Single-photon emission by semiconductor quantum rings in a photonic crystal

Abstract

Photon correlation measurements on single InAs/ GaAs quantum rings embedded in a photonic crystal lattice demonstrate single-photon emission with g ͑2͒ ͑0͒ values of 0.4 and photon antibunching between the exciton and biexciton emissions. The measured photon antibunching times of the excitons are longer than that of the biexcitons, resulting in the time asymmetry of the exciton-biexciton photon cross-correlation. Phonon sidebands due to the piezoelectric coupling of excitons to acoustic phonons broaden the emission lines and shift them to lower energies at low excitation intensity.

Electronic properties of a defected ring-shaped quantum dot array

“…Semiconductor quantum dots (QDs) trapping a number of carriers have attracted extensive interest during the last decades [1][2][3][4][5][6][7]. Of various kinds of semiconductor quantum structures, besides QDs, mesoscopic and nanoscale quantum rings are a subject of increasing interest for electronic and spintronic applications [2,[7][8][9][10][11][12][13]. In quantum rings, Aharonov-Bohm oscillations [14] of conductance and persistent current [15,16] are observed.…”

Effect of confining potential on the exciton stability at various locations in a parabolic and square quantum ring

“…R J Warburton and their crew reported the change in optical emission of a single QR during the addition of electrons [4]. Photon emission by InAs/GaAs QR has been studied by Gallardo et al [5] Type-II GaSb/GaAs coupled quantum rings has been proposed for device applications [6]. Many of the reports made on QR has been underpinned by many extensive researches.…”

Exciton acoustic–phonon coupling in single In0.4Ga0.6As/GaAs quantum rings

“…Although there have been several theoretical and experimental reports on QRs systems since their realization, the influence of the exciton–phonon coupling on the luminescence line shape remains a matter for discussion. In fact, coupling to acoustic phonons is, in general, not taken into consideration in theoretical modelings, however, its impact on the excitonic line shape is clearly evidenced in many QRs spectra . Giving new insights into the acoustic‐phonon broadening mechanism that controls the exciton dephasing and imposes the real limits to the optical properties of single‐QR emission, is then required.…”