scholarly journals Artificial event horizons in Weyl semimetal heterostructures and their non-equilibrium signatures

2021 ◽  
Vol 11 (5) ◽  
Author(s):  
Christophe De Beule ◽  
Solofo Groenendijk ◽  
Tobias Meng ◽  
Thomas Schmidt
Keyword(s):  
Scattering Problem ◽  
Normal Incidence ◽  
Differential Conductance ◽  
Type I ◽  
Type Ii ◽  
White Hole ◽  
Event Horizons ◽  
Weyl Semimetal ◽  
Low Energies ◽  
Non Equilibrium

We investigate transport in type-I/type-II Weyl semimetal heterostructures that realize effective black- or white-hole event horizons. We provide an exact solution to the scattering problem at normal incidence and low energies, both for a sharp and a slowly-varying Weyl cone tilt profile. In the latter case, we find two channels with transmission amplitudes analog to those of Hawking radiation. Whereas the Hawking-like signatures of these two channels cancel in equilibrium, we demonstrate that one can favor the contribution of either channel using a non-equilibrium state, either by irradiating the type-II region or by coupling it to a magnetic lead. This in turn gives rise to a peak in the two-terminal differential conductance which can serve as an experimental indicator of the artificial event horizon.

scholarly journals Ternary compound HfCuP: An excellent Weyl semimetal with the coexistence of type-I and type-II Weyl nodes

2020 ◽  
Vol 24 ◽  
pp. 523-528 ◽  
Author(s):  
Weizhen Meng ◽  
Xiaoming Zhang ◽  
Tingli He ◽  
Lei Jin ◽  
Xuefang Dai ◽  
...  
Keyword(s):  
Ternary Compound ◽  
Type I ◽  
Type Ii ◽  
Weyl Semimetal

Two-dimensional Weyl semimetal with coexisting fully spin-polarized type-I and type-II Weyl points

2021 ◽  
Vol 540 ◽  
pp. 148318
Author(s):  
Weizhen Meng ◽  
Xiaoming Zhang ◽  
Ying Liu ◽  
Liying Wang ◽  
Xuefang Dai ◽  
...  
Keyword(s):  
Type I ◽  
Type Ii ◽  
Two Dimensional ◽  
Weyl Semimetal ◽  
Spin Polarized

scholarly journals Effect of the type-I to type-II Weyl semimetal topological transition on superconductivity

2017 ◽  
Vol 95 (9) ◽  
Author(s):  
Dingping Li ◽  
Baruch Rosenstein ◽  
B. Ya. Shapiro ◽  
I. Shapiro
Keyword(s):  
Type I ◽  
Type Ii ◽  
Topological Transition ◽  
Weyl Semimetal

scholarly journals Photonic spin Hall effect on the surfaces of type-I and type-II Weyl semimetals

Nanophotonics ◽  
2020 ◽  
Vol 9 (3) ◽  
pp. 715-723 ◽  
Author(s):  
Guang Yi Jia ◽  
Zhen Xian Huang ◽  
Qiao Yun Ma ◽  
Geng Li
Keyword(s):  
Hall Effect ◽  
Chemical Potential ◽  
Research Area ◽  
Spin Hall Effect ◽  
Transverse Spin ◽  
Type I ◽  
Type Ii ◽  
Incident Wavelength ◽  
Weyl Semimetal ◽  
Variation Trends

AbstractTopological optics is an emerging research area in which various topological and geometrical ideas are being proposed to design and manipulate the behaviors of photons. Here, the photonic spin Hall effect on the surfaces of topological Weyl semimetal (WSM) films was studied. Our results show that the spin-dependent splitting (i.e. photonic spin Hall shifts) induced by the spin-orbit interaction is little sensitive to the tilt αt of Weyl nodes and the chemical potential μ in type-I WSM film. In contrast, photonic spin Hall shifts in both the in-plane and transverse directions present versatile dependent behaviors on the αt and μ in type-II WSM film. In particular, the largest in-plane and transverse spin Hall shifts appear at the tilts between −2 and −3, which are ~40 and ~10 times of the incident wavelength, respectively. Nevertheless, the largest spin Hall shifts for type-II WSM film with positive αt are only several times of incident wavelength. Moreover, the photonic spin Hall shifts also exhibit different variation trends with decreasing the chemical potential for different signs of αt in type-II WSM films. This dependence of photonic spin Hall shifts on tilt orientation in type-II WSM films has been explained by time-reversal-symmetry-breaking Hall conductivities in WSMs.

