Browsing by Subject "Energy gap"

Now showing items 1-20 of 21

    • Article  

      Ab-initio electronic structure calculations and properties of [SixSn1 − x]3N4 ternary nitrides 

      Pavloudis, T.; Zervos, Matthew; Komninou, P.; Kioseoglou, J. (2016)
      We carry out ab initio electronic structure calculations of (SixSn1 − x)3N4 using density functional theory with projector augmented-wave potentials under the generalized gradient approximation. We find that the energetically ...
    • Article  

      Central pseudorapidity gaps in events with a leading antiproton at the Fermilab tevatron pp collider 

      Acosta, D.; Affolder, T.; Akimoto, H.; Albrow, M. G.; Ambrose, D.; Amidei, D.; Anikeev, K.; Antos, J.; Apollinari, G.; Arisawa, T.; Artikov, A.; Asakawa, T.; Ashmanskas, W.; Azfar, F.; Azzi-Bacchetta, P.; Bacchetta, N.; Bachacou, H.; Badgett, W.; Bailey, S.; de Barbaro, P.; Barbaro-Galtieri, A.; Barnes, V. E.; Barnett, B. A.; Baroiant, S.; Barone, M.; Bauer, G.; Bedeschi, F.; Behari, S.; Belforte, S.; Bell, W. H.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Bensinger, J.; Beretvas, Andrew; Berryhill, J.; Bhatti, A.; Binkley, M.; Bisello, D.; Bishai, M.; Blair, R. E.; Blocker, C.; Bloom, K.; Blumenfeld, B.; Blusk, S. R.; Bocci, A.; Bodek, A.; Bolla, G.; Bolshov, A.; Bonushkin, Yu Ye; Bortoletto, D.; Boudreau, J.; Brandl, A.; Bromberg, C.; Brozovic, M.; Brubaker, E.; Bruner, N.; Budagov, J.; Budd, H. S.; Burkett, K.; Busetto, G.; Byrum, K. L.; Cabrera, S.; Calafiura, P.; Campbell, M.; Carithers, W.; Carlson, J.; Carlsmith, D.; Caskey, W.; Castro, A.; Cauz, D.; Cerri, A.; Cerrito, L.; Chan, A. W.; Chang, P. S.; Chang, P. T.; Chapman, J.; Chen, C.; Chen, Y. C.; Cheng, M. -T; Chertok, M.; Chiarelli, G.; Chirikov-Zorin, I.; Chlachidze, G.; Chlebana, F.; Christofek, L.; Chu, M. L.; Chung, J. Y.; Chung, W. H.; Chung, Y. S.; Ciobanu, C. I.; Clark, A. G.; Coca, M.; Colijn, A. P.; Connolly, A.; Convery, M.; Conway, J.; Cordelli, M.; Cranshaw, J.; Culbertson, R.; Dagenhart, D.; D'Auria, S.; de Cecco, S.; DeJongh, F.; Dell'Agnello, Simone; Dell'Orso, M.; Demers, S.; Demortier, L.; Deninno, M.; de Pedis, D.; Derwent, P. F.; Devlin, T.; Dionisi, Carlo; Dittmann, J. R.; Dominguez, A.; Donati, S.; D'Onofrio, M.; Dorigo, T.; Eddy, N.; Einsweiler, K.; Engels Jr., E.; Erbacher, R.; Errede, D.; Errede, S.; Eusebi, R.; Fan, Q.; Fang, H. -C; Farrington, S.; Feild, R. G.; Fernandez, J. P.; Ferretti, C.; Field, R. D.; Fiori, I.; Flaugher, B.; Flores-Castillo, L. R.; Foster, G. W.; Franklin, M.; Freeman, J.; Friedman, J.; Fukui, Y.; Furic, I.; Galeotti, S.; Gallas, A.; Gallinaro, M.; Gao, T.; Garcia-Sciveres, M.; Garfinkel, A. F.; Gatti, P.; Gay, C.; Gerdes, D. W.; Gerstein, E.; Giagu, S.; Giannetti, P.; Giolo, K.; Giordani, M.; Glagolev, V.; Glenzinski, D.; Gold, M.; Goldschmidt, N.; Goldstein, J.; Gomez, G.; Goncharov, M.; Gorelov, I.; Goshaw, A. T.; Gotra, Y.; Goulianos, Konstantin; Green, C.; Gresele, A.; Grim, G.; Grosso-Pilcher, C.; Guenther, M.; Guillian, G.; Guimaraes