Dr. Constantine Yannouleas

Ph.D. in Nuclear Theory, 1982, University of Maryland at College Park

Senior Research Scientist
Center for Computational Materials Science

Coordinates:

Address:	School of Physics Georgia Tech Atlanta, GA 30332-0430
Office:	Howey Bldg., Room W403D
Phone:	(404) 894-1164
Fax:	(404) 894-9958 or (404) 894-7747
E-mail:	ph274cy [at] prism.gatech.edu or constantine.yannouleas [at] physics.gatech.edu or yannouleas [at] mailaps.org

Nanoscience Research topics and Current fields of interest

Theoretical development of fundamental aspects and computational applications of many-body methods (at zero and finite temperature) to describing ground-state properties, electronic spectra, plasmon-like oscillations, decay, fragmentation, and fission, as well as the emergence of collective behavior and collective excitations in condensed-matter, finite-size systems and nanostructures; such as metal clusters, complex carbon clusters (e.g., fullerenes, and fullerene onions and coaxial nanotubes), helium-3 clusters, metallic nanowires and nanoconstrictions, two-dimensional semiconductor and graphene quantum dots, and rotating bosons in harmonic traps. This area of research is highly interdisciplinary and overlaps with several fields, such as condensed-matter physics, materials science, computational physics, mesoscopics, physical chemistry, inorganic and organic chemistry, quantum chemistry, few-body systems, the fractional quantum Hall effect, atomic and molecular physics, Bose-Einstein condensation, nuclear physics, astrophysics, and quantum computing.

Review article

C. Yannouleas and U. Landman,
SYMMETRY BREAKING AND QUANTUM CORRELATIONS IN FINITE SYSTEMS: STUDIES OF QUANTUM DOTS AND ULTRACOLD BOSE GASES AND RELATED NUCLEAR AND CHEMICAL METHODS,
Rep. Prog. Phys. 70 (2007) pp. 2067-2148
click here to download the published paper (PDF)

For a complete list of publications, see below

Examples of strongly correlated behavior in artificial nanostructures

Unrestricted Hartree-Fock electron density in a parabolic quantum dot for the case of 19 electrons at zero magnetic field, exhibiting breaking of the circular symmetry and formation of a Wigner crystallite (or Wigner molecule). For details, see publication No. 67.

Conditional Probability Distributions for N=7 electrons at high magnetic fields (the electronic wave functions are restricted to the lowest Landau level). The example shown corresponds to magic angular momentum L=105 (nu=1/5). LEFT: the case of the rotating Wigner molecule (RWM); CENTER: the exact-diagonalization (EXD) case; RIGHT: the case of the Jastrow-Laughlin (JL) wave function. Unlike the RWM wave function, the JL wave function fails to capture the crystalline character of the EXD state. For details, see publications No. 71 and 68.

For additional examples (presented at the APS MARCH2004 meeting) click here

Publications (since 1992)

