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A superlattice is a periodic structure of layers of two (or more) materials. Typically, the thickness of one layer is several nanometers . It can also refer to a lower-dimensional structure such as an array of quantum dots or quantum wells .
The energy levels of electrons are confined in the superlattice layers. As the electrons hop between gallium arsenide quantum wells in the superlattice they emit phonons. Then, one phonon going in, produces two phonons coming out of the superlattice. This process can be stimulated by other phonons and then give rise to an acoustic amplification.
The CDW in electronic charge is accompanied by a periodic distortion – essentially a superlattice – of the atomic lattice. [1] [2] [3] The metallic crystals look like thin shiny ribbons (e.g., quasi-1-D NbSe 3 crystals) or shiny flat sheets (e.g., quasi-2-D, 1T-TaS 2 crystals). The CDW's existence was first predicted in the 1930s by Rudolf ...
In 2001, Christian Albrecht, Klaus von Klitzing, and coworkers realized an experimental setup to test Thouless et al.'s predictions about Hofstadter's butterfly with a two-dimensional electron gas in a superlattice potential.
Example of Cu-Pt type ordering in Cd-Zn-Te alloy. [1]One of the most studied atomic ordering is CuPt type ordering in III-V semiconductor alloy in chemistry and physics.It occurs in III-V alloy when the cation planes take an alternate sequence of A-rich and B-rich plane following A x B 1−x C.
A finite group is said to be supersolvable if it admits a maximal chain (or series) of subgroups so that each subgroup in the chain is normal in .A normal subgroup has been known since the 1940s to be left and (dual) right modular as an element of the lattice of subgroups. [1]
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The Bose–Hubbard model gives a description of the physics of interacting spinless bosons on a lattice.It is closely related to the Hubbard model that originated in solid-state physics as an approximate description of superconducting systems and the motion of electrons between the atoms of a crystalline solid.