44 results found for theory

The quantum spin Hall effect is a topological state of matter characterized by sustaining gapless chiral edge states together with an insulating bulk. This phase can be triggered out by applying strong magnetic fields in a graphene sample

Recently the Higgs particle has been discovered at CERN. This particle was theoretically predicted. The historical development of field theory, leading to this prediction will be discussed.

Maxwell's electromagnetic theory (now 150 years old) seemed in its comprehensive way to be capable of answering all of the questions one might ever pose about the theory of light. But that spell was broken in 1900 by Planck's discovery that light bea....

In the beginning of the 60s, the laws of classical general relativity, Einstein's generalisation of Newtonian gravity, and of quantum electrodynamics, the quantum version of Maxwell's electromagnetic theory, were known. These laws describe long range....

What do six brides have to do with Density-Functional Theory? Discover it in this lecture, in which the essential ideas behind DFT are explained in three different non-technical ways. After this practical lecture, you will be able to understand the m....

They're awesome to have in the kitchen, but did you ever wonder how your microwave actually works? This is a quick introduction to the theory that makes our home microwave ovens possible. Here, Daniel covers the differences between microwave heati....

Light quanta are the fundamental units of radiant energy. When propagating freely they travel at the fastest attainable speed and live forever. These properties recommend them as the ideal messengers for communication of all sorts. Ordinary light ....

Particle physics mainly developed after World War II. It has its roots in the first half of the previous century, when it became clear that all matter is made up from atoms, and the atoms in turn were found to contain a nucleus surrounded by electro....

The image of light waves as oscillating electromagnetic fields explains virtually all the phenomena of traditional optics.  An awareness that these waves are somehow subdivided into quanta has however been with us since the early 20th century.  The....

Particle physics mainly developed after World War II. It has its roots in the first half of the previous century, when it became clear that all matter is made up from atoms, and the atoms in turn were found to contain a nucleus surrounded by electro....

In 1935, Erwin Schrödinger, one of the inventors of quantum mechanics, illustrated his discomfort with the theory by pointing out that its extension to the macroscopic world could lead to bizarre situations such as a cat being simultaneously alive a....

The founders of quantum theory assumed in 'thought experiments' that they were manipulating isolated quantum systems, obeying the counterintuitive laws which they had just discovered.  Technological advances have recently turned these virtual experi....