CLICK HERE TO SEE EARLIER PUBLICATIONS

CLICK HERE TO SEARCH FOR CITATIONS ACCORDING TO THE ISI WEB SITE

Metal Clusters

C. Yannouleas, E. Vigezzi, P-F. Bortignon and R.A. Broglia,
RPA DESCRIPTION OF OPTICAL PROPERTIES OF SODIUM MICROCLUSTERS,
in "Cluster Models for Surface and Bulk Phenomena", pp. 41-50 (G. Pacchioni et al. Eds.), Plenum, New York (1992).
P. Jena, C. Yannouleas, S.N. Khanna and B.K. Rao,
CLUSTERS - A LINK BETWEEN CONDENSED MATTER PHYSICS AND NUCLEAR PHYSICS,
in "Recent Progress in Many-Body Theory", Vol. 3, pp. 135-144, Plenum, New York, (1992).
S.N. Khanna, C. Yannouleas, and P. Jena,
ROLE OF VALENCE ELECTRONS ON THE STRUCTURE AND PROPERTIES OF MICROCLUSTERS,
in "Clustering Phenomena in Atoms and Nuclei", pp. 421 - 434, Springer Verlag, Berlin, (1992).
C. Yannouleas,
FROM THE CATIONIC TO THE ANIONIC ALKALI CLUSTERS: HOW THE PHOTOABSORPTION DEPENDS UPON THE TOTAL CHARGE,
Chem. Phys. Lett. 193 (1992) pp. 587 - 593
click here to download the published paper (PDF)
C. Yannouleas and R.A. Broglia,
LANDAU DAMPING AND WALL DISSIPATION IN LARGE METAL CLUSTERS,
Ann. of Phys. (N.Y.) 217 (1992) pp. 105 - 141
click here to download the published paper (PDF, 7MB)
C. Yannouleas, P. Jena and S.N. Khanna,
OPTICAL RESONANCES IN BIMETALLIC CLUSTERS AND THEIR RELATION TO THE ELECTRONIC STRUCTURE,
Phys. Rev. B 46 (1992) pp. 9751 - 9760
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P. Jena, S.N. Khanna, and C. Yannouleas,
COMMENT ON "PATTERNS AND BARRIERS FOR FISSION OF CHARGED SMALL METAL CLUSTERS",
Phys. Rev. Lett. 69 (1992) p. 1471
R.N. Barnett, C. Yannouleas, and U. Landman,
SMALL CAN BE DIFFERENT,
Z. Phys. D26 (1993) pp. 119 - 226
C. Yannouleas, E. Vigezzi and R.A. Broglia,
EVOLUTION OF THE OPTICAL PROPERTIES OF ALKALI-METAL MICROCLUSTERS TOWARDS THE BULK: THE MATRIX RANDOM-PHASE APPROXIMATION DESCRIPTION,
Phys. Rev. B 47 (1993) pp. 9849 - 9861
click here to download the published paper (PDF)
C. Yannouleas and U. Landman,
MULTIPLY CHARGED ANIONIC METAL CLUSTERS,
Chem. Phys. Lett. 210 (1993) pp. 437 - 442
click here to download the published paper (PDF)
C. Yannouleas and U. Landman,
SHELL-CORRECTION METHOD FOR CALCULATING THE BINDING ENERGY OF METAL CLUSTERS: APPLICATION TO MULTIPLY CHARGED ANIONS,
Phys. Rev. B 48 (1993) pp. 8376 - 8388
click here to download the published paper (PDF)
R.A. Broglia, P.-F. Bortignon, and C. Yannouleas,
THE ELECTROMAGNETIC RESPONSE OF METAL CLUSTERS AND NUCLEI,
in "Perspectives in Many-Particle Physics", pp. 171 - 204, (R.A. Broglia and J.R. Schrieffer, Eds.), North-Holland, Amsterdam, (1994), Course CXXI of the International School of Physics Enrico Fermi.
C. Yannouleas and U. Landman,
ELECTRONIC SHELL EFFECTS IN TRIAXIALLY DEFORMED METAL CLUSTERS: A SYSTEMATIC INTERPRETATION OF EXPERIMENTAL OBSERVATIONS,
Phys. Rev. B 51 (1995) pp. 1902-1917
click here to download the published paper (PDF)
C. Yannouleas, F. Catara, and N. Van Giai,
GROUND-STATE CORRELATIONS AND LINEAR RESPONSE OF METAL CLUSTERS,
Phys. Rev. B 51 (1995) pp. 4569 - 4578
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C. Yannouleas, R.N. Barnett, and U. Landman,
ELECTRONIC SHELL EFFECTS IN FISSION BARRIERS AND FISSION DYNAMICS OF METAL CLUSTERS,
Comm. At. Mol. Phys. 31 (1995) pp. 445 - 460
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C. Yannouleas and U. Landman,
BARRIERS AND DEFORMATION IN FISSION OF CHARGED METAL CLUSTERS,
J. Phys. Chem. (Letter) 99 (1995) pp. 14577 - 14581
click here to download the published paper (PDF)
C. Yannouleas and U. Landman,
SHELL-CORRECTION METHODS FOR CLUSTERS: THEORY AND APPLICATIONS,
in "Large Clusters of Atoms and Molecules", pp. 131 - 200, (T.P. Martin, Ed.), Kluwer Academic Publishers, Dordrecht, (1996), NATO ASI Series E, Vol. 313.
C. Yannouleas and U. Landman,
ELECTRONIC ENTROPY, SHELL STRUCTURE, AND SIZE-EVOLUTIONARY PATTERNS OF METAL CLUSTERS,
Phys. Rev. Lett. 78 (1997) pp. 1424 - 1427
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C. Yannouleas and U. Landman,
COMMENT ON ``DENSITY FUNCTIONAL THEORY STUDY OF SOME STRUCTURAL AND ENERGETIC PROPERTIES OF SMALL LITHIUM CLUSTERS'',
J. Chem. Phys. 107 (1997) pp. 1032 - 1033
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C. Yannouleas and U. Landman,
MOLECULAR DYNAMICS IN SHAPE SPACE AND FEMTOSECOND VIBRATIONAL SPECTROSCOPY OF METAL CLUSTERS,
J. Phys. Chem. A (Letter) 102 (1998) pp. 2505 - 2508
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C. Yannouleas,
MICROSCOPIC DESCRIPTION OF THE SURFACE DIPOLE PLASMON IN LARGE Na_N CLUSTERS (950 <= N <= 12050),
Phys. Rev. B 58 (1998) pp. 6748 - 6751
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C. Yannouleas, U. Landman, and R.N. Barnett,
DISSOCIATION, FRAGMENTATION, AND FISSION OF SIMPLE METAL CLUSTERS,
contributed chapter to the book Metal Clusters, edited by W. Ekardt (John-Wiley, New York, 1999) pp. 145 - 180
click here to download the chapter from the e-print archive at LANL

