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Two electrons in a strongly coupled double quantum dot: from an artificial helium atom to a hydrogen molecule
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Role Of Finite Hole Mass In The Negatively Charged Exciton In Two Dimensions
No full textThe role of finite hole mass on the ground and excited state of the negatively charged exciton in two dimensions is discussed. The configuration-interaction is analyzed using exact excitonic states. A variational approach is used to study the ground-state energy to show the interplay of finite hole mass and electron-electron interactions.94716722Brum, J.A., Hawrylak, P., (1997) Comments Condens. Matter Phys., 18, p. 135Narvaez, G.A., Brum, J.A., Hawrylak, P., (1998) Proceedings of the 24th International Conference on the Physics of Semiconductors, , in: D. Gershoni (Ed.) Jerusalem World Scientific, SingaporeHawrylak, P., (1991) Phys. Rev. B, 44, p. 3821Uenoyama, T., Sham, L.J., (1990) Phys. Rev. Lett., 65, p. 1048Kheng, K., (1993) Phys. Rev. Lett., 71, p. 1752Finkelstein, G., Shtrikman, H., Bar-Joseph, I., (1995) Phys. Rev. Lett., 74, p. 976Buhmann, H., (1995) Phys. Rev. B, 51, p. 7969Shields, A.J., (1995) Phys. Rev. B, 51, p. 8049Shields, A.J., Pepper, M., Simmons, M.Y., Ritchie, D.A., (1995) Phys. Rev. B, 52, p. 7841Gekhtman, D., Cohen, E., Ron, A., Pfeiffer, L.N., (1996) Phys. Rev. B, 54, p. 10320Glasberg, S., Finkelstein, G., Shtrikman, H., Bar-Joseph, I., (1999) Phys. Rev. B, 59, p. 10425Hayne, M., Jones, C.L., Bogaerts, R., Riva, C., Usher, A., Peeters, F.M., Herlach, F., Henini, M., (1999) Phys. Rev. B, 59, p. 2927Lampert, M., (1958) Phys. Rev. Lett., 1, p. 450Stébé, B., Ainane, A., (1989) Superlatt. Microstruct., 5, p. 545Thilagam, A., (1997) Phys. Rev. B, 55, p. 7804Usukura, J., Suzuki, Y., Varga, K., (1999) Phys. Rev. B, 59, p. 5652Esser, E., Runge, E., Zimmermann, R., Langbein, W., (2000) Phys. Stat. Sol. a, 178, p. 489Riva, C., Peeters, F.M., Varga, K., (2000) Phys. Rev. B, 61, p. 13873Wojs, A., Hawrylak, P., (1995) Phys. Rev. B, 51, p. 10880Palacios, J.J., Yoshioka, D., MacDonald, A.H., (1996) Phys. Rev. B, 54, p. 2296Whittaker, D.M., Shields, A.J., (1997) Phys. Rev. B, 56, p. 15185Stébé, B., Moradi, A., (2000) Phys. Rev. B, 61, p. 2888Hawrylak, P., Grabowski, M., (1994) Phys. Rev. B, 49, p. 8174Shinada, M., Sugano, S., (1966) J. Phys. Soc. Jpn., 21, p. 1936MacDonald, A.H., Ritchie, D.S., (1986) Phys. Rev. B, 33, p. 8386Gradshteyn, I.M., Ryzhik, I.M., (1994) Tables of Integrals, Series, and Products, , in: A. Jeffrey (Ed.) Academic Press, New YorkChandrasekhar, S., (1944) Astrophys. J., 100, p. 176Sandler, N.P., Proetto, C.R., (1992) Phys. Rev. B, 46, p. 7707Mahan, G.D., (1981) Many-particle Physics, , Plenum Press, New York and references thereinPhelps, D.E., Bajaj, K.K., (1983) Phys. Rev. B, 27, p. 4883Larsen, D.M., McCann, S.Y., (1992) Phys. Rev. B, 45, p. 3485Larsen, D.M., McCann, S.Y., (1992) Phys. Rev. B, 46, p. 396
