Optical study of the band structure of wurtzite GaP nanowires

Assali, Simone; Greil, Johannes; Zardo, Ilaria; Belabbes, Abderrezak; Moor, Michiel W. A. de; Koelling, Sebastian; Koenraad, P. M.; Bechstedt, F.; Bakkers, Erik P. A. M.; Haverkort, J.E.M.

doi:10.1063/1.4959147

Cited by 36 publications

(81 citation statements)

References 63 publications

(103 reference statements)

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“…3) в точности совпадает со спектром ФЛ вюрцитных ННК GaP, по-лученных ранее в [22] при аналогичных плотности возбуждения и температуре. Самый интенсивный пик в спектре ФЛ с максимумом при 2.14 эВ соответствует, по-видимому, связанному экситону на глубоком примесном центре, а остальные, более длинноволновые максимумы, соответствуют его LO/TO фононным репликам [22,23]. Такой вид спектра ФЛ является характерным для ННК с гексагональной кристаллической структурой [1,22].…”

Section: международный симпозиум " нанофизика и наноэлектроника"unclassified

XXI Международный симпозиум Нанофизика и наноэлектроника", Нижний Новгород, 13-16 марта 2017 г. Нитевидные нанокристаллы GaP/Si (111), синтезированные методом молекулярно-пучковой эпитаксии с переключением гексагональной и кубической фазy -=SUP=-*-=/SUP=-

Штром¹,

Сибирев²,

Убыйвовк³

et al. 2018

Физика И Техника Полупроводников

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A theoretical and experimental description of the synthesis of GaP nanowire crystals by molecularbeam epitaxy on Si(111) substrates with the use of gold as a catalyst is presented. The ratio between the fluxes of materials to be deposited and the substrate temperature are varied for a short time during nanowire synthesis in order to analyze the possibility of producing nanoinclusions of different polytypes. It is established that variations in the ratio between the fluxes of materials to be deposited and in the growth temperature bring about the controllable formation of inclusions, among them are structurally cubic crystalline regions. The inclusions are several nanometers thick.

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Section: международный симпозиум " нанофизика и наноэлектроника"unclassified

XXI Международный симпозиум Нанофизика и наноэлектроника", Нижний Новгород, 13-16 марта 2017 г. Нитевидные нанокристаллы GaP/Si (111), синтезированные методом молекулярно-пучковой эпитаксии с переключением гексагональной и кубической фазy -=SUP=-*-=/SUP=-

Штром¹,

Сибирев²,

Убыйвовк³

et al. 2018

Физика И Техника Полупроводников

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“…4 Recent photoluminescence (PL) studies on WZ GaP NWs provided a deeper understanding on the band gap and excitonic emission in this material system. 5,6 However, additional knowledge on the WZ GaP parameters such as the refractive index would be beneficial for the design of opto-electrical devices based on WZ GaP. In this work, we report a method to estimate the refractive index for materials which are available only in the nanowire geometry.…”

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confidence: 99%

“…The NWs used in this work were grown according to the recipe provided in our earlier publications, 5,6 resulting in the WZ GaP/Al 0.4 Ga 0.6 P core/shell NWs with lengths above 6 lm and diameters of approximately 220 nm. For micro-PL measurements, the NWs were transferred to a thermally oxidized Si wafer with gold markers and cooled down to 4 K. The optical data were collected in the backscattering geometry using a NA ¼ 0.7 Nikon 50Â CR objective, and a 0.30 m spectrometer equipped with 1200 g/mm grating (500 nm blazing angle).…”

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confidence: 99%

“…For the fundamental HE 11 mode, the electric field is tightly confined in the nanowire, having a maximum field in the nanowire's center and an electric field polarized perpendicular to the nanowire, allowing for efficient coupling with the emitting dipoles due to the wurtzite selection rules. 6 The next tightly confined mode is the TE 01 mode with a field intensity equal to zero along the nanowire axis and thus limited spatial overlap with emitting dipoles close to the nanowire's center. In Fig.…”

mentioning

confidence: 99%

“…21,22 In addition, the transparency of WZ GaP for wavelengths above 569 nm (Ref. 6) combined with the extremely high value of the refractive index may provide applications as a 1D metamaterial, [23][24][25] where a control of the optical path of the light without absorption is required.…”

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confidence: 99%

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High refractive index in wurtzite GaP measured from Fabry-Pérot resonances

Assali

Dam

Haverkort

et al. 2016

Applied Physics Letters

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We investigate the optical emission of wurtzite GaP/Al0.4Ga0.6P core/shell nanowires (NWs) transferred to a SiOx substrate to demonstrate a high degree of waveguiding of the emitted photoluminescence (PL) signal. By analysing the Fabry-Pérot mode spacing in combination with calculations of the guided modes in the NWs, we calculate a very high refractive index of bulk WZ GaP of 4.2 at a wavelength of 600 nm. The measured quality factors up to 600 indicate the excellent optical quality of the nanowire resonator.

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Forbidden Band‐Edge Excitons of Wurtzite‐GaP: A Theoretical View

Belabbes

Bechstedt

2018

Physica Status Solidi (b)

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By means of an approximate quasiparticle description we study the electronic structure of wurtzite-GaP in more detail for the two lowest Γ 8c and Γ 7c conduction bands and the three highest Γ 9v , Γ 7þv , and Γ 7Àv valence bands. We conclude that the corresponding three gaps between the valence bands and the Γ 8c conduction band are quasi-direct, while the ones involving the s-like Γ 7c conduction band are direct. The optical oscillator strengths are also calculated outside the Γ point. Their influence on the observability of excitons in absorption and emission spectra is investigated. The almost dipoleforbidden transitions into the lowest p-like Γ 8c conduction band become substantial for finite wave vectors perpendicular to the c-axis. Therefore, the finite extent of the exciton envelope functions gives rise to non-vanishing transition strengths, which explain the intense photoluminescence observed experimentally by forbidden p-type excitons.

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Optical study of the band structure of wurtzite GaP nanowires

Cited by 36 publications

References 63 publications

High refractive index in wurtzite GaP measured from Fabry-Pérot resonances

Forbidden Band‐Edge Excitons of Wurtzite‐GaP: A Theoretical View

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