Search results for Dirac cones

Nanomaterials Apr 28, 2022

Beyond van der Waals: The next generation of covalent 2D-2D heterostructures

A team of scientists have "velcroed" 2D structures of MoS2 and graphene using a covalent connection for the first time. The 2D-2D structures were used to build robust field effect transistors with controlled electronic communication, ...

Nanomaterials Dec 1, 2021

Developing wafer-scale highly oriented graphene on sapphire

Researchers have used direct chemical vapor deposition (CVD) growth of wafer-scale, high-quality graphene on dielectrics for versatile applications. However, graphene synthesized this way has shown a polycrystalline film ...

Condensed Matter Nov 12, 2021

Researchers combine two semiconductor doping methods to achieve new efficiencies

A University of Wollongong-led team across three FLEET nodes has combined two traditional semiconductor doping methods to achieve new efficiencies in the topological insulator bismuth-selenide (Bi2Se3).

Optics & Photonics Oct 26, 2021

Topological valley Hall edge solitons in photonics

Diffraction is a natural property of light beams that allows light to bend around obstacles. Because light serves as a carrier of information, some of the distorting effects of diffraction must be mitigated for many technological ...

General Physics Mar 22, 2021

Scientists observe complex tunable magnetism tied to electrical conduction in a topological material

Scientists at the U.S. Department of Energy's Ames Laboratory have observed novel helical magnetic ordering in the topological compound EuIn2As2 which supports exotic electrical conduction tunable by a magnetic field. The ...

Superconductivity Mar 17, 2021

Magnetism meets topology on a superconductor's surface

Electrons in a solid occupy distinct energy bands separated by gaps. Energy band gaps are an electronic "no man's land," an energy range where no electrons are allowed. Now, scientists studying a compound containing iron, ...

Optics & Photonics Jan 15, 2021

Towards applications: ultra-low-loss on-chip zero-index materials

A refractive index of zero induces a wave vector with zero amplitude and undefined direction. Therefore, light propagating inside a zero-index medium does not accumulate any spatial phase advance, resulting in perfect spatial ...

Condensed Matter Nov 25, 2020

Ideal type-II Weyl points are observed in classical circuits

The elementary particles that build the universe have two types: bosons and fermions, where the fermions are classified as Dirac, Weyl, and Majorana fermions. In recent years, Weyl fermions are found in condensed matter systems, ...

General Physics Sep 24, 2020

Bridging the gap between the magnetic and electronic properties of topological insulators

Scientists at Tokyo Institute of Technology shed light on the relationship between the magnetic properties of topological insulators and their electronic band structure. Their experimental results offer new insights into ...

Quantum Physics Aug 17, 2020

Unexpectedly fast conduction electrons in Na3Bi

An Australian-led study uses a scanning-tunneling microscope "trick" to map electronic structure in Na3Bi, seeking an answer to that material's extremely high electron mobility.

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