click here to see the table of contents for this book
C. Yannouleas and U. Landman,
DECAY CHANNELS AND APPEARANCE SIZES OF DOUBLY ANIONIC GOLD AND SILVER CLUSTERS,
Rhys. Rev. B 61 (2000) pp. R10587 - R10589, Rapid Communication
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C. Yannouleas, U. Landman, A. Herlert, and L. Schweikhard,
MULTIPLY CHARGED METAL CLUSTER ANIONS,
Phys. Rev. Lett. 86 (2001) pp. 2996 - 2999
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U. Landman, R.N. Barnett, M. Moseler, and C. Yannouleas,
SPONTANEOUS SYMMETRY BREAKING IN FINITE SYSTEMS - JETS, CLUSTER FISSION, AND QUANTUM DOTS,
in "The Physics and Chemistry of Clusters", Proceedings of the Nobel Symposium 117, June 27 - July 2, 2000, Visby, Sweden, edited by E.E.B. Campbell and M. Larsson, (World Scientific, Singapore, 2001) pp. 42 - 68.
C. Yannouleas, U. Landman, A. Herlert, and L. Schweikhard,
TRIANIONIC GOLD CLUSTERS,
Eur. Phys. J. D 16 (2001) pp. 81 - 85.
click here to download the paper from the Chemistry Preprint Server
click here to download the published paper (PDF)
C. Yannouleas and U. Landman, Guest Editors ,
PROCEEDINGS OF THE 10th INTERNATIONAL SYMPOSIUM ON SMALL PARTICLES AND INORGANIC CLUSTERS, 11-15 October 2000, Atlanta, Georgia
Special issue: Eur. Phys. J. D, Vol. 16, No. 1-3 (2001)
C. Yannouleas, U. Landman, C. Brechignac, Ph. Cahuzac, B. Concina, and J. Leygnier,
THERMAL QUENCHING OF ELECTRONIC SHELLS AND CHANNEL COMPETITION IN CLUSTER FISSION,
Phys. Rev. Lett. 89 (2002) 173403 (4 pages)
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C. Yannouleas and U. Landman,
SHELL-CORRECTION AND ORBITAL-FREE DENSITY-FUNCTIONAL METHODS FOR FINITE SYSTEMS,
to appear in "Recent Advances in Orbital-Free Density Functional Theory," edited by Y. A. Wang and T. A. Wesolowski (World Scientific, Singapore, 2009)
click here to download the preprint

