Evidence of blocking effect on carrier trapping process by necking region in very narrow AlGaAs/GaAs V-grooved quantum wire structure

Liu, X. Q.; Sasaki, Akio; Ohno, Nobutada; Li, Z. F.; Lü, Wei; Shen, S. C.; Fu, Yuwei; Willander, Magnus; Tan, Hark Hoe; Jagadish, Chennupati

doi:10.1063/1.1410317

Cited by 13 publications

(25 citation statements)

References 12 publications

(15 reference statements)

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“…I B, there is also a potential barrier due to the pinch-off regions, which provide 2D confinement within the quantum wire. 31 Adiabatic calculations for this sample indicate that the pinch-off barrier is ∼75 meV and 40 meV for electrons and heavy-holes respectively, which is consistent with the transition between confined QWR states and SQW states seen in Fig. 2(d).…”

Section: A Photoluminescence Measurementssupporting

confidence: 83%

Carrier relaxation inGaAsv-groove quantum wires and the effects of localization

et al. 2004

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Carrier relaxation processes have been investigated in GaAs/AlGaAs v-groove quantum wires (QWRs) with a large subband separation (∆E ≃ 46 meV). Signatures of inhibited carrier relaxation mechanisms are seen in temperature-dependent photoluminescence (PL) and photoluminescenceexcitation (PLE) measurements; we observe strong emission from the first excited state of the QWR below ∼50 K. This is attributed to reduced inter-subband relaxation via phonon scattering between localized states. Theoretical calculations and experimental results indicate that the pinchoff regions, which provide additional two-dimensional confinement for the QWR structure, have a blocking effect on relaxation mechanisms for certain structures within the v-groove. Time-resolved PL measurements show that efficient carrier relaxation from excited QWR states into the ground state, occurs only at temperatures > ∼ 30 K. Values for the low temperature radiative lifetimes of the ground-and first excited-state excitons have been obtained (340 ps and 160 ps respectively), and their corresponding localization lengths along the wire estimated.

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Section: A Photoluminescence Measurementssupporting

confidence: 83%

Carrier relaxation inGaAsv-groove quantum wires and the effects of localization

et al. 2004

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“…An insoluble particulate probe, lithium phthalocyanine (LiPc), has been used widely due to its sensitivity, reproducibility, and reliable quantifying capabilities and can be implanted at predetermined sites where partial pressure of oxygen (pO 2 ) can be monitored several times over days and weeks. [5][6][7][8][9][10] On the other hand, two types of soluble paramagnetic oximetry probes, triarylmethyl radicals and nitroxides, can be infused.…”

mentioning

confidence: 99%

Intracellular Hypoxia of Tumor Tissue Estimated by Noninvasive Electron Paramagnetic Resonance Oximetry Technique Using Paramagnetic Probes

Matsumoto

et al. 2011

Biological & Pharmaceutical Bulletin

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“…EPR oximetry has been used to measure oxygenation in the murine brain,101, 110 heart,111 gastrointestinal tract,112 skeletal muscle,113 liver,114 kidneys,115 and skin,116 as well as in pathophysiological conditions such as cancer 101. 117 It has a high sensitivity at low p O 2 values, and repetitive measurements can be carried out at the same site for long‐term tissue monitoring (Figure 4).…”

Section: Resonance Techniquesmentioning

confidence: 99%

Oxygen‐Sensing Methods in Biomedicine from the Macroscale to the Microscale

et al. 2015

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Oxygen monitoring has been a topic of exhaustive study given its central role in the biochemistry of life. The ability to quantify the physiological distribution and real-time dynamics of oxygen from sub-cellular to macroscopic levels is required to fully understand the mechanisms associated with both normal physiology and disease states. This Review will present the most significant recent advances in the development of oxygen-sensing materials and techniques, including polarographic, nuclear medicine, magnetic resonance, and optical approaches, that can be applied specifically for the real-time monitoring of oxygen dynamics in cellular and tissue environments. As some of the most exciting recent advances in synthetic methods and biomedical applications have been in the field of optical oxygen sensors, a major focus will be on the development of these toolkits.

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Evidence of blocking effect on carrier trapping process by necking region in very narrow AlGaAs/GaAs V-grooved quantum wire structure

Abstract: High thermal stability of AlGaAs/GaAs V-grooved quantum wire

Cited by 13 publications

References 12 publications

Carrier relaxation inGaAsv-groove quantum wires and the effects of localization

Carrier relaxation inGaAsv-groove quantum wires and the effects of localization

Intracellular Hypoxia of Tumor Tissue Estimated by Noninvasive Electron Paramagnetic Resonance Oximetry Technique Using Paramagnetic Probes

Oxygen‐Sensing Methods in Biomedicine from the Macroscale to the Microscale

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