Spectral-weight transfer: Breakdown of low-energy-scale sum rules in correlated systems

1993 ◽  
Vol 48 (6) ◽  
pp. 3916-3926 ◽  
Author(s):  
M. B. J. Meinders ◽  
H. Eskes ◽  
G. A. Sawatzky
Keyword(s):  
Sum Rules ◽  
Spectral Weight ◽  
Energy Scale ◽  
Low Energy ◽  
Correlated Systems ◽  
Weight Transfer

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

scholarly journals Plasmons in Strongly Correlated Systems: Spectral Weight Transfer and Renormalized Dispersion

2014 ◽  
Vol 113 (24) ◽  
Author(s):  
E. G. C. P. van Loon ◽  
H. Hafermann ◽  
A. I. Lichtenstein ◽  
A. N. Rubtsov ◽  
M. I. Katsnelson
Keyword(s):  
Spectral Weight ◽  
Strongly Correlated Systems ◽  
Strongly Correlated ◽  
Correlated Systems ◽  
Weight Transfer

scholarly journals Mottness collapse and T -linear resistivity in cuprate superconductors

2011 ◽  
Vol 369 (1941) ◽  
pp. 1574-1598 ◽  
Author(s):  
Philip Phillips
Keyword(s):  
Short Range ◽  
Degrees Of Freedom ◽  
Cuprate Superconductors ◽  
High Temperature Superconductors ◽  
Spectral Weight ◽  
Quantum Criticality ◽  
Low Energy ◽  
Energy Theory ◽  
Weight Transfer ◽  
Subsequent Onset

Central to the normal state of cuprate high-temperature superconductors is the collapse of the pseudo-gap, briefly reviewed here, at a critical point and the subsequent onset of the strange metal characterized by a resistivity that scales linearly with temperature. A possible clue to the resolution of this problem is the inter-relation between two facts: (i) a robust theory of T -linear resistivity resulting from quantum criticality requires an additional length scale outside the standard one-parameter scaling scenario and (ii) breaking the Landau correspondence between the Fermi gas and an interacting system with short-range repulsions requires non-fermionic degrees. We show that a low-energy theory of the Hubbard model that correctly incorporates dynamical spectral weight transfer has the extra degrees of freedom needed to describe this physics. The degrees of freedom that mix into the lower band as a result of dynamical spectral weight transfer are shown to either decouple beyond a critical doping, thereby signalling Mottness collapse, or unbind above a critical temperature, yielding strange metal behaviour characterized by T -linear resistivity.

scholarly journals Low-energy scale of the periodic Anderson model

2000 ◽  
Vol 61 (19) ◽  
pp. 12799-12809 ◽  
Author(s):  
Th. Pruschke ◽  
R. Bulla ◽  
M. Jarrell
Keyword(s):  
Anderson Model ◽  
Energy Scale ◽  
Low Energy ◽  
Periodic Anderson Model

Derivative sum rules and inconsistencies in the low-energy N scattering parameters

1969 ◽  
Vol 11 (1) ◽  
pp. 115-126 ◽  
Author(s):  
N.M. Queen ◽  
S. Leeman ◽  
F.E. Yeomans
Keyword(s):  
Sum Rules ◽  
Low Energy ◽  
Scattering Parameters

scholarly journals Low energy sum rules forπ−πscattering and threshold parameters

1996 ◽  
Vol 53 (5) ◽  
pp. 2362-2370 ◽  
Author(s):  
B. Ananthanarayan ◽  
D. Toublan ◽  
G. Wanders
Keyword(s):  
Sum Rules ◽  
Low Energy

scholarly journals ONE-ELECTRON SPECTRAL WEIGHT OF DOPED MOTT INSULATORS IN GAUGE FIELD THEORY APPROACH

1996 ◽  
Vol 10 (27) ◽  
pp. 3727-3736
Author(s):  
H.C. LEE
Keyword(s):  
Field Theory ◽  
Gauge Field ◽  
Spectral Weight ◽  
Low Energy ◽  
Vertex Correction ◽  
Gauge Field Theory ◽  
Mott Insulators ◽  
Theory Approach ◽  
Two Dimensional ◽  
Second Order Perturbation Theory

The electron spectral weight of doped Mott insulators based on the two-dimensional slave boson gauge field theory is studied. The vertex correction with static gauge field is calculated in the second order perturbation theory. The vertex correction is found to be singular at low energy and requires non-perturbative treatments.

scholarly journals Analysis of the DD¯⁎K System with QCD Sum Rules

2019 ◽  
Vol 2019 ◽  
pp. 1-6 ◽  
Author(s):  
Zun-Yan Di ◽  
Zhi-Gang Wang
Keyword(s):  
Spectral Density ◽  
Sum Rules ◽  
Resonance State ◽  
Energy Scale ◽  
Color Singlet ◽  
Qcd Sum Rules ◽  
Optimal Energy ◽  
Numerical Result ◽  
The Future ◽  
Vacuum Condensates

In this article, we construct the color singlet-singlet-singlet interpolating current with IJP=3/21- to study the DD¯⁎K system through QCD sum rules approach. In calculations, we consider the contributions of the vacuum condensates up to dimension-16 and employ the formula μ=MX/Y/Z2-2Mc2 to choose the optimal energy scale of the QCD spectral density. The numerical result MZ=4.71-0.11+0.19 GeV indicates that there exists a resonance state Z lying above the DD¯⁎K threshold to saturate the QCD sum rules. This resonance state Z may be found by focusing on the channel J/ψπK of the decay B→J/ψππK in the future.

scholarly journals EXPLICITLY BROKEN LEPTON NUMBER AT LOW ENERGY IN THE HIGGS TRIPLET MODEL

2006 ◽  
Vol 21 (12) ◽  
pp. 971-977 ◽  
Author(s):  
C. A. DE S. PIRES
Keyword(s):  
Mass Spectrum ◽  
Energy Scale ◽  
Lepton Number ◽  
Low Energy ◽  
Triplet Model ◽  
Scalar Sector ◽  
Higgs Triplet Model

We assume that lepton number is explicitly broken at low energy scale (M) in the framework of the Higgs triplet (Δ) model. The scalar sector of the model is developed considering the particular assumption M = vΔ ≈ eV . We show that such assumption infers a particular mass spectrum for the scalars that compose the triplet and cause a decoupling of these scalars from those that compose the standard scalar doublet.

Sign in / Sign up

Export Citation Format

Share Document