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    ABSTRACT: We present a theoretical study of Coulomb-exchange interaction for electrons confined in a cylindrical quantum wire and subject to a Rashba-type spin-orbit coupling with radial electric field. The effect of spin splitting on the single-particle band dispersions, the quasiparticle effective mass, and the system's total exchange energy per particle are discussed. Exchange interaction generally suppresses the quasiparticle effective mass in the lowest nanowire sub-band, and a finite spin splitting is found to significantly increase the magnitude of the quasiparticle-mass suppression (by up to 15% in the experimentally relevant parameter regime). In contrast, spin-orbit coupling causes a modest (1%-level) reduction of the magnitude of the exchange energy per particle. Our results shed light on the interplay of spin-orbit coupling and Coulomb interaction in quantum-confined systems, including those that are expected to host exotic quasiparticle excitations.
    No preview · Article · Sep 2015 · Physical Review B
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    ABSTRACT: Photoinduced absorption signals measured by transient absorption spectroscopy are typically proportional to the product of absorption cross section (sigma) and excited-state density (N). We show that this approximation does not hold at high probe-pulse intensities, and introduce the use of probe-intensity-dependent spectroscopy to decouple the two parameters. The singlet excited-state (S-1 -> S-2) absorption cross section of the conjugated polymer F8BT is measured to be 1.6 x 10(-16) cm(2) +/- 40% at 800 nm and 3.7 x 10(-16) cm(2) +/- 30% at 900 nm, with no variation over the time window surveyed. The robustness of these parameters is established by observing that only N scales with excitation fluence and time delay, and conversely only s is dependent on probe wavelength. The technique may be useful for quantifying salient parameters in many systems, such as branching yields in systems exhibiting singlet fission or triplet production, or cross sections required for photophysical models.
    No preview · Article · Aug 2015 · Physical Review Applied
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    ABSTRACT: Current approaches of designing and refurbishing residential buildings in urban developments to achieve net zero emission performance focus mainly on operational energy largely in terms of thermal aspects. The embodied energy of buildings and systems and additionally the transport energy of their users are typically overlooked. More recent studies have revealed that these two energy demands can represent more than half of the life cycle energy for over 50 years. This paper initiates an approach which takes into account the energy requirements at the building scale (i.e. embodied and operational of the building and its systems) and the city scale i.e. transport energy (both direct and indirect) of the users of a net zero emission house located in Auckland, New Zealand and evaluates its energy consumption and CO2 emissions. In addition it investigates various scenarios related to transport technology focusing on internal combustion engine vehicles (ICEVs) and battery powered electric vehicles (BPEVs). The main conclusion is that there is a need to develop integrated tools which should enhance the efficiency of net zero emission houses and user transportation modes in a single framework such that each of the embodied, operational and transport energy emissions attributed to the building users can be reduced in order to move towards a low energy society.
    No preview · Article · Aug 2015 · Energy Procedia

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Top publications last week by reads

 
Comparative Biochemistry and Physiology Part B Biochemistry and Molecular Biology 09/2000; 126(4):455-76. DOI:10.1016/S0305-0491(00)00233-9
1k Reads
 
Natural Product Reports 02/2014; 31(2):160-258. DOI:10.1039/c3np70117d
173 Reads

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Collaborations

This map visualizes which other institutions researchers from Victoria University of Wellington have collaborated with.

Rg score distribution

See how the RG Scores of researchers from Victoria University of Wellington are distributed.