Excitonic fine structure splitting in type-II quantum dots

KŘÁPEK, Vlastimil, Petr KLENOVSKÝ and Tomáš ŠIKOLA. Excitonic fine structure splitting in type-II quantum dots. Physical Review B. COLLEGE PK: The American Physical Society, 2015, vol. 92, No 19, p. "nestránkováno", 9 pp. ISSN 1098-0121. Available from: https://dx.doi.org/10.1103/PhysRevB.92.195430.

Basic information

• Original name: Excitonic fine structure splitting in type-II quantum dots
• Authors: KŘÁPEK, Vlastimil (203 Czech Republic), Petr KLENOVSKÝ (203 Czech Republic, guarantor, belonging to the institution) and Tomáš ŠIKOLA (203 Czech Republic).
• Edition: Physical Review B, COLLEGE PK, The American Physical Society, 2015, 1098-0121.

Other information

• Original language: English
• Type of outcome: Article in a journal
• Field of Study: 10302 Condensed matter physics
• Country of publisher: United States of America
• Confidentiality degree: is not subject to a state or trade secret
• WWW: URL
• Impact factor: Impact factor: 3.736 in 2014
• RIV identification code: RIV/00216224:14310/15:00080412
• Organization unit: Faculty of Science
• Doi: http://dx.doi.org/10.1103/PhysRevB.92.195430
• UT WoS: 000365507900004
• Keywords in English: POLARIZATION-ENTANGLED PHOTONS; WAVELENGTH LIGHT-EMISSION; STRAIN-REDUCING LAYER; OPTICAL-PROPERTIES; MU-M; GAASSB; NANOCRYSTALS; PHOTOLUMINESCENCE; LOCALIZATION; RELAXATION
• Tags: AKR, rivok
• Tags: International impact, Reviewed

Abstract

Excitonic fine structure splitting in quantum dots is closely related to the lateral shape of the wave functions. We have studied theoretically the fine structure splitting in InAs quantum dots with a type-II confinement imposed by a GaAsSb capping layer. We show that very small values of the fine structure splitting comparable with the natural linewidth of the excitonic transitions are achievable for realistic quantum dots despite the structural elongation and the piezoelectric field. For example, varying the capping layer thickness allows for a fine tuning of the splitting energy. The effect is explained by a strong sensitivity of the hole wave function to the quantum dot structure and a mutual compensation of the electron and hole anisotropies. The oscillator strength of the excitonic transitions in the studied quantum dots is comparable to those with a type-I confinement which makes the dots attractive for quantum communication technology as emitters of polarization-entangled photon pairs.

Links

• CZ.1.07/2.3.00/20.0027, interní kód MU(CEP code: EE2.3.20.0027): Name: NANOE - Posílení excelence vědeckých týmů v oblasti nano- a mikrotechnologií (Acronym: NANOE)

Investor: Ministry of Education, Youth and Sports of the CR, Support of Excellence Research Teams in the Field of Nanotechnologies and Microtechnologies, 2.3 Human resources in research and development

• ED1.1.00/02.0068, research and development project: Name: CEITEC - central european institute of technology
• MUNI/A/1496/2014, interní kód MU: Name: Struktura, elektronová struktura a optická odezva pokročilých materiálů IV

Investor: Masaryk University, Category A

• TH01010419, research and development project: Name: Výzkum a vývoj nových technologií výroby bipolárního tranzistoru s izolovaným hradlem (TIGBT)

Investor: Technology Agency of the Czech Republic