scholarly journals Electron dynamics in the normal state of cuprates: Spectral function, Fermi surface and ARPES data

2016 ◽  
Vol 42 (11) ◽  
pp. 1041-1056
Author(s):  
E. E. Zubov
Keyword(s):  
Fermi Surface ◽  
Spectral Function ◽  
Normal State ◽  
Electron Dynamics ◽  
Arpes Data

scholarly journals U(1)×SU(2) Gauge Theory of Underdoped Cuprate Superconductors

1998 ◽  
Vol 12 (05) ◽  
pp. 173-180 ◽  
Author(s):  
P. A. Marchetti ◽  
Zhao-Bin Su ◽  
Lu Yu
Keyword(s):  
Gauge Theory ◽  
Fermi Surface ◽  
Transport Properties ◽  
Gauge Field ◽  
Spectral Function ◽  
Normal State ◽  
Doping Concentration ◽  
Cuprate Superconductors ◽  
Low Energy ◽  
Chern Simons

The U(1)×SU(2) Chern–Simons gauge theory is applied to study the 2D t–J model describing the normal state of underdoped cuprate superconductors. The U(1) field produces a flux phase for holons converting them into Dirac-like fermions, while the SU(2) field, due to the coupling to holons gives rise to a gap for spinons. An effective low-energy action involving holons, spinons and a self-generated U(1) gauge field is derived. The Fermi surface and electron spectral function obtained are consistent with photoemission experiments. The theory predicts a minimal gap proportional to doping concentration. It also explains anomalous transport properties.

scholarly journals Unitarity bound violation in holography and the instability toward the charge density wave

2020 ◽  
Vol 35 (22) ◽  
pp. 2050128
Author(s):  
Geunho Song ◽  
Yunseok Seo ◽  
Sang-Jin Sin
Keyword(s):  
Field Theory ◽  
Conformal Field Theory ◽  
Fermi Surface ◽  
Charge Density ◽  
Spectral Function ◽  
Charge Density Wave ◽  
Density Wave ◽  
Surface Phenomena ◽  
Unitarity Bound ◽  
Conformal Field

We study the spectral function of holographic fermions with Pauli term. We find the [Formula: see text]-dependent instability signaled by the tachyonic spectrum ([Formula: see text]-gap) from the [Formula: see text] regime where unitarity is violated. We suggest that this is the instability toward the charge density wave (CDW) based on the similarity of the unitarity violation in conformal field theory (CFT) and the nesting Fermi surface phenomena in weakly interaction system: both of them give divergent enhancement of degree of freedom.

scholarly journals Positron Annihilation Studies of the Electronic Structure and Fermiology of High-Tc Superconductors

1993 ◽  
Vol 48 (1-2) ◽  
pp. 398-405 ◽  
Author(s):  
L. C. Smedskjaer ◽  
A. Bansil
Keyword(s):  
Electronic Structure ◽  
Fermi Surface ◽  
Positron Annihilation ◽  
Normal State ◽  
Theoretical Work ◽  
High Tc Superconductors ◽  
Band Theory ◽  
High Tc ◽  
Remarkable Agreement ◽  
Conventional Picture

Abstract We discuss the application of the positron annihilation angular correlation (ACAR) spectroscopy for investigating the electronic structure and Fermiology of high-Tc superconductors, with focus on the YBa2Cu3O7 system where most of the experimental and theoretical work has to date been concentrated. Detailed comparisons between the measured 2D-ACAR positron spectra and the corresponding band theory predictions show a remarkable agreement (for the normal state), indicat-ing that the electronic structure and Fermi surface of this material is described reasonably by the conventional picture.

Theory of the Normal State of Cuprate Superconductors

1989 ◽  
Vol 169 ◽  
Author(s):  
Philip W. Anderson ◽  
Yong Ren
Keyword(s):  
Fermi Surface ◽  
Normal State ◽  
Cuprate Superconductors ◽  
Metallic State ◽  
Zero Energy ◽  
Temperature Dependent ◽  
Spin Excitations ◽  
Photoemission Data ◽  
The One ◽  
Do So

AbstractWe propose a framework for the theory of the "normal" metallic state of the CuO2 planes of high Tc superconductors. This state is closely analogous to the known state of the one-dimensional Hubbard model, with spin excitations which can be thought of as chargeless (Z = 0) Fermions occupying the interior of the conventional Fermi surface, and charged excitations which have zero energy near the spanning vectors 2kF of that Fermi surface. The electron spectrum is the composite spectrum of two of these excitations, and can be fitted to angle-resolved photoemission data. When we do so we can calculate or estimate many properties of the normal state in excellent agreement with experiment, and show that the pair susceptibility is anomalously large and temperature-dependent, explaining the high Tc and the specific heat behavior.