da Costa, J.; Haas, R. M.; Haber, C.; Hahn, S. R.; Halkiadakis, Eva; Hall, C.; Handa, T.; Handler, R.; Happacher, F.; Hara, K.; Hardman, A. D.; Harris, R. M.; Hartmann, F.; Hatakeyama, K.; Hauser, J.; Heinrich, J.; Heiss, A.; Hennecke, M.; Herndon, M.; Hill, C.; Hocker, A.; Hoffman, K. D.; Hollebeek, R.; Holloway, L.; Hou, S.; Huffman, B. T.; Hughes, R.; Huston, J.; Huth, J.; Ikeda, H.; Issever, C.; Incandela, J.; Introzzi, G.; Iori, M.; Ivanov, A.; Iwai, J.; Iwata, Y.; Iyutin, B.; James, E.; Jones, M.; Joshi, U.; Kambara, H.; Kamon, T.; Kaneko, T.; Kang, J.; Karagoz Unel, M.; Karr, K.; Kartal, S.; Kasha, H.; Kato, Y.; Keaffaber, T. A.; Kelley, K.; Kelly, M.; Kennedy, R. D.; Kephart, R.; Khazins, D.; Kikuchi, T.; Kilminster, B.; Kim, B. J.; Kim, D. H.; Kim, H. S.; Kim, M. J.; Kim, S. B.; Kim, S. H.; Kim, T. H.; Kim, Y. K.; Kirby, M.; Kirk, M.; Kirsch, L.; Klimenko, S.; Koehn, P.; Kondo, K.; Konigsberg, J.; Korn, A.; Korytov, A.; Kotelnikov, K.; Kovács, Eve V.; Kroll, J.; Kruse, M.; Krutelyov, V.; Kuhlmann, S. E.; Kurino, K.; Kuwabara, T.; Kuznetsova, N.; Laasanen, A. T.; Lai, N.; Lami, S.; Lammel, S.; Lancaster, J.; Lannon, K.; Lancaster, M.; Lander, R.; Lath, A.; Latino, G.; LeCompte, T.; Le, Y.; Lee, J.; Lee, S. W.; Leonardo, N.; Leone, S.; Lewis, J. D.; Li, K.; Lin, C. S.; Lindgren, M.; Liss, T. M.; Liu, J. B.; Liu, T.; Liu, Y. C.; Litvintsev, D. O.; Lobban, O.; Lockyer, N. S.; Loginov, A.; Loken, J.; Loreti, M.; Lucchesi, D.; Lukens, P.; Lusin, S.; Lyons, L.; Lys, J.; Madrak, R.; Maeshima, K.; Maksimovic, P.; Malferrari, L.; Mangano, M.; Manca, G.; Mariotti, M.; Martignon, G.; Martin, M.; Martin, A.; Martin, V.; Martinez, M.; Matthews, J. A. J.; Mazzanti, P.; McFarland, K. S.; McIntyre, P.; Menguzzato, M.; Menzione, A.; Merkel, P.; Mesropian, C.; Meyer, A.; Miao, T.; Miller, R.; Miller, J. S.; Minato, H.; Miscetti, S.; Mishina, M.; Mitselmakher, G.; Miyazaki, Y.; Moggi, N.; Moore, E.; Moore, R.; Morita, Y.; Moulik, T.; Mulhearn, M.; Mukherjee, A.; Muller, T.; Munar, A.; Murat, P.; Murgia, S.; Nachtman, J.; Nagaslaev, V.; Nahn, S.; Nakada, H.; Nakano, I.; Napora, R.; Niell, F.; Nelson, C.; Nelson, T.; Neu, C.; Neubauer, M. S.; Neuberger, D.; Newman-Holmes, C.; Ngan, C. -Y