Exciton states in a nanocup in the presence of a perpendicular magnetic field

Arsoski, V.; Čukarić, N.; Tadić, M.; Peeters, F. M.

doi:10.1088/0031-8949/2012/t149/014054

Cited by 6 publications

(12 citation statements)

References 16 publications

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“…Nevertheless, the amplitudes of both the HH and multiband exciton energy level oscillations are of the same order of magnitude, which is 0.1 meV. It agrees well with recent measurements on self-assembled type-I quantum rings 10,11 , but it is larger than what we previously computed for cup-shaped islands 17 . Furthermore, because the magnitude and period of the oscillations for different η are close to each other, and three values of η correspond to three cross sections of the realistic structure, we deduce that the lack of axial symmetry would indeed have a small effect on the excitonic AB variations, as inferred in Sec.…”

Section: 20supporting

confidence: 91%

“…17 The value of the relative permittivity is determined from ǫ(x) = 15.1 − 2.87x + 0.67x 2 (Ref. 10), for the assumed molar fraction value x=0.5.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

“…When the QR opening is covered by the material of the ring, the AB oscillations of the single-particle states are considerably modified 12,15,[17][18][19] . In view of the recent experimental discovery of the excitonic AB effect in type-I quantum rings 10,11 , a few issues deserve special attention.…”

Section: Introductionmentioning

confidence: 99%

“…Second, band mixing could have an important impact on the hole states, and in turn their dependence of the exciton ground state energy on the magnetic field 20,22 . Third, recent theoretical results have indicated that the spatial variation of strain in fully opened quantum rings is beneficial for the appearance and the magnitude of excitonic AB oscillations 17,20 . Strain could lead to an effective separation of the electron and hole, thereby increasing the exciton polarization.…”

Section: Introductionmentioning

confidence: 99%

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Strain and band-mixing effects on the excitonic Aharonov-Bohm effect in In(Ga)As/GaAs ringlike quantum dots

2013

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Neutral excitons in strained axially symmetric In(Ga)As/GaAs quantum dots with ringlike shape are investigated. Similar to experimental self-assembled quantum rings, the analyzed quantum dots have volcano-like shapes. The continuum mechanical model is employed to determine the strain distribution, and the single-band envelope function approach is adopted to compute the electron states. The hole states are determined by the axially symmetric multiband Luttinger-Kohn Hamiltonian, and the exciton states are obtained from an exact diagonalization. We found that the presence of the inner layer covering the ring opening enhances the excitonic Aharonov-Bohm (AB) oscillations. The reason is that the hole becomes mainly localized in the inner part of the quantum dot due to strain, whereas the electron resides mainly inside the ring-shaped rim. Interestingly, larger AB oscillations are found in the analyzed quantum dot than in a fully opened quantum ring of the same width. Comparison with the unstrained ring-like quantum dot shows that the amplitude of the excitonic Aharonov-Bohm oscillations are almost doubled in the presence of strain. The computed oscillations of the exciton energy levels are comparable in magnitude to the oscillations measured in recent experiments.

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Section: 20supporting

confidence: 91%

“…17 The value of the relative permittivity is determined from ǫ(x) = 15.1 − 2.87x + 0.67x 2 (Ref. 10), for the assumed molar fraction value x=0.5.…”

Section: Numerical Results and Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Strain and band-mixing effects on the excitonic Aharonov-Bohm effect in In(Ga)As/GaAs ringlike quantum dots

2013

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“…Time su obuhvaćeni često razmatrani slučajevi vertikalno ili/i lateralno spregnutih kvantnih tačaka i prstenova. Posebno interesantan slučaj predstavlja nanošoljica Arsoski et al, 2012), kod koje je osnova disk na koji naleţe prsten. Na ovaj način u model se unosi korekcija koja uračunava uticaj nepotpunog otvora kod napregnutih samoasembliranih prstenova dobijenih SK metodom narastanja.…”

Section: Strukture Sa Pravolinijskim Segmentima Na Granici Između Tačunclassified

The exciton structure and optical properties of semiconductor nanodots and nanorings

Arsoski¹

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Self-organized Quantum Rings: Physical Characterization and Theoretical Modeling

Fomin¹,

Gladilin²,

Bree³

et al. 2018

Physics of Quantum Rings

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Exciton states in a nanocup in the presence of a perpendicular magnetic field

Cited by 6 publications

References 16 publications

Strain and band-mixing effects on the excitonic Aharonov-Bohm effect in In(Ga)As/GaAs ringlike quantum dots

Strain and band-mixing effects on the excitonic Aharonov-Bohm effect in In(Ga)As/GaAs ringlike quantum dots

The exciton structure and optical properties of semiconductor nanodots and nanorings

Self-organized Quantum Rings: Physical Characterization and Theoretical Modeling

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