Browsing Research Articles (Physics) by Type "Article"

Browsing Research Articles (Physics) by Type "Article"

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  • Ab initio studies of bimetallic-doped {0001} hematite surface for enhanced photoelectrochemical water splitting 
    Simfukwe, Joseph; Mapasha, Refilwe Edwin; Braun, Artur; Diale, M. (Mmantsae Moche) (MDPI, 2021-08)
    First-principles calculations based on density functional theory (DFT) were carried out to study the energetic stability and electronic properties of a bimetallic-doped α-Fe2O3 photoanode surface with (Zn, Ti) and (Zn, ...
  • Ab initio studies of isolated boron substitutional defects in graphane 
    Mapasha, Refilwe Edwin; Chetty, Nithaya (IOP Publishing Limited, 2017)
    We have systematically studied energetics, structural and electronic properties of di erent con gurations of the B atoms substituting C-H pairs located on a single hexagonal ring in a graphane system using the rst-principles ...
  • An ab-initio study of P-type ZrCoY (Y[dbnd]Sb and Bi) half – Heusler semiconductors 
    Allan, Lynet; Mulwa, Winfred M.; Mwabora, Julius M.; Musembi, Robinson J.; Mapasha, Refilwe Edwin (Elsevier, 2023-08)
    Please read abstract in article.
  • Ab-initio study of the optical properties of beryllium-sulphur co-doped graphene 
    Olaniyan, Okikiola; Igumbor, Emmanuel; Khaleed, Abubakar A.; Mirghni, Abdulmajid Abdallah; Manyala, Ncholu I. (American Institute of Physics, 2019)
    Graphene is a carbon material with excellent properties, which makes it applicable in a myriad of applications. However, the range of the applications of graphene can be extended to the developing field of nanoelectronics ...
  • Accuracy of approximate methods for the calculation of absorption-type linear spectra with a complex system–bath coupling 
    Nothling, Johan A.; Mancal, Tomas; Kruger, T.P.J. (Tjaart) (American Institute of Physics, 2022-09)
    Please read abstract in the article.
  • Analytic structure of the multichannel Jost matrix for potentials with Coulombic tails 
    Rakityansky, Sergei Anatoljevich; Elander, N. (American Institute of Physics, 2013-12-31)
    A quantum system is considered that can move in N two-body channels with the potentials that may include the Coulomb interaction. For this system, the Jost matrix is constructed in such a way that all its dependencies ...
  • Ar plasma induced deep levels in epitaxial n-GaAs 
    Venter, Andre; Nyamhere, Cloud; Botha, J.R.; Auret, Francois Danie; Janse van Rensburg, J.P.; Meyer, Walter Ernst; Coelho, Sergio M.M.; Kolkovsky, V.I. (American Institute of Physics, 2012-03-08)
    Ar plasma etching of n-type (Si doped) GaAs introduces several electron traps (Ec - 0.04 eV, Ec - 0.07 eV, Ec - 0.19 eV, Ec - 0.31 eV, Ec - 0.53 eV, and Ec - 0.61 eV). The trap, Ec - 0.04 eV, labelled E10 and having a ...
  • The behavior of hydrothermally synthesized hematite nanorods prepared on spin coated seed layers 
    Talibawo, Joan; Nyarige, Justine Sageka; Kyesmen, Pannan Isa; Cyulinyana, Marie C.; Diale, M. (IOP Publishing, 2022-02)
    Please read abstract in the article.
  • Blue- and red-shifts of V2O5 phonons in NH3 environment by in situ Raman spectroscopy 
    Akande, Amos Adeleke; Machatine, Augusto Gonçalo Jose; Masina, Bathusile; Chimowa, George; Matsoso, Boitumelo; Roro, Kittessa; Duvenhage, Mart-Mari; Swart, Hendrik; Bandyopadhyay, Jayita; Ray, Suprakas Sinha; Mwakikunga, Bonex Wakufwa (IOP Publishing, 2018)
    A layer of ~30 nm V2O5/100 nm-SiO2 on Si was employed in the in situ Raman spectroscopy in the presence of NH3 effluent from a thermal decomposition of ammonium acetate salt with the salt heated at 100 °C. When the layer ...
  • Bullet-like microstructured nickel ammonium phosphate/graphene foam composite as positive electrode for asymmetric supercapacitors 
    Mahmoud, Badr Ahmed Mohammed; Mirghni, Abdulmajid Abdallah; Fasakin, Oladepo; Oyedotun, Kabir Oyeniran; Manyala, Ncholu I. (Royal Society of Chemistry, 2020-04)
    Unique microstructured nickel ammonium phosphate Ni(NH4)2(PO3)4$4H2O and Ni(NH4)2(PO3)4$4H2O/GF composite were successfully synthesized through the hydrothermal method with different graphene foam (GF) mass loading of ...
  • The challenges of developing computational physics : the case of South Africa 
    Salagaram, Trisha; Chetty, Nithaya (IOP Publishing Limited, 2013-11-21)
    Most modern scientific research problems are complex and interdisciplinary in nature. It is impossible to study such problems in detail without the use of computation in addition to theory and experiment. Although it is ...
  • Characterization of the E(0.31) defect introduced in bulk n-Ge by H or He plasma exposure 
    Nyamhereme, C.; Venter, Andre; Auret, Francois Danie; Coelho, Sergio M.M.; Murape, D.M. (American Institute of Physics, 2012-02-29)
    Bulk antimony (Sb) doped germanium (n-Ge) samples with doping concentrations ranging between 7.0 1014 cm 3 and 2.5 1015 cm 3 were exposed to a dc-hydrogen or helium plasma. Hydrogen exposure resulted in the introduction ...
