# Category Archives: Theoretical physics

## An additional contribution to the spin Hall effect induced by an electric current

The interactions between moving charges and magnetic fields can be quite complicated; more if we consider the quantum effects. One example is the collection of Hall effects.

Imagine that we have a conductor or a semiconductor through which a current […]

## A local quantum emitter can be used to sense the environment of a molecule with the minimal quantum of energy

Plasmonic nanostructures confine light to dimensions far smaller than the free-space wavelength, as they mix optical fields with electronic excitations. It was not until the 1990s, with the appearance of accurate and reliable nanofabrication techniques, that plasmonics blossomed. It […]

## A theory of spin hall magnetoresistance to study magnetism at interfaces

The interactions between moving charges and magnetic fields can be quite complicated; more if we consider the quantum effects. One example is the collection of Hall effects.

Imagine that we have a conductor or a semiconductor through which a current […]

## Inverse-square law interaction at the nanoscale

Any physical law in which the magnitude of a physical quantity is proportional to the reciprocal of the square of the distance (1/r2) from the source of that property is known as an inverse-square law. Newton’s law […]

## The road to quantum gravity (4): The flow of time for massive objects

We started this series discussing the basic ingredients of the Universe: events, spacetime, causality. In the last chapter, we introduced massive objects (and thus, matter), which appear as a generalization of the so-called photon box.

As it moves, any […]

## A local theory of insulators

We all know what an insulator is, don’t we? An insulator is any substance that is a poor conductor of heat and electricity. Both properties ussually occur as a consequence of a lack of mobile electrons.If we want to dive […]

## The road to quantum gravity (3): The speed of light and the origin of mass

In the previous chapter of this series, we went over the subjective, relative separation of the network of events known as Spacetime into space and time. The speed of light played a major role in the discussion.

In particular, we […]

## Validity of the inhomogeneous Kibble-Zurek mechanism in the quantum domain

On 8 October 2013, following the discovery at CERN’s Large Hadron Collider of a new particle that appeared to be the long-sought Higgs boson predicted by the theory, it was announced that Peter Higgs and François Englert had been awarded […]

## An efficient tensor network algorithm for capturing thermal states of 2D quantum lattice systems

The concept of vector should be familiar: a quantity for which both magnitude and direction must be stated. This compares with a scalar quantity, where direction is not applicable, like temperature in a precise point. But, what if the magnitude […]

## Where is the mass inside a black hole?

Black holes are vacuum solutions of the Einstein equation. Hence, the energy-momentum tensor for a black hole is null at every point of space. The only place where its mass can be located is where there is no space, i.e., […]