scholarly journals Umklapp scattering is not necessarily resistive

2018 ◽  
Vol 98 (18) ◽  
Author(s):  
Zhiwei Ding ◽  
Jiawei Zhou ◽  
Bai Song ◽  
Mingda Li ◽  
Te-Huan Liu ◽  
...  
Keyword(s):  
Umklapp Scattering

Intensity sharing between Brillouin and Umklapp scattering in glasses

1999 ◽  
Vol 79 (11-12) ◽  
pp. 2021-2026 ◽  
Author(s):  
U. Buchenau, A. Wischnewski, M. Monken
Keyword(s):  
Umklapp Scattering

PHASE DIAGRAM OF ONE-DIMENSIONAL t–U–J MODEL WITH ANISOTROPIC ANTIFERROMAGNETIC EXCHANGE

2010 ◽  
Vol 24 (28) ◽  
pp. 2769-2783 ◽  
Author(s):  
HANQIN DING ◽  
YANSHEN WANG
Keyword(s):  
Phase Diagram ◽  
Weak Coupling ◽  
Density Wave ◽  
Spin Density Wave ◽  
Spin Excitation ◽  
Antiferromagnetic Exchange ◽  
Weak Coupling Regime ◽  
One Dimensional ◽  
Bond Charge ◽  
Umklapp Scattering

By using the bosonization approach and the weak-coupling renormalization group (RG) techniques, we study the phase diagram of one-dimensional half-filled t–U–J model parametrized by exchange anisotropy λ (0 ≤ λ ≤ 2) in the weak-coupling regime. In the case of anisotropic antiferromagnetic exchange (J > 0) and on-site repulsion (U > 0), the ground state is characterized by the spin-density-wave (SDW) and bond-charge-density-wave (BCDW) insulating phases. We identify the SDW correlation corresponding to the transverse SDW± phases with a gapless spin excitation (Δs=0) for λ < 4/3 and to the longitudinal SDWz phase with a spin gap (Δs > 0) for λ > 4/3, respectively. The charge excitation is always gapped (Δc > 0) in the whole regime, and the BCDW and SDWz phases show a long-range order. We also examine effects of the nonlocal Umklapp scattering of parallel-spin electrons, which play a role to weaken the BCDW phase and to enhance the SDW phase slightly. The results demonstrate that the properties of our model are not identical with those of the conventional t–U–J model.

Umklapp Scattering in Fermi Liquids: A Renormalisation Group Approach

1997 ◽  
Vol 11 (15) ◽  
pp. 1813-1828 ◽  
Author(s):  
Deepak Kumar ◽  
R. Rajaraman
Keyword(s):  
Renormalisation Group ◽  
Three Dimensions ◽  
Fermi Liquids ◽  
Electronic Systems ◽  
Group Approach ◽  
Liquid Theory ◽  
Group Methods ◽  
Almost All ◽  
Umklapp Scattering

The role of Umklapp scattering for electrons on a lattice is studied. Using renormalisation group methods it is shown that the effective low energy interaction involves not only forward scattering, but also non-forward Umklapp scattering. We show that the latter can happen to almost all of the electrons even when they have a filling of around one-half. The bahavior of these Umklapp couplings is studied in the loop expansion. It is shown that they remain marginal to all loop orders. The discussion is given in the context of two-dimensional lattices, but generalisation to three-dimensions is mentioned. We also briefly discuss the possible consequences of this on Fermi liquid theory and on physical properties of such electronic systems.

The effect of imposed temperature difference on thermal conductivity in armchair single-walled carbon nanotube

2015 ◽  
Vol 26 (09) ◽  
pp. 1550105 ◽  
Author(s):  
Ali Mehri ◽  
Maryam Jamaati ◽  
Moslem Moradi
Keyword(s):  
Thermal Conductivity ◽  
Carbon Nanotube ◽  
Heat Transport ◽  
Temperature Difference ◽  
Nonequilibrium Molecular Dynamics ◽  
Tube Length ◽  
Single Walled Carbon Nanotube ◽  
Single Walled Carbon ◽  
Brenner Potential ◽  
Umklapp Scattering

Thermal conductivity of carbon nanotubes depends on various factors. The simulation of heat transport in armchair single-walled carbon nanotube by direct nonequilibrium molecular dynamics (NEMD) method employing Tersoff–Brenner potential indicates that, thermal conductivity decreases with increase in temperature difference between two ends of the tube. Increasing the imposed temperature differential along the tube axis, leads to domination of Umklapp scattering and impacts the heat transport. The applied temperature difference does not influence the behavior of thermal conductivity vs. tube length, diameter and temperature, but changes its value.

scholarly journals Brillouin and Umklapp scattering in polybutadiene: Comparison of neutron and x-ray scattering

1999 ◽  
Vol 60 (3) ◽  
pp. R2464-R2467 ◽  
Author(s):  
A. P. Sokolov ◽  
U. Buchenau ◽  
D. Richter ◽  
C. Masciovecchio ◽  
F. Sette ◽  
...  
Keyword(s):  
X Ray ◽  
X Ray Scattering ◽  
Umklapp Scattering ◽  
Ray Scattering

scholarly journals T-square resistivity without Umklapp scattering in dilute metallic Bi2O2Se

2020 ◽  
Vol 11 (1) ◽  
Author(s):  
Jialu Wang ◽  
Jing Wu ◽  
Tao Wang ◽  
Zhuokai Xu ◽  
Jifeng Wu ◽  
...  
Keyword(s):  
Umklapp Scattering

scholarly journals Effects of Umklapp Scattering on Electronic States in One Dimension

1997 ◽  
Vol 66 (8) ◽  
pp. 2399-2409 ◽  
Author(s):  
Masakazu Murakami ◽  
Hidetoshi Fukuyama
Keyword(s):  
Electronic States ◽  
One Dimension ◽  
Umklapp Scattering

Substrate-mediated umklapp scattering at the incommensurate interface of a monatomic alloy layer

2019 ◽  
Vol 99 (15) ◽  
Author(s):  
Santosh Chiniwar ◽  
Angus Huang ◽  
Ting-Yu Chen ◽  
Chung-Huang Lin ◽  
Cheng-Rong Hsing ◽  
...  
Keyword(s):  
Alloy Layer ◽  
Umklapp Scattering
Sign in / Sign up

Export Citation Format

Share Document