave-mixing and photon echoes are very efficient 12 .…”

Section: Introductionmentioning

confidence: 99%

Coherent dynamics of localized excitons and trions in ZnO/(Zn,Mg)O quantum wells studied by photon echoes

Solovev,

Poltavtsev,

Kapitonov

et al. 2018

Preprint

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We study optically the coherent evolution of trions and excitons in a δ-doped 3.5 nm-thick ZnO/Zn0.91Mg0.09O multiple quantum well by means of time-resolved four-wave mixing at temperature of 1.5 K. Employing spectrally narrow picosecond laser pulses in the χ (3) regime allows us to address differently localized trion and exciton states, thereby avoiding many-body interactions and excitation-induced dephasing. The signal in the form of photon echoes from the negatively charged A excitons (TA, trions) decays with coherence times varying from 8 up to 60 ps, depending on the trion energy: more strongly localized trions reveal longer coherence dynamics. The localized neutral excitons decay on the picosecond timescale with coherence times up to T2 = 4.5 ps. The coherent dynamics of the XB exciton and TB trion are very short (T2 < 1 ps), which is attributed to the fast energy relaxation from the trion and exciton B states to the respective A states. The trion population dynamics is characterized by the decay time T1, rising from 30 ps to 100 ps with decreasing trion energy.

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Magneto-optical study ofn-type modulation-dopedZnO/MgxZn1−x

Cited by 11 publications

References 30 publications

Magneto-photoluminescence of charged excitons from MgxZn1−xO/ZnO heterojunctions

Magneto-photoluminescence of charged excitons from MgxZn1−xO/ZnO heterojunctions

Lattice, band, and spin engineering in Zn1−xCoxO

Coherent dynamics of localized excitons and trions in ZnO/(Zn,Mg)O quantum wells studied by photon echoes

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