scholarly journals The pseudogap in La2–xSrxCuO4: A Raman viewpoint

2000 ◽  
Vol 78 (5-6) ◽  
pp. 483-493 ◽  
Author(s):  
J G Naeini ◽  
J C Irwin ◽  
T Sasagawa ◽  
Y Togawa ◽  
K Kishio
Keyword(s):  
Fermi Surface ◽  
Normal State ◽  
Low Temperatures ◽  
Spectral Weight ◽  
Energy Scale ◽  
Low Energy ◽  
Scattering Rate ◽  
Low Energies ◽  
Consistent Picture ◽  
Rate Suppression

We report the results of Raman scattering experiments on single crystals of La2–xSrxCuO4 (La214) as a function of temperature and doping. In underdoped compounds low-energy B1g spectral weight is depleted in association with the opening of a pseudogap on regions of the Fermi surface located near (±π, 0) and (0, ±π).The magnitude of the depletion increases with decreasing doping, and in the most underdoped samples, with decreasing temperature.The spectral weight that is lost at low energies (ω [Formula: see text] 800 cm–1) is transferred to the higher energy region normally occupied by multimagnon scattering. From the normal-state B2g spectra we have determined the scattering rate Γ(ω,T) of qausiparticles located near the diagonal directions in k-space. In underdoped compounds, Γ(ω,T) is suppressed at low temperatures for energies less than Eg(x) [Formula: see text] 800 cm–1. The doping dependence of both the two-magnon scattering and the scattering rate suppression suggest that the pseudogap is characterized by an energy scale Eg ~ J, where J is the antiferromagnetic super-exchange energy. Comparison with the results from other techniques provides a consistent picture of the pseudogap in La214.PACS Nos.: 74.25.Gz, 74.72.Dn, 78.30.Er

High-resolution angle-resolved photoemission study of the Fermi surface and the normal-state electronic structure ofBi2Sr2CaCu2O8

1990 ◽  
Vol 42 (1) ◽  
pp. 381-386 ◽  
Author(s):  
C. G. Olson ◽  
R. Liu ◽  
D. W. Lynch ◽  
R. S. List ◽  
A. J. Arko ◽  
...  
Keyword(s):  
Electronic Structure ◽  
High Resolution ◽  
Fermi Surface ◽  
Normal State ◽  
Photoemission Study

scholarly journals Electronic structure of the candidate 2D Dirac semimetal SrMnSb2: a combined experimental and theoretical study

2018 ◽  
Vol 4 (2) ◽  
Author(s):  
Shyama Varier Ramankutty ◽  
Jans Henke ◽  
Adriaan Schiphorst ◽  
Rajah Nutakki ◽  
Stephan Bron ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Fermi Surface ◽  
Theoretical Study ◽  
Berry Phase ◽  
Tight Binding ◽  
Quantum Oscillation ◽  
Great Promise ◽  
Dirac Semimetal ◽  
Arpes Data ◽  
Good Agreement

SrMnSb_22 is suggested to be a magnetic topological semimetal. It contains square, 2D Sb planes with non-symmorphic crystal symmetries that could protect band crossings, offering the possibility of a quasi-2D, robust Dirac semi-metal in the form of a stable, bulk (3D) crystal. Here, we report a combined and comprehensive experimental and theoretical investigation of the electronic structure of SrMnSb_22, including the first ARPES data on this compound. SrMnSb_22 possesses a small Fermi surface originating from highly 2D, sharp and linearly dispersing bands (the ‘Y-states’) around the (0,/a)-point in kk-space. The ARPES Fermi surface agrees perfectly with that from bulk-sensitive Shubnikov de Haas data from the same crystals, proving the Y-states to be responsible for electrical conductivity in SrMnSb_22. DFT and tight binding (TB) methods are used to model the electronic states, and both show good agreement with the ARPES data. Despite the great promise of the latter, both theory approaches show the Y-states to be gapped above E_FF, suggesting trivial topology. Subsequent analysis within both theory approaches shows the Berry phase to be zero, indicating the non-topological character of the transport in SrMnSb_22, a conclusion backed up by the analysis of the quantum oscillation data from our crystals.

scholarly journals Fermi surface of the heavy-fermion superconductorCeCoIn5:The de Haas–van Alphen effect in the normal state

2001 ◽  
Vol 64 (21) ◽  
Author(s):  
Donavan Hall ◽  
E. C. Palm ◽  
T. P. Murphy ◽  
S. W. Tozer ◽  
Z. Fisk ◽  
...  
Keyword(s):  
Fermi Surface ◽  
Normal State ◽  
Heavy Fermion
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