Helium-3 Clusters
C. Yannouleas and U. Landman,
SHAPES OF $^3$He CLUSTERS,
Phys. Rev. B 54 (1996) pp. 7690 - 7693
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C. Yannouleas and U. Landman,
SHELL STRUCTURE AND SHAPES OF FERMION MICROSYSTEMS: A COMPARATIVE STUDY OF $^3$He AND Na CLUSTERS,
J. Chem. Phys. 105 (1996) pp. 8734 - 8740
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Complex Carbon Aggregates
C. Yannouleas and U. Landman,
STABILIZED-JELLIUM DESCRIPTION OF NEUTRAL AND MULTIPLY CHARGED FULLERENES C$^{x \pm}_{60}$,
Chem. Phys. Lett. 217 (1994) pp. 175 - 185
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C. Yannouleas, E.N. Bogachek, and U. Landman,
DIMENSIONALITY CROSSOVERS OF THE $\sigma$-PLASMON IN COAXIAL CARBON NANOTUBES,
Phys. Rev. B 50 (1994) pp. 7977 - 7980
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C. Yannouleas, E.N. Bogachek, and U. Landman,
COLLECTIVE EXCITATIONS OF MULTISHELL CARBON MICROSTRUCTURES: MULTISHELL FULLERENES AND COAXIAL NANOTUBES,
Phys. Rev. B 53 (1996) pp. 10225 - 10236
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Metallic Nanowires
C. Yannouleas and U. Landman,
ON MESOSCOPIC FORCES AND QUANTIZED CONDUCTANCE IN MODEL METALLIC NANOWIRES,
J. Phys. Chem. B (Letter) 101 (1997) pp. 5780 - 5783
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C. Yannouleas, E.N. Bogachek, and U. Landman,
ENERGETICS, FORCES, AND QUANTIZED CONDUCTANCE IN JELLIUM-MODELLED METALLIC NANOWIRES,
Phys. Rev. B 57 (1998) pp. 4872 - 4882
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Two-dimensional Quantum Dots (Artificial Atoms and Molecules)
C. Yannouleas and U. Landman,
SPONTANEOUS SYMMETRY BREAKING IN SINGLE AND MOLECULAR QUANTUM DOTS,
Phys. Rev. Lett. 82 (1999) pp. 5325 - 5328; (E) Phys. Rev. Lett. 85 (2000) p. 2220
click here to download the paper from the e-print archive at LANL
click here to download the published paper (PDF)
click here to download the published erratum (PDF)
R.N. Barnett, C.L. Cleveland, H. Hakkinen, W.D. Luedtke, C. Yannouleas, and U. Landman,
STRUCTURES AND SPECTRA OF GOLD NANOCLUSTERS AND QUANTUM DOT MOLECULES,
ISSPIC9 Conference Proceedings
Eur. Phys. J. D 9 (1999) pp. 95 - 104
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C. Yannouleas and U. Landman,
FORMATION AND CONTROL OF ELECTRON MOLECULES IN ARTIFICIAL ATOMS: IMPURITY AND MAGNETIC-FIELD EFFECTS,
Phys. Rev. B 61 (15 June 2000) pp. 15895 - 15904
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C. Yannouleas and U. Landman,
COLLECTIVE AND INDEPENDENT-PARTICLE MOTION IN TWO-ELECTRON ARTIFICIAL ATOMS,
Phys. Rev. Lett. 85 (21 August 2000) pp. 1726 - 1729
click here to download the paper from the e-print archive at LANL (BEST ENLARGED FIGURES)
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C. Yannouleas and U. Landman,
COUPLING AND DISSOCIATION IN ARTIFICIAL MOLECULES,
Eur. Phys. J. D 16 (2001) pp. 373 - 380
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C. Yannouleas and U. Landman,
STRONGLY CORRELATED WAVE FUNCTIONS FOR ARTIFICIAL ATOMS AND MOLECULES,
J. Phys.: Condens. Matter 14 (2002) pp. L591 - L598 (Letter)
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C. Yannouleas and U. Landman,
MAGNETIC-FIELD MANIPULATION OF CHEMICAL BONDING IN ARTIFICIAL MOLECULES,
Int. J. Quantum Chem. 90 (2002) pp. 699 - 708
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C. Yannouleas and U. Landman,
TRIAL WAVE FUNCTIONS WITH LONG-RANGE COULOMB CORRELATIONS FOR TWO-DIMENSIONAL N-ELECTRON SYSTEMS IN HIGH MAGNETIC FIELDS,
Physical Review B 66 (2002) 115315 (5 pages)
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C. Yannouleas and U. Landman,