Coexistence of Type-I and Type-II Weyl Points in the Weyl-Semimetal OsC2

2018 ◽  
Vol 122 (6) ◽  
pp. 3533-3538 ◽  
Author(s):  
Minping Zhang ◽  
Zongxian Yang ◽  
Guangtao Wang
Keyword(s):  
Type I ◽  
Type Ii ◽  
Weyl Semimetal

Heat-Etching with a Bullivant Type II Simple Freeze-Cleave Device

1970 ◽  
Vol 28 ◽  
pp. 106-107 ◽  
Author(s):  
Ronald S. Weinstein ◽  
N. Scott McNutt
Keyword(s):  
New Zealand ◽  
General Hospital ◽  
Massachusetts General Hospital ◽  
Type I ◽  
Type Ii ◽  
Collaborative Effort ◽  
Temperature And Pressure ◽  
The University

The Type I simple cold block device was described by Bullivant and Ames in 1966 and represented the product of the first successful effort to simplify the equipment required to do sophisticated freeze-cleave techniques. Bullivant, Weinstein and Someda described the Type II device which is a modification of the Type I device and was developed as a collaborative effort at the Massachusetts General Hospital and the University of Auckland, New Zealand. The modifications reduced specimen contamination and provided controlled specimen warming for heat-etching of fracture faces. We have now tested the Mass. General Hospital version of the Type II device (called the “Type II-MGH device”) on a wide variety of biological specimens and have established temperature and pressure curves for routine heat-etching with the device.

Labelling of non-A, non-B hepatitis infected chimpanzee hepatocytes with nuclease-gold conjugates

1984 ◽  
Vol 42 ◽  
pp. 250-251
Author(s):  
G. D. Gagne ◽  
M. F. Miller ◽  
D. A. Peterson
Keyword(s):  
Endoplasmic Reticulum ◽  
Experimental Infection ◽  
Uranyl Acetate ◽  
Type I ◽  
Cellular Injury ◽  
Type Ii ◽  
Tubular Structures ◽  
Type Iii ◽  
Type Iv ◽  
Infected Chimpanzee

Experimental infection of chimpanzees with non-A, non-B hepatitis (NANB) or with delta agent hepatitis results in the appearance of characteristic cytoplasmic alterations in the hepatocytes. These alterations include spongelike inclusions (Type I), attached convoluted membranes (Type II), tubular structures (Type III), and microtubular aggregates (Type IV) (Fig. 1). Type I, II and III structures are, by association, believed to be derived from endoplasmic reticulum and may be morphogenetically related. Type IV structures are generally observed free in the cytoplasm but sometimes in the vicinity of type III structures. It is not known whether these structures are somehow involved in the replication and/or assembly of the putative NANB virus or whether they are simply nonspecific responses to cellular injury. When treated with uranyl acetate, type I, II and III structures stain intensely as if they might contain nucleic acids. If these structures do correspond to intermediates in the replication of a virus, one might expect them to contain DNA or RNA and the present study was undertaken to explore this possibility.

Comparative surface and ultrastructural views of methylotrophic bacteria by TEM, STEM, SE, and freeze-etch electron microscopy.

1987 ◽  
Vol 45 ◽  
pp. 792-793
Author(s):  
T.A. Fassel ◽  
M.J. Schaller ◽  
M.E. Lidstrom ◽  
C.C. Remsen
Keyword(s):  
Cytoplasmic Membrane ◽  
Structural Features ◽  
Methylotrophic Bacteria ◽  
Type I ◽  
Type Ii ◽  
Membrane Complex ◽  
Oxidation Of Methane ◽  
Methane Oxidizing Bacteria ◽  
Wall Structures ◽  
Methylomonas Albus

Methylotrophic bacteria play an Important role in the environment in the oxidation of methane and methanol. Extensive intracytoplasmic membranes (ICM) have been associated with the oxidation processes in methylotrophs and chemolithotrophic bacteria. Classification on the basis of ICM arrangement distinguishes 2 types of methylotrophs. Bundles or vesicular stacks of ICM located away from the cytoplasmic membrane and extending into the cytoplasm are present in Type I methylotrophs. In Type II methylotrophs, the ICM form pairs of peripheral membranes located parallel to the cytoplasmic membrane. Complex cell wall structures of tightly packed cup-shaped subunits have been described in strains of marine and freshwater phototrophic sulfur bacteria and several strains of methane oxidizing bacteria. We examined the ultrastructure of the methylotrophs with particular view of the ICM and surface structural features, between representatives of the Type I Methylomonas albus (BG8), and Type II Methylosinus trichosporium (OB-36).

Sign in / Sign up

Export Citation Format

Share Document