scholarly journals Dual topological nodal line and nonsymmorphic Dirac semimetal in three dimensions

2019 ◽  
Vol 99 (20) ◽  
Author(s):  
Yun-Tak Oh ◽  
Hong-Guk Min ◽  
Youngkuk Kim
Keyword(s):  
Nodal Line ◽  
Three Dimensions ◽  
Dirac Semimetal

Topological Type-II Nodal Line Semimetal and Dirac Semimetal State in Stable Kagome Compound Mg3Bi2

2017 ◽  
Vol 8 (19) ◽  
pp. 4814-4819 ◽  
Author(s):  
Xiaoming Zhang ◽  
Lei Jin ◽  
Xuefang Dai ◽  
Guodong Liu
Keyword(s):  
Topological Type ◽  
Nodal Line ◽  
Type Ii ◽  
Dirac Semimetal

scholarly journals Dirac Semimetal in Three Dimensions

2012 ◽  
Vol 108 (14) ◽  
Author(s):  
S. M. Young ◽  
S. Zaheer ◽  
J. C. Y. Teo ◽  
C. L. Kane ◽  
E. J. Mele ◽  
...  
Keyword(s):  
Three Dimensions ◽  
Dirac Semimetal

scholarly journals Highly anisotropic interlayer magnetoresitance in ZrSiS nodal-line Dirac semimetal

2019 ◽  
Vol 100 (8) ◽  
Author(s):  
M. Novak ◽  
S. N. Zhang ◽  
F. Orbanić ◽  
N. Biliškov ◽  
G. Eguchi ◽  
...  
Keyword(s):  
Nodal Line ◽  
Dirac Semimetal

scholarly journals Quantum oscillations of the magnetic torque in the nodal-line Dirac semimetal ZrSiS

2021 ◽  
Vol 103 (4) ◽  
Author(s):  
F. Orbanić ◽  
M. Novak ◽  
Z. Glumac ◽  
A. McCollam ◽  
L. Tang ◽  
...  
Keyword(s):  
Nodal Line ◽  
Magnetic Torque ◽  
Quantum Oscillations ◽  
Dirac Semimetal

scholarly journals Thermodynamics and transport of holographic nodal line semimetals

2021 ◽  
Vol 2021 (11) ◽  
Author(s):  
Ronnie Rodgers ◽  
Enea Mauri ◽  
Umut Gürsoy ◽  
Henk T.C. Stoof
Keyword(s):  
Lorentz Invariance ◽  
Transport Coefficients ◽  
Low Frequency ◽  
Nodal Line ◽  
Spectral Functions ◽  
Fermi Surfaces ◽  
Nodal Lines ◽  
Dirac Semimetal ◽  
Energy And Momentum ◽  
The Continuum

Abstract We study various thermodynamic and transport properties of a holographic model of a nodal line semimetal (NLSM) at finite temperature, including the quantum phase transition to a topologically trivial phase, with Dirac semimetal-like conductivity. At zero temperature, composite fermion spectral functions obtained from holography are known to exhibit multiple Fermi surfaces. Similarly, for the holographic NLSM we observe multiple nodal lines instead of just one. We show, however, that as the temperature is raised these nodal lines broaden and disappear into the continuum one by one, so there is a finite range of temperatures for which there is only a single nodal line visible in the spectrum. We compute several transport coefficients in the holographic NLSM as a function of temperature, namely the charge and thermal conductivities, and the shear viscosities. By adding a new non-linear coupling to the model we are able to control the low frequency limit of the electrical conductivity in the direction orthogonal to the plane of the nodal line, allowing us to better match the conductivity of real NLSMs. The boundary quantum field theory is anisotropic and therefore has explicitly broken Lorentz invariance, which leads to a stress tensor that is not symmetric. This has important consequences for the energy and momentum transport: the thermal conductivity at vanishing charge density is not simply fixed by a Ward identity, and there are a much larger number of independent shear viscosities than in a Lorentz-invariant system.