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Magnetoexcitons And Correlated Electrons In Quantum Dots In A Magnetic Field
Full text linkMagnetoexcitons interacting with strongly correlated electronic states in quantum dots in a strong magnetic field are studied. Exact calculations relate the absorption and emission of few-electron artificial atoms to magnetic-field-induced phase transitions between "magic" states. For large compact droplets, the coupling of magnetoexcitons to low-energy excitations (edge magnetorotons) leads to a strong enhancement of the oscillator strength at the Fermi level (Fermi edge singularity) both in absorption and in emission on acceptors. The condensation of edge magnetorotons signals the reconstruction of the droplet and is accompanied by different structures in the absorption spectrum.54161139711409Kastner, M., (1993) Phys. Today, 24 (1), p. 24Chakraborty, T., (1992) Comments Condens. Matter Phys., 16, p. 35Petroff, P.M., Denbaars, S.P., (1994) Superlatt. Microstruct., 15, p. 15Drexler, H., Leonard, D., Hansen, W., Kotthaus, J.P., Petroff, P.M., (1994) Phys. Rev. Lett., 73, p. 2252Wojs, A., Hawrylak, P., (1995) Phys. Rev. B, 51, p. 10880Ashoori, R.C., Stormer, H.L., Weiner, J.S., Pfeiffer, L.N., Baldwin, K.W., West, K.W., (1993) Phys. Rev. Lett., 71, p. 613Su, B., Goldman, V.J., Cunningham, J.E., (1992) Science, 255, p. 313Hawrylak, P., (1993) Phys. Rev. Lett., 71, p. 3347De Chamon, C., Wen, X.-G., (1994) Phys. Rev. B, 49, p. 8227Palacios, J.J., (1993) Europhys. Lett., 23, p. 495(1995) Phys. Rev. B, 51, p. 2363MacDonald, A.H., Eric Yang, S.R., Johnson, M.D., (1993) Aust. J. Phys., 46, p. 345Klein, O., (1995) Phys. Rev. Lett., 74, p. 785Kane, C.L., Fisher, M.P.A., Polchinski, J., (1994) Phys. Rev. Lett., 72, p. 4129Maksym, P.A., (1993) Physica B, 184, p. 385Maksym, P.A., Chakraborty, T., (1990) Phys. Rev. Lett., 65, p. 108(1992) Phys. Rev. B, 45, p. 1947Palacios, J.J., Martin-Moreno, L., Chiappe, G., Louis, E., Tejedor, C., (1994) Phys. Rev. B, 50, p. 5760(1995) Phys. Rev. Lett., 74, p. 5120Apalkov, V.M., Rashba, E.I., (1995) Solid State Commun., 93, p. 193Chen, X.M., Quinn, J.J., (1994) Phys. Rev. B, 50, p. 2354MacDonald, A.H., (1992) Phys. Rev. Lett., 68, p. 1939Buchmann, H., (1990) Phys. Rev. Lett., 65, p. 1056Turb-erfield, A.J., (1990) Phys. Rev. Lett., 65, p. 637Goldberg, B.B., (1990) Phys. Rev. Lett., 65, p. 641Hawrylak, P., (1991) Phys. Rev. B, 44, p. 3821Uneyama, T., Sham, L.J., (1990) Phys. Rev. Lett., 65, p. 1048Hawrylak, P., Pfannkuche, D., (1993) Phys. Rev. Lett., 70, p. 485Pfannkuche, D., (1994) Solid State Electron., 37, p. 1221Apalkov, V.M., Rashba, E.I., (1991) Pis'ma Zh. Éksp. Teor. Fiz., 53, p. 420(1991) JETP Lett., 53, p. 442Hawrylak, P., (1992) Phys. Rev. B, 45, p. 4237Hawrylak, P., Pulsford, N., Ploog, K., (1993) Phys. Rev. B, 46, p. 15593(1992) Solid