GROUP THEORETICAL ANALYSIS OF SYMMETRY BREAKING IN TWO-DIMENSIONAL QUANTUM DOTS,
Physical Review B 68 (2003) 035325 (16 pages)
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C. Yannouleas and U. Landman,
QUANTUM DOTS IN HIGH-MAGNETIC FIELDS: ROTATING-WIGNER-MOLECULE VERSUS COMPOSITE-FERMION APPROACH,
Physical Review B 68 (2003) 035326 (11 pages)
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For establishing priority claim, see an earlier short version:
TWO-DIMENSIONAL FEW ELECTRON SYSTEMS IN HIGH MAGNETIC FIELDS:
COMPOSITE-FERMION OR ROTATING-ELECTRON-MOLECULE APPROACH?
click here to download the paper from the arXiv.org e-Print archive
M. Taut, U. Landman, and C. Yannouleas,
TIME EVOLUTION OF INITIALLY LOCALIZED STATES IN TWO-DIMENSIONAL QUANTUM DOT ARRAYS IN A MAGNETIC FIELD,
Physica E 24 (2004) pp. 308 - 317.
C. Yannouleas and U. Landman,
UNIFIED DESCRIPTION OF FLOPPY AND RIGID ROTATING WIGNER MOLECULES FORMED IN QUANTUM DOTS,
Physical Review B 69 (2004) 113306 (4 pages)
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C. Yannouleas and U. Landman,
STRUCTURAL PROPERTIES OF ELECTRONS IN QUANTUM DOTS IN HIGH MAGNETIC FIELDS: CRYSTALLINE CHARACTER OF CUSP STATES AND EXCITATION SPECTRA,
Phys. Rev. B 70 (2004) 235319 (9 pages)
click here to download the paper from the arXiv.org e-Print archive
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For establishing priority claim, see an earlier short version:
CRYSTALLINE CHARACTER OF HIGH-MAGNETIC-FIELD CUSP STATES IN QUANTUM DOTS,
click here to download the paper from the arXiv.org e-Print archive
Yuesong Li, C. Yannouleas, and U. Landman,
FROM A FEW TO MANY ELECTRONS IN QUANTUM DOTS UNDER STRONG MAGNETIC FIELDS: PROPERTIES OF ROTATING ELECTRON MOLECULES WITH MULTIPLE RINGS,
Physical Review B 73 (2006) 075301 (14 pages)
click here to download a preprint with high quality figures (PDF)
click here to download the paper from the arXiv.org e-Print archive
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For establishing priority claim, see an earlier short version:
FINITE ELECTRON CRYSTALLITES IN STRONG MAGNETIC FIELDS: PRECURSORS OF A SUPERSOLID?
click here to download the paper from the arXiv.org e-Print archive
C. Yannouleas and U. Landman,
ELECTRON AND BOSON CLUSTERS IN CONFINED GEOMETRIES: SYMMETRY BREAKING IN QUANTUM DOTS AND HARMONIC TRAPS,
Proc. Natl. Acad. Sci. (USA) 103 (2006) pp. 10600 - 10605 (Special Feature)
click here to download the paper from the arXiv.org e-Print archive
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For establishing priority claim, see an earlier short version:
ELECTRON LOCALIZATION AND ENTANGLEMENT IN A TWO-ELECTRON ELLIPTICAL QUANTUM DOT,
click here to download the paper from the arXiv.org e-Print archive
C. Yannouleas and U. Landman,
SYMMETRY BREAKING AND WIGNER MOLECULES IN FEW-ELECTRON QUANTUM DOTS,
Proceedings TNT2005 (Trends in Nanotechnology), Invited-talk paper,
Physica status solidi (a) 203 (2006) pp. 1160 - 1171.
RIGHTCLICK to download the published article (PDF)
C. Ellenberger, T. Ihn, C. Yannouleas, U. Landman, K. Ensslin, D.C. Driscoll, and A.C. Gossard,
EXCITATION SPECTRUM OF TWO CORRELATED ELECTRONS IN A LATERAL QUANTUM DOT WITH NEGLIGIBLE ZEEMAN SPLITTING,
Phys. Rev. Lett. 96, 126806 (2006); 4 pages
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T. Ihn, C. Ellenberger, K. Ensslin, C. Yannouleas, U. Landman, D.C. Driscoll, and A.C. Gossard,
EXCITATION SPECTRA OF TWO CORRELATED ELECTRONS IN A QUANTUM DOT,
AIP Conf. Proc. 893, 783 (2007) (2 pages)
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T. Ihn, C. Ellenberger, K. Ensslin, C. Yannouleas, U. Landman, D.C. Driscoll, and A.C. Gossard,