P.; Nigmanov, T.; Niu, H.; Nodulman, L.; Nomerotski, A.; Oh, S. H.; Oh, Y. D.; Ohmoto, T.; Ohsugi, T.; Oishi, R.; Okusawa, T.; Olsen, J.; Orejudos, W.; Pagliarone, C.; Palmonari, F.; Paoletti, R.; Papadimitriou, Vaia; Partos, D.; Patrick, J.; Pauletta, G.; Paulini, M.; Pauly, T.; Paus, C.; Pellett, D.; Penzo, A.; Pescara, L.; Phillips, T. J.; Piacentino, G.; Piedra, J.; Pitts, K. T.; Pompoš, A.; Pondrom, L.; Pope, G.; Pratt, T.; Prokoshin, F.; Proudfoot, J.; Ptohos, Fotios; Pukhov, O.; Punzi, G.; Rademacker, J.; Rakitine, A.; Ratnikov, F.; Ray, H.; Reher, D.; Reichold, A.; Renton, P.; Rescigno, M.; Ribon, A.; Riegler, W.; Rimondi, F.; Ristori, L.; Robertson, W. J.; Rodrigo, T.; Rolli, S.; Rosenson, L.; Roser, R.; Rossin, R.; Rott, C.; Roy, A.; Ruiz, A.; Ryan, D.; Safonov, A.; Denis, R. S.; Sakumoto, W. K.; Saltzberg, D.; Sanchez, C.; Sansoni, A.; Santi, L.; Sarkar, S.; Sato, H.; Savoy-Navarro, A.; Schlabach, P.; Schmidt, E. E.; Schmidt, M. P.; Schmitt, M.; Scodellaro, L.; Scott, A.; Scribano, A.; Sedov, A.; Seidel, S.; Seiya, Y.; Semenov, A.; Semeria, F.; Shah, T.; Shapiro, M. D.; Shepard, P. F.; Shibayama, T.; Shimojima, M.; Shochet, M.; Sidoti, A.; Siegrist, J.; Sill, A.; Singh, P.; Slaughter, A. J.; Sliwa, K.; Snider, F. D.; Snihur, R.; Solodsky, A.; Spalding, J.; Speer, T.; Spezziga, M.; Sphicas, Paris A.; Spinella, F.; Spiropulu, Maria; Spiegel, L.; Steele, J.; Stefanini, A.; Strologas, John; Strumia, F.; Stuart, D.; Sukhanov, A.; Sumorok, K.; Suzuki, T.; Takano, T.; Takashima, R.; Takikawa, K.; Tamburello, P.; Tanaka, M.; Tannenbaum, B.; Tecchio, M.; Tesarek, R. J.; Teng, P. K.; Terashi, K.; Tether, S.; Thom, J.; Thompson, A. S.; Thomson, E.; Thurman-Keup, R.; Tipton, P.; Tkaczyk, S.; Toback, D.; Tollefson, K.; Tonelli, D.; Tonnesmann, M.; Toyoda, H.; de Trocóniz, J. F.; Tseng, J.; Tsybychev, D.; Turini, N.; Ukegawa, F.; Unverhau, T.; Vaiciulis, T.; Valls, J.; Varganov, A.; Vataga, E.; Vejcik III, S.; Velev, G.; Veramendi, G.; Vidal, R.; Vila, I.; Vilar, R.; Volobouev, I.; von der Mey, M.; Vucinic, D.; Wagner, R. G.; Wagner, R. L.; Wagner, W.; Wallace, N. B.; Wan, Z.; Wang, C.; Wang, M. J.; Wang, S. M.; Ward, B.; Waschke, S.; Watanabe, T.; Waters, D.; Watts, T.; Weber, M.; Wenzel, H.; Wester III, W. C.; Whitehouse, B.; Wicklund, A. B.; Wicklund, E.; Wilkes, T.; Williams, H. H.; Wilson, P.; Winer, B. L.; Winn, D.; Wolbers, S.; Wolinski, D.; Wolinski, J.; Wolinski, S.; Wolter, M.; Worm, S.; Wu, X.; Würthwein, F.; Wyss, J.; Yang, U. K.; Yao, W.; Yeh, G. P.; Yeh, P.; Yi, K.; Yoh, J.; Yosef, C.; Yoshida, T.; Yu, I.; Yu, S.; Yu, Z.; Yun, J. C.; Zanello, L.; Zanetti, A.; Zetti, F.; Zucchelli, S. (2003)
      The results from a similar measurement performed in a subsample of pp events containing a leading (high longitudinal momentum) antiproton. As such, large pseudorapidity gaps are presumed to be due to Pomeron exchanges and ...
    • Article  

