|
| | | | |
| | | |
| Stat |
Members: 3645
Articles: 2'506'133
Articles rated: 2609
26 April 2024 |
|
| | | | |
|
Article overview
| |
|
|
Anisotropic density fluctuations, plasmons, and Friedel oscillations in nodal line semimetal | | Jun-Won Rhim
; Yong Baek Kim
; | | Date: |
24 Nov 2015 | | Abstract: | Motivated by recent experimental efforts on three-dimensional semimetals, we
investigate the static and dynamic density response of the nodal line semimetal
by computing the polarizability for both undoped and doped cases. The nodal
line semimetal in the absence of doping is characterized by a ring-shape zero
energy contour in momentum space, which may be considered as a collection of
Dirac points. In the doped case, the Fermi surface has a torus shape and two
independent processes of the momentum transfer contribute to the singular
features of the polarizability even though we only have a single Fermi surface.
In the static limit, there exist two independent singularities in the second
derivative of the static polarizability. This results in the highly anisotropic
Friedel oscillations which show the angle-dependent algebraic power law and the
beat phenomena in the oscillatory electron density near a charged impurity.
Furthermore, the dynamical polarizability has two singular lines along
$hbaromega = gamma p$ and $hbaromega = gamma p sineta$, where $eta$ is
the angle between the external momentum $vec{p}$ and the plane where the nodal
ring lies. From the dynamical polarizability, we obtain the plasmon modes in
the doped case, which show anisotropic dispersions and angle-dependent plasma
frequencies. Qualitative differences between the low and high doping regimes
are discussed in light of future experiments. | | Source: | arXiv, 1511.7885 | | Services: | Forum | Review | PDF | Favorites | |
|
|
No review found.
Did you like this article?
Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.
browser Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
|
News, job offers and information for researchers and scientists:
| |
REGISTER