  • Classical typicality of the canonical distribution 
    Plastino, Angel Ricardo (Angelo); Daffertshofer, A. (EPLA, 2008-11)
    We consider the typicality of the canonical ensemble’s probability distribution from a classical perspective, resuming recent discussions on quantum-mechanical aspects of canonical typicality. In the conventional derivation ...
  • Collimated synchrotron threads linking the radio lobes of ESO 137-006 
    Ramatsoku, Mpati; Murgia, M.; Vacca, V.; Serra, P.; Makhathini, Sphesihle; Govoni, F.; Smirnov, Oleg M.; Andati, L.A.L.; De Blok, E.; Józsa, G.I.G.; Kamphuis, P.; Kleiner, D.; Maccagni, F.M.; Molnár, D.C.; Ramaila, A.J.T.; Thorat, Kshitij; White, Sarah V. (EDP Sciences, 2020-04)
    We present MeerKAT 1000 MHz and 1400 MHz observations of a bright radio galaxy in the southern hemisphere, ESO 137-006. The galaxy lies at the centre of the massive and merging Norma galaxy cluster. The MeerKAT continuum ...
  • A compact streak camera for 150 fs time resolved measurement of bright pulses in ultrafast electron diffraction 
    Kassier, Gunther Horst; Haupt, K.; Erasmus, N.; Rohwer, E.G.; Von Bergmann, H.M.; Schwoerer, H.; Coelho, Sergio M.M.; Auret, Francois Danie (American Institute of Physics (AIP), 2010-10)
    We have developed a compact streak camera suitable for measuring the duration of highly charged subrelativistic femtosecond electron bunches with an energy bandwidth in the order of 0.1%, as frequently used in ultrafast ...
  • Comparative study of the electrical properties of Pd/ZnO Schottky contacts fabricated using electron beam deposition and resistive/thermal evaporation techniques 
    Mtangi, Wilbert; Auret, Francois Danie; Janse van Rensburg, Pieter Johan; Coelho, Sergio M.M.; Legodi, Matshisa Johannes; Meyer, Walter Ernst; Chawanda, Albert (American Institute of Physics, 2011-11)
    A systematic investigation to check the quality of Pd Schottky contacts deposited on ZnO has been performed on electron beam (e-beam) deposited and resistively/thermally evaporated samples using current-voltage, IV, and ...
  • Conformational switching in a light-harvesting protein as followed by single-molecule spectroscopy 
    Gall, Andrew; Ilioaia, Cristian; Kruger, T.P.J. (Tjaart); Novoderezhkin, Vladimir I.; Robert, Bruno; Van Grondelle, Rienk (Biophysical Society, 2015-06)
    Among the ultimate goals of protein physics, the complete, experimental description of the energy paths leading to protein conformational changes remains a challenge. Single protein fluorescence spectroscopy constitutes ...
  • Constraints on black-hole charges with the 2017 EHT observations of M87* 
    Kocherlakota, Prashant; Rezzolla, Luciano; Falcke, Heino; Fromm, Christian M.; Kramer, Michael; Mizuno, Yosuke; Nathanail, Antonios; Olivares, Hector; Younsi, Ziri; Akiyama, Kazunori; Alberdi, Antxon; Alef, Walter; Algaba, Juan Carlos; Anantua, Richard; Asada, Keiichi; Azulay, Rebecca; Baczko, Anne-Kathrin; Ball, David; Baloković, Mislav; Barrett, John; Benson, Bradford A.; Bintley, Dan; Blackburn, Lindy; Blundell, Raymond; Boland, Wilfred; Bouman, Katherine L.; Bower, Geoffrey C.; Boyce, Hope; Bremer, Michael; Brinkerink, Christiaan D.; Brissenden, Roger; Britzen, Silke; Broderick, Avery E.; Broguiere, Dominique; Bronzwaer, Thomas; Byun, Do-Young; Carlstrom, John E.; Chael, Andrew; Chan, Chi-kwan; Chatterjee, Shami; Chatterjee, Koushik; Chen, Ming-Tang; Chen, Yongjun; Chesler, Paul M.; Cho, Ilje; Christian, Pierre; Conway, John E.; Cordes, James M.; Crawford, Thomas M.; Crew, Geoffrey B.; Cruz-Osorio, Alejandro; Cui, Yuzhu; Davelaar, Jordy; De Laurentis, Mariafelicia; Deane, Roger; Dempsey, Jessica; Desvignes, Gregory; Doeleman, Sheperd S.; Eatough, Ralph P.; Farah, Joseph (American Physical Society, 2021-05-20)
    Our understanding of strong gravity near supermassive compact objects has recently improved thanks to the measurements made by the Event Horizon Telescope (EHT). We use here the M87* shadow size to infer constraints on the ...
  • Correlation between barrier heights and ideality factors of Ni/n-Ge (100) schottky barrier diodes 
    Chawanda, Albert; Nel, Jacqueline Margot; Auret, Francois Danie; Mtangi, Wilbert; Nyamhere, Cloud; Diale, M. (Mmantsae Moche); Leach, Lindsay Josephine (Korean Physical Society, 2010-12)
    We computed the homogeneous Schottky barrier height (SBH) at ideality factor (n) = 1.0 of Ni/n- Ge (100) Schottky diodes (SDs). The SDs were identically prepared by using resistive evaporation of Ni on n-Ge (100). The ...
  • Critical exponents in percolation model of track region 
    Demchyshyn, A.B.; Selyshchev, Pavel (Sumy State University, 2012-03-14)
    Numerous experiments on defect formation in insulators, metals, alloys, and amorphous semiconductors have shown that these materials are sensitive to track formation when they are bombarded by swift heavy ions (SHI). Detail ...