      Compact EBG-Backed Planar Monopole for BAN Wearable Applications 

      Abbasi, M. A. B.; Nikolaou, S. S.; Antoniades, Marcos A.; Nikolić Stevanović, M.; Vryonides, P. (2017)
      This paper presents a planar monopole backed with a 2 × 1 array of electromagnetic bandgap (EBG) structures. The reflection phase of a single EBG unit cell has been studied and exploited toward efficient radiation of a ...
    • Conference Object  

      Conformai wearable monopole antenna backed by a compact EBG structure for body area networks 

      Antoniades, Marcos A.; Abbasi, M. A. B.; Nikolic, M.; Vryonides, P.; Nikolaou, S. (Institute of Electrical and Electronics Engineers Inc., 2017)
      A compact planar monopole antenna backed by an electromagnetic bandgap (EBG) structure is presented. The antenna is conformal to the human body and is intended for wearable applications in wireless body area networks. It ...
    • Article  

      Electron transfer through fluctuating bridges: On the validity of the superexchange mechanism and time-dependent tunneling matrix elements 

      Skourtis, Spiros S.; Archontis, Georgios Z.; Xie, Q. (2001)
      An attempt is made to find the most general description of the superexchange mechanism that is valid for time-dependent donor-bridge-acceptor systems. Time-dependent electron-transfer probabilities that involve single MD ...
    • Article  

      Excitation dynamics of a low bandgap silicon-bridged dithiophene copolymer and its composites with fullerenes 

      Othonos, Andreas S.; Itskos, Grigorios; Neophytou, Marios; Choulis, Stelios A. (2012)
      We report on excitation dynamics in pristine and bulk heterojunction films of the low bandgap silicon-bridged dithiophene copolymer poly[(4,4′-bis(2- ethylhexyl)dithieno[3,2-b:2′, 3′-d]silole)-2,6-diyl-alt-(4,7-bis(2- ...
    • Article  

      Geometrically strained carbenes: Interdependence among geometry, spin multiplicity and reactivity 

      Takahashi, Y.; Nicolaïdes, Andrew N.; Tomioka, H. (2001)
      The singlet and triplet states of cyclobutenylidene 1 and benzocyclobutenylidene 2 have been studied computationally (using ab initio and DFT methods) in order to assess the effect of angle strain on the S-T gap of vinyl- ...
    • Article  

      High-resolution quadrature photopyroelectric spectroscopy of a-Si:H thin films deposited on silicon wafers 

      Shen, Jun; Mandelis, Andreas; Othonos, Andreas S.; Vanniasinkam, Joseph (1995)
      The recently developed photothermal technique of quadrature photopyroelectric spectroscopy (Q-PPES) has been applied to measurements of amorphous Si thin films deposited on crystalline Si substrates. Direct, meaningful ...
    • Article  

      Highly anisotropic crystal growth and thermoelectric properties of K 2Bi 8-xSb xSe 13 solid solutions: Band gap anomaly at low x 

      Kyratsi, Theodora; Dyck, J. S.; Chen, W.; Chung, D. Y.; Uher, C.; Paraskevopoulos, K. M.; Kanatzidis, M. G. (2002)
      The thermoelectric properties of solid solutions of the type β-K 2Bi 8-xSb xSe 13 (0<x<8) were studied with respect to thermal behavior, band gap variation, and charge transport properties as a function of x. At x values ...
    • Article  

      Light-induced mobility enhancement in delta-doped GaAs/In0.26Ga0.74As/GaAs quantum wells grown by molecular beam epitaxy on GaAs(001) 

      Zervos, Matthew; Elliott, M.; Westwood, D. I. (1999)
      Persistent photoconductivity in 80 angstroms strained GaAs/In0.26Ga0.74As/GaAs quantum wells was investigated by measuring the Shubnikov de Haas and Hall effects at 4.2 K. The quantum wells were grown by molecular beam ...
    • Article  

      Optical and electrical properties of selectively delta-doped strained InxGa1-xAs/GaAs quantum wells 

      Ke, M. L.; Chen, X.; Zervos, Matthew; Nawaz, R.; Elliott, M.; Westwood, D. I.; Blood, P.; Godfrey, M. J.; Williams, R. H. (1996)
      We report here an investigation of selectively delta-doped strained InGaAs/GaAs quantum wells. Electronic structures of the systems were calculated by self-consistently solving the Schrödinger and Poisson equations and the ...
    • Article  