QUANTUM DOTS BASED ON PARABOLIC QUANTUM WELLS: IMPORTANCE OF ELECTRONIC CORRELATIONS,
International Journal of Modern Physics B 21, 1316 (2007) (10 pages)
Invited-talk paper to the Proceedings of the "17th International Conference on High Magnetic Fields in Semiconductor Physics", Wuerzburg, Germany (July 30 - August 4, 2006)
click here to download the paper from the arXiv.org e-Print archive
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Yuesong Li, C. Yannouleas, and U. Landman,
THREE-ELECTRON ANISOTROPIC QUANTUM DOTS IN VARIABLE MAGNETIC FIELDS: EXACT RESULTS FOR EXCITATION SPECTRA, SPIN STRUCTURES, AND ENTANGLEMENT,
Phys. Rev. B 76, 245310 (2007) (12 pages)
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click here to download the paper from the arXiv.org e-Print archive
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L. O. Baksmaty, C. Yannouleas, and U. Landman,
NONUNIVERSAL TRANSMISSION PHASE LAPSES THROUGH A QUANTUM DOT: AN EXACT-DIAGONALIZATION OF THE MANY-BODY TRANSPORT PROBLEM,
Phys. Rev. Lett. 101, 136803 (2008) (4 pages)
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Ying Li, C. Yannouleas, and U. Landman,
ARTIFICIAL QUANTUM-DOT HELIUM MOLECULES: ELECTRONIC SPECTRA, SPIN STRUCTURES, AND HEISENBERG CLUSTERS,
Physical Review B 80, 045326 (2009) (17 pages),
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Bosons in harmonic and toroidal traps
I. Romanovsky, C. Yannouleas, and U. Landman,
CRYSTALLINE BOSON PHASES IN HARMONIC TRAPS: BEYOND THE GROSS-PITAEVSKII MEAN FIELD,
Physical Review Letters 93, 230405 (2004) (4 pages)
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I. Romanovsky, C. Yannouleas, L. O. Baksmaty, and U. Landman,
BOSONIC MOLECULES IN ROTATING TRAPS,
Physical Review Letters 97, 090401 (2006) (4 pages)
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L. O. Baksmaty, C. Yannouleas, and U. Landman,
RAPIDLY ROTATING BOSON MOLECULES WITH LONG- OR SHORT-RANGE REPULSION: AN EXACT DIAGONALIZATION STUDY,
Physical Review A 75, 023620 (2007) (14 pages)
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I. Romanovsky, C. Yannouleas, and U. Landman,
SYMMETRY-CONSERVING VORTEX CLUSTERS IN SMALL ROTATING CLOUDS OF ULTRACOLD BOSONS,
Physical Review A 78, 011606 (2008), Rapid Communication (4 pages),
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click here to download the paper from the arXiv.org e-Print archive
C. Yannouleas and U. Landman,
QUANTAL MOLECULAR DESCRIPTION AND UNIVERSAL ASPECTS OF THE SPECTRA OF BOSONS AND FERMIONS IN THE LOWEST LANDAU LEVEL,
Physical Review A (2010), in press (16 pages)
click here to download the paper from the arXiv.org e-Print archive

Graphene and graphene quantum dots
I. Romanovsky, C. Yannouleas, and U. Landman,
EDGE STATES IN GRAPHENE QUANTUM DOTS: FRACTIONAL QUANTUM HALL EFFECT ANALOGIES AND DIFFERENCES AT ZERO MAGNETIC FIELD,
Physical Review B 79, 075311 (2009) (12 pages),
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click here to download the paper from the arXiv.org e-Print archive
I. Romanovsky, C. Yannouleas, and U. Landman,
JOINT MANIFESTATION OF FRACTIONAL QUANTUM HALL EFFECT AND INSULATING BEHAVIOR IN GRAPHENE AT HIGH MAGNETIC FIELDS,
submitted for publication,
click here to download the paper from the arXiv.org e-Print archive

Review article
C. Yannouleas and U. Landman,
SYMMETRY BREAKING AND QUANTUM CORRELATIONS IN FINITE SYSTEMS: STUDIES OF QUANTUM DOTS AND ULTRACOLD BOSE GASES AND RELATED NUCLEAR AND CHEMICAL METHODS,
Rep. Prog. Phys. 70 (2007) pp. 2067-2148
click here to download the published paper (PDF)