State Commun., 81, p. 525Petrou, A., Smith, M.C., Perry, C.H., Worlock, J.M., Aggarwal, R.L., (1984) Solid State Commun., 52, p. 93Kukushkin, I.V., Klitzing, K.V., Ploog, K., Timofeev, V.B., (1990) Phys. Rev. B, 40, p. 7788Plaut, A.S., Lage, H., Grambow, P., Heitmann, D., Von Klitzing, K., Ploog, K., (1991) Phys. Rev. Lett., 67, p. 1642Buhmann, H., Joss, W., Von Klitzing, K., Kukushkin, I.V., Martinez, G., Plaut, A.S., Ploog, K., Timofeev, V.B., (1990) Phys. Rev. Lett., 65, p. 1056Buhmann, H., Joss, W., Von Klitzing, K., Kukushkin, I.V., Plaut, A.S., Martinez, G., Ploog, K., Timofeev, V.B., (1991) Phys. Rev. Lett., 66, p. 926Kukushkin, I.V., Pulsford, N.J., Von Klitzing, K., Ploog, K., Haug, R.J., Koch, S., Timofeev, V.B., (1992) Phys. Rev. B, 45, p. 4532Stone, M.D., Wyld, H.W., Schult, R.L., (1992) Phys. Rev. B, 45, p. 14156Stone, M.D., (1990) Int. J. Mod. Phys., 5, p. 503Kallin, C., Halperin, B.I., (1985) Phys. Rev. B, 31, p. 3635Wu, J.-W., Hawrylak, P., Quinn, J.J., (1985) Phys. Rev. B, 31, p. 6592Hawrylak, P., (1995) Phys. Rev. B, 51, p. 1770
Multi-charged Acceptor Centers In P-doped Si/si1 -xgex/si Quantum Wells In The Presence Of A Magnetic Field
No full textNeutral (A0) and positively charged (A+) shallow acceptor centers in p-doped SiGe/Si nanostructures are investigated in the presence of an external magnetic field. The band mixing of valence states, the confinement potential and the magnetic field are responsible for an increase in the binding energy of the system. The properties of the lower-energy states of the A+ are studied and their binding energies calculated for a Si0.87Ge0.13 quantum well. It is shown that the ground state of the A+ complex has a singlet-like parity configuration up to magnetic fields as high as 12 T. The effects of hole-hole repulsive interaction and hole-impurity attractive potential on the A+ spectra are considered. © 1998 Published by Elsevier Science B.V. All rights reserved.21-4785788Shields, A.J., Pepper, M., Ritchie, D.A., Simmons, M.Y., Jones, G.A.C., (1995) Phys. Rev. B, 51, p. 18049Ryu, S.R., Jiang, Z.X., Li, W.J., McCombe, B.D., (1996) Phys. Rev. B, 54, pp. R11086MacDonald, A.H., (1992) Solid State Commun., 84, p. 109Hawrylak, P., (1993) Solid State Commun., 88, p. 475Broido, D., Sham, L.J., (1985) Phys. Rev. B, 31, p. 888Bir, G.L., Pikus, G.E., (1974) Symmetry and Strain-Inducted Effects in Semiconductors, , Wiley, New YorkMadelung, O., (1987) Landolt&Bernstein: Semiconductors, Physics of Group IV and III-V Compounds, 3-17 A. , Springer, BerlinRego, L.G.C., Hawrylak, P., Brum, J.A., Wojs, A., (1997) Phys. Rev. B, 55, p. 15694Wagner, M., Merket, U., Chaplik, A.V., (1992) Phys. Rev. B, 45, p. 1951Ashoori, R.C., Stormer, H.L., Weiner, J.S., Pfeiffer, L.N., Baldwin, K.W., West, K.W., (1993) Phys. Rev. Lett., 71, p. 61
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
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