Category archives: Theoretical physics

A link between straintronics and valleytronics in graphene

A link between straintronics and valleytronics in graphene

Condensed matterMaterialsNanotechnologyQuantum physicsTheoretical physics

By DIPC

So-called “valleytronics” is a new type of electronics that could lead to faster and more efficient computer logic systems and data storage chips in next-generation devices. Valley electrons are so named because they carry a valley “degree of freedom.” This is a new way to harness electrons for information processing that’s in addition to utilizing […]

How to study magnetic Weyl fermions experimentally

How to study magnetic Weyl fermions experimentally

ChemistryCondensed matterQuantum physicsTheoretical physics

By DIPC

Imagine there exist a material in which an electron could be split into two quasiparticles. These two quasiparticles both would carry electric charge, move in opposite directions but could not move backwards. Furthermore these quasiparticles would be massless. And we can give them a fancy name, Weyl fermions. This seems to be at odds with […]

The geometry of String Compactifications (III): exploring the Calabi-Yau manifold

The geometry of String Compactifications (III): exploring the Calabi-Yau manifold

PhysicsTheoretical physics

By Carlos Shahbazi

In the previous articles (I, II), we have characterized the simplest class of supersymmetric heterotic compactification backgrounds. In particular, we have finished the second article with the following result: There is a class of admissible Heterotic internal manifolds characterized as being six-dimensional, oriented, spin, Riemannian compact manifolds admitting a parallel spinor respect to the Levi-Civita […]

The geometry of String Theory compactifications (II): finding the Calabi-Yau manifold

The geometry of String Theory compactifications (II): finding the Calabi-Yau manifold

PhysicsTheoretical physics

By Carlos Shahbazi

This is the second of the series of articles on the geometry of String Theory compactifications. Before reading this note, the interested reader may want to read the first note, where the concept of compactification background is introduced in the context of String Theory and M-Theory compactifications. As it is well known, to be well-defined […]

The geometry of String Theory compactifications (I): the basics.

The geometry of String Theory compactifications (I): the basics.

PhysicsTheoretical physics

By Carlos Shahbazi

This is first of a series of notes on the geometry of String Theory compactifications. The space-time in String Theory is often described by means of a mathematical object called manifold . Manifolds are very important objects from the mathematical and the physics point of view, not only in String Theory. For example, differential geometry […]

How to measure tiny temperature differences using a Josephson junction

How to measure tiny temperature differences using a Josephson junction

Condensed matterMaterialsPhysicsQuantum physicsTheoretical physics

By DIPC

At low temperatures, the resistivity of a metal (the inverse of its conductivity) is nearly constant. As the temperature of a material is lowered and as we approach absolute zero the resistivity should approach a constant value. Many metals, known as normal metals, behave in this way. The behaviour of another class of metals and […]

Unveiling the origin of the record superconductivity

Unveiling the origin of the record superconductivity

Condensed matterMaterialsPhysicsTheoretical physics

By Ion Errea

Achieving room temperature superconductivity is among the most pursued but elusive goals of scientists. A paper uploaded to the arXiv in December 2014 claims to have observed superconductivity as high as 190 K in hydrogen sulfide at high pressure, breaking all the records thus far. If this observation is confirmed, cuprates will be knocked from […]

Supergravities

Supergravities

PhysicsTheoretical physics

By Invited Researcher

Although pretty much unknown for the public audience, Supergravity theories play an important role in modern Theoretical Physics, specially for the particle physics and (Super)String Theory communities . Loosely speaking, Supergravity is a theory that describes gravity along with other fundamental particles and interactions in such a way that the whole structure is symmetric under […]