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The primary goal of our research is to tackle some of the main unsolved
conceptual issues in the field of complex materials, with major emphasis
on the study of the elementary excitations. To learn about
specific projects, please see our research highlights
or follow these links:
The essence of strongly correlated electron systems is the subtle
coupling and competition between electron, lattice, orbital and spin
degrees of freedom. These interactions lead to the emergence of exciting novel ground
states and phase transitions where a new picture for quasiparticles
needs to be defined.
Examples of systems
where this situation occurs are: high temperature
superconductors, colossal magnetoresistance manganites, organic superconductors,
Kondo systems, ruthenates, carbon based materials, dilute magnetic
semiconductors, ferroelectrics, and many more.
The absence of a proper description for complex materials is now asking
for a careful and direct investigation of elementary excitations, as
they reflect the interplay between the low-energy degrees of freedom and
determine fundamental macroscopic physical properties. This
investigation will contribute to uncovering the mysteries of the
electron correlation problem and provide the basis for future
development of new technological materials with tailored properties.
Selected Publications
(please see Publications for a
more complete listing):
Unusual oxygen
isotope effects in cuprates - importance of doping
G.-H. Gweon, T.
Sasagawa, H. Takagi, D.-H. Lee, A. Lanzara
cond-mat/0708.1027
In-plane
copper-oxygen bond-stretching mode anomaly in underdoped La2-xSrxCuO4+d
measured with high-resolution inelastic x-ray scattering
J. Graf, M. d'Astuto,
P. Giura, A. Shukla, N.L. Saini, A. Bossak, M. Krisch, S.-W. Cheong, T.
Sasagawa, A. Lanzara
Phys. Rev. B 76, 172507 (2007)
Universal
waterfalls-like feature in the spectral function of high temperature
superconductors
J. Graf, G.-H.
Gweon, A. Lanzara
Physica C
460-462, 194-197 (2007), preprint at
cond-mat/0610313
Probing the band structure
of LaTe2 using Angle Resolved Photoemission Spectroscopy
D.R. Garcia, S.Y.
Zhou, G.-H. Gweon, M.H. Jung, Y.S. Kwon, A. Lanzara
J. Elec. Spec. Relat.
Phenom. 156-158, 58 (2007). Preprint at
cond-mat/0703556
Revealing Charge Density
Wave formation in the LaTe2 system by Angle Resolved Photoemission
Spectroscopy
D.R.Garcia, G.-H.
Gweon, S.Y. Zhou, J. Graf, C.M. Jozwiak, M.H. Jung, Y.S. Kwon, A. Lanzara
Phys. Rev. Lett. 98, 166403 (2007). Preprint at
cond-mat/0703535
Universal high energy
anomaly in the electron spectrum of high temperature superconductors by
angle-resolved photoemission spectrascopy
J. Graf, G.-H.
Gweon, K. McElroy, S.Y. Zhou, C. Jozwiak, E. Rotenberg, A. Bill, T.
Sasagawa, H. Eisaki, S. Uchida, H. Takagi, D.-H. Lee, and A. Lanzara
Phys. Rev. Lett. 98,
067004 (2007),
cond-mat/0607319
Non-Migdal-Eliashberg electron-lattice
interaction in optimally doped Bi2Sr2CaCu2O8+x
G.-H. Gweon, S. Y. Zhou, M. C. Watson, T.
Sasagawa, H. Takagi, and A. Lanzara
Phys. Rev. Lett. 97, 227001 (2006)
Elastic scattering
susceptibility of the high-temperature superconductor Bi2Sr2CaCu2O8+d: A comparison
between real and momentum space spectroscopy
K. McElroy, G.-H.
Gweon, S. Y. Zhou, J. Graf, S. I. Uchida, H. Eisaki, H. Takagi, T.
Sasagawa, D.-H. Lee, A. Lanzara
Phys. Rev. Lett 96, 067005 (2005)
An unusual isotope effect
in a high-transition-temperature superconductor
G.-H. Gweon,
T. Sasagawa, S.Y. Zhou, J. Graf, H. Takagi, D.-H. Lee, A. Lanzara
Nature 430,
187-190 (2004)
Strong Influence of Phonons on the
Electron Dynamics of Bi2Sr2CaCu2O8+d
G.-H.
Gweon,
S.Y. Zhou, A. Lanzara
J
Phys Chem Solids 65, 1397-1401 (2004)
Universal
Nodal
Fermi Velocity in High Temperature Superconductors
X.
J. Zhou,
T. Yoshida, A. Lanzara, P. V.
Bogdanov, S. A. Kellar, K. M. Shen, W. L. Yang, F. Ronning,
T. Sasagawa, T. Kakeshita, T. Noda, H. Eisaki, S. Uchida, C. T. Lin, F.
Zhou,
J. W. Xiong, W. X. Di,
Z.
X. Zhao, A. Fujimori, Z. Hussain, Z. X. Shen.
Nature 423,
398 (2003)
Role of
electron-phonon interaction in the strongly correlated cuprate
superconductors
Z. X. Shen, A. Lanzara, S. Ishihara, N. Nagaosa.
Phil. Mag. B 82, 1349-1368 (2002)
Evidence
for Ubiquitous Electron-Phonon Coupling in High Temperature
Superconductors.
A.Lanzara,
P. V. Bogdanov, X. J. Zhou, S. A. Kellar, D. L. Feng, E. D. Lu, T.
Yoshida, H.
Eisaki, A. Fujimori, K. Kishio, J. -I. Shimoyama,
T. Noda, S. Uchida, Z. Hussain and Z. X.
Shen
Nature 412,
510-514 (2001)
Crossover
from large to
small polarons across the metal-insulator transition in manganites
A. Lanzara,
N. L. Saini, M. Brunelli, A. Bianconi.
Phys. Rev.
Lett. 81, 878 (1998)
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