      Optical properties of polyelectrolyte quantum dot multilayer films prepared using the layer by layer self-assembly method 

      Lioudakis, Emmanouil E.; Koupanou, E.; Kanari, C.; Leontidis, Epameinondas; Othonos, Andreas S. (2008)
      In this work, we have used spectroscopic ellipsometry to study the optical properties of polyelectrolyte-PbS quantum dot (QD) multilayer films prepared using the layer by layer self-assembly method. The optical results ...
    • Article  

      Quantum confinement and interface structure of Si nanocrystals of sizes 3-5 nm embedded in a-SiO2 

      Lioudakis, Emmanouil E.; Othonos, Andreas S.; Hadjisavvas, G. C.; Kelires, P. C.; Nassiopoulou, Androula Galiouna (2007)
      Spectroscopic ellipsometry and Monte Carlo simulations are employed to answer the fundamental question whether the energy gaps of Si nanocrystals with sizes in the range of 3-5 nm, which are embedded in amorphous silica, ...
    • Article  

      Structural and electronic properties of bare and capped Cd nSe n/Cd nTe n Nanoparticles (n = 6, 9) 

      Kuznetsov, A. E.; Balamurugan, D.; Skourtis, Spiros S.; Beratan, David N. (2012)
      Relationships between structures and properties (energy gaps, vertical ionization potentials (IP v), vertical electron affinities (EA v), and ligand binding energies) in small capped CdSe/CdTe nanoparticles (NPs) are poorly ...
    • Article  

      Syntheses, crystal Structures and electronic Structures of new metal chalcoiodides Bi2CuSe3I and Bi6Cu3S10I 

      Liang, I.-C.; Bilc, D. I.; Manoli, M.; Chang, W.-Y.; Lin, W.-F.; Kyratsi, Theodora; Hsu, K. F. (2016)
      Two new metal chalcoiodides were synthesized by solid-state reactions at 400 °C. Crystal Data: Bi2CuSe3I, 1, monoclinic, C2/m, a=14.243(2) Å, b=4.1937(7) Å, c=14.647(2) Å, β=116.095(2)°, V=785.7(2) Å3, and Z=4
    • Article  

      Temporal evolution of effects of ultrafast carrier dynamics in In 0.33Ga0.67N: Above and near the bandgap 

      Lioudakis, Emmanouil E.; Iliopoulos, Eleftherios; Georgakilas, A.; Othonos, Andreas S. (2007)
      Ultrafast carrier dynamics in the In0.33Ga0.67N epilayer were investigated in detail, using femtosecond transient differential non-degenerate optical absorption measurements. Following an excitation at 400 nm with fluence ...
    • Article  

      Tin oxide nanowires: The influence of trap states on ultrafast carrier relaxation 

      Othonos, A.; Zervos, Matthew; Tsokkou, D. (2009)
      We have studied the optical properties and carrier dynamics in SnO 2 nanowires (NWs) with an average radius of 50 nm that were grown via the vapor-liquid solid method. Transient differential absorption measurements have ...
    • Article  

      Tin oxide nanowires: The influence of trap states on ultrafast carrier relaxation 

      Othonos, Andreas S.; Zervos, Matthew; Tsokkou, Demetra (2009)
      We have studied the optical properties and carrier dynamics in SnO 2 nanowires (NWs) with an average radius of 50 nm that were grown via the vapor-liquid solid method. Transient differential absorption measurements have ...
    • Conference Object  

      Tunable excitons in gated graphene systems 

      Djotyan, Anahit P.; Avetisyan, A. A.; Moulopoulos, Konstantinos (SPIE, 2017)
      We develop a microscopic theory of a strong electromagnetic radiation interaction with bilayer graphene where an energy gap is opened by a static electric field perpendicular to graphene planes. We show that an adiabatic ...
    • Article  

      Ultrafast time-resolved spectroscopy of In2 O3 nanowires 

      Tsokkou, Demetra; Othonos, Andreas S.; Zervos, Matthew (2009)
      Ultrafast carrier dynamics in In2 O3 nanowires with an average diameter of ≈100±20 nm grown by the vapor-liquid-solid method have been investigated in detail using differential absorption spectroscopy with femtosecond ...