High-resolution scanning electron microscopy (HRSEM) of mitochondria from various rat tissues

1988 ◽  
Vol 46 ◽  
pp. 14-15
Author(s):  
P.J. Lea ◽  
M.J. Hollenberg
Keyword(s):  
Electron Microscopy ◽  
Pigment Epithelium ◽  
Retinal Pigment ◽  
Rat Hepatocytes ◽  
Three Dimensions ◽  
Objective Lens ◽  
Rat Tissues ◽  
Thin Sections ◽  
Reconstruction Methods ◽  
Scanning Electron

Our current understanding of mitochondrial ultrastructure has been derived primarily from thin sections using transmission electron microscopy (TEM). This information has been extrapolated into three dimensions by artist's impressions (1) or serial sectioning techniques in combination with computer processing (2). The resolution of serial reconstruction methods is limited by section thickness whereas artist's impressions have obvious disadvantages.In contrast, the new techniques of HRSEM used in this study (3) offer the opportunity to view simultaneously both the internal and external structure of mitochondria directly in three dimensions and in detail.The tridimensional ultrastructure of mitochondria from rat hepatocytes, retinal (retinal pigment epithelium), renal (proximal convoluted tubule) and adrenal cortex cells were studied by HRSEM. The specimens were prepared by aldehyde-osmium fixation in combination with freeze cleavage followed by partial extraction of cytosol with a weak solution of osmium tetroxide (4). The specimens were examined with a Hitachi S-570 scanning electron microscope, resolution better than 30 nm, where the secondary electron detector is located in the column directly above the specimen inserted within the objective lens.

Inelastic Electron Scattering from Valence Electrons in Aluminum

1976 ◽  
Vol 34 ◽  
pp. 462-463
Author(s):  
P. E. Batson ◽  
C. H. Chen ◽  
J. Silcox
Keyword(s):  
Electron Scattering ◽  
Single Scattering ◽  
Three Dimensions ◽  
Inelastic Electron ◽  
Weak Beam ◽  
Scattering Spectrum ◽  
Valence Electrons ◽  
Diffraction Patterns ◽  
Electronic Scattering

We wish to report in this paper measurements of the inelastic scattering component due to the collective excitations (plasmons) and single particlehole excitations of the valence electrons in Al. Such scattering contributes to the diffuse electronic scattering seen in electron diffraction patterns and has recently been considered of significance in weak-beam images (see Gai and Howie) . A major problem in the determination of such scattering is the proper correction for multiple scattering. We outline here a procedure which we believe suitably deals with such problems and report the observed single scattering spectrum.In principle, one can use the procedure of Misell and Jones—suitably generalized to three dimensions (qx, qy and #x2206;E)--to derive single scattering profiles. However, such a computation becomes prohibitively large if applied in a brute force fashion since the quasi-elastic scattering (and associated multiple electronic scattering) extends to much larger angles than the multiple electronic scattering on its own.

Advantages of Complementary Stereo Images as Viewed with the Low-Temperature Field-Emission SEM

1992 ◽  
Vol 50 (2) ◽  
pp. 1314-1315
Author(s):  
William P. Wergin ◽  
Eric F. Erbe
Keyword(s):  
Fold Increase ◽  
Horizontal Displacement ◽  
Three Dimensions ◽  
Stereo Image ◽  
Stereo Pair ◽  
Sem Micrograph ◽  
Left And Right ◽  
The Common ◽  
The Brain ◽  
Pair Analysis

The eye-brain complex allows those of us with normal vision to perceive and evaluate our surroundings in three-dimensions (3-D). The principle factor that makes this possible is parallax - the horizontal displacement of objects that results from the independent views that the left and right eyes detect and simultaneously transmit to the brain for superimposition. The common SEM micrograph is a 2-D representation of a 3-D specimen. Depriving the brain of the 3-D view can lead to erroneous conclusions about the relative sizes, positions and convergence of structures within a specimen. In addition, Walter has suggested that the stereo image contains information equivalent to a two-fold increase in magnification over that found in a 2-D image. Because of these factors, stereo pair analysis should be routinely employed when studying specimens.Imaging complementary faces of a fractured specimen is a second method by which the topography of a specimen can be more accurately evaluated.

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