scholarly journals Electronic structure and Fermi-surface topology ofNaxCoO2

2007 ◽  
Vol 75 (17) ◽  
Author(s):  
A. Bourgeois ◽  
A. A. Aligia ◽  
T. Kroll ◽  
M. D. Núñez-Regueiro
Keyword(s):  
Electronic Structure ◽  
Fermi Surface ◽  
Surface Topology ◽  
Fermi Surface Topology

Electronic structure, Fermi surface topology and spectroscopic optical properties of LaBaCo2O5.5 compound

2014 ◽  
Vol 363 ◽  
pp. 133-139 ◽  
Author(s):  
A.H. Reshak ◽  
Y. Al-Douri ◽  
R. Khenata ◽  
Wilayat Khan ◽  
Saleem Ayaz Khan ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Fermi Surface ◽  
Surface Topology ◽  
Fermi Surface Topology

scholarly journals Global perspectives of the bulk electronic structure of URu2Si2 from angle-resolved photoemission

2021 ◽  
Author(s):  
Jonathan D Denlinger ◽  
J Kang ◽  
Lenart Dudy ◽  
J W Allen ◽  
Kyoo Kim ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Electronic Structure ◽  
Fermi Surface ◽  
Density Functional ◽  
High Energy ◽  
Surface Topology ◽  
High Symmetry ◽  
Functional Theory ◽  
X Ray ◽  
Fermi Surface Topology

Abstract Previous high-resolution angle-resolved photoemission (ARPES) studies of URu2Si2 have characterized the temperature-dependent behavior of narrow-band states close to the Fermi level (E F) at low photon energies near the zone center, with an emphasis on electronic reconstruction due to Brillouin zone folding. A substantial challenge to a proper description is that these states interact with other hole-band states that are generally absent from bulk-sensitive soft x-ray ARPES measurements. Here we provide a more global k-space context for the presence of such states and their relation to the bulk Fermi surface topology using synchrotron-based wide-angle and photon energy-dependent ARPES mapping of the electronic structure using photon energies intermediate between the low-energy regime and the high-energy soft x-ray regime. Small-spot spatial dependence, f-resonant photoemission, Si 2p core-levels, x-ray polarization, surface-dosing modification, and theoretical surface slab calculations are employed to assist identification of bulk versus surface state character of the E F-crossing bands and their relation to specific U- or Si-terminations of the cleaved surface. The bulk Fermi surface topology is critically compared to density functional theory and to dynamical mean field theory calculations. In addition to clarifying some aspects of the previously measured high symmetry Γ, Z and X points, incommensurate 0.6a* nested Fermi-edge states located along Z-N-Z are found to be distinctly different from the density functional theory Fermi surface prediction. The temperature evolution of these states above THO, combined with a more detailed theoretical investigation of this region, suggests a key role of the N-point in the hidden order transition.

scholarly journals Fermi-surface topology and low-lying electronic structure of the iron-based superconductor Ca10(Pt3As8)(Fe2As2)5

2012 ◽  
Vol 85 (9) ◽  
Author(s):  
Madhab Neupane ◽  
Chang Liu ◽  
Su-Yang Xu ◽  
Yung-Jui Wang ◽  
Ni Ni ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Fermi Surface ◽  
Surface Topology ◽  
Fermi Surface Topology ◽  
Iron Based

scholarly journals Ultrafast dynamical Lifshitz transition

2021 ◽  
Vol 7 (17) ◽  
pp. eabd9275
Author(s):  
Samuel Beaulieu ◽  
Shuo Dong ◽  
Nicolas Tancogne-Dejean ◽  
Maciej Dendzik ◽  
Tommaso Pincelli ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Colossal Magnetoresistance ◽  
Surface Topology ◽  
Strongly Correlated ◽  
Many Body ◽  
Time Resolved ◽  
Weyl Semimetal ◽  
Lifshitz Transition ◽  
Fermi Surface Topology ◽  
Many Body Systems

Fermi surface is at the heart of our understanding of metals and strongly correlated many-body systems. An abrupt change in the Fermi surface topology, also called Lifshitz transition, can lead to the emergence of fascinating phenomena like colossal magnetoresistance and superconductivity. While Lifshitz transitions have been demonstrated for a broad range of materials by equilibrium tuning of macroscopic parameters such as strain, doping, pressure, and temperature, a nonequilibrium dynamical route toward ultrafast modification of the Fermi surface topology has not been experimentally demonstrated. Combining time-resolved multidimensional photoemission spectroscopy with state-of-the-art TDDFT+U simulations, we introduce a scheme for driving an ultrafast Lifshitz transition in the correlated type-II Weyl semimetal Td-MoTe2. We demonstrate that this nonequilibrium topological electronic transition finds its microscopic origin in the dynamical modification of the effective electronic correlations. These results shed light on a previously unexplored ultrafast scheme for controlling the Fermi surface topology in correlated quantum materials.

Pressure-induced change of the Fermi surface topology in Al-based solid solutions

2003 ◽  
Vol 45 (12) ◽  
pp. 2213-2217 ◽  
Author(s):  
A. S. Mikhailushkin ◽  
É. I. Isaev ◽  
Yu. Kh. Vekilov ◽  
S. I. Simak
Keyword(s):  
Fermi Surface ◽  
Solid Solutions ◽  
Surface Topology ◽  
Fermi Surface Topology

scholarly journals Fermi surface topology and large magnetoresistance in the topological semimetal candidate PrBi

2019 ◽  
Vol 99 (24) ◽  
Author(s):  
Amit Vashist ◽  
R. K. Gopal ◽  
Divya Srivastava ◽  
M. Karppinen ◽  
Yogesh Singh
Keyword(s):  
Fermi Surface ◽  
Surface Topology ◽  
Topological Semimetal ◽  
Fermi Surface Topology

scholarly journals Transport signatures of Fermi surface topology change in BiTeI

2015 ◽  
Vol 91 (20) ◽  
Author(s):  
Linda Ye ◽  
Joseph G. Checkelsky ◽  
Fumitaka Kagawa ◽  
Yoshinori Tokura
Keyword(s):  
Fermi Surface ◽  
Surface Topology ◽  
Topology Change ◽  
Fermi Surface Topology
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