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**Delta potential well**— The Delta potential well is a common theoretical problem of quantum mechanics. It consists of a time independent Schrödinger equation for a particle in a potential well defined by a delta function in one dimension.DefinitionThe time independent… … Wikipedia**Variational Monte Carlo**— Variational Monte Carlo(VMC) is a quantum Monte Carlo method that applies the variational method to approximate the ground state of the system. The expectation value necessary can be written in the x representation as frac{langle Psi(a) | H |… … Wikipedia**Landau theory**— in physics was introduced by Lev Davidovich Landau in an attempt to formulate a general theory of second order phase transitions. He was motivated to suggest that the free energy of any system should obey two conditions: that the free energy is… … Wikipedia**Hückel method**— The Hückel method or Hückel molecular orbital method (HMO) proposed by Erich Hückel in 1930, is a very simple linear combination of atomic orbitals molecular orbitals (LCAO MO) method for the determination of energies of molecular orbitals of pi… … Wikipedia**Topological conjugacy**— In mathematics, two functions are said to be topologically conjugate to one another if there exists a homeomorphism that will conjugate the one into the other. Topological conjugacy is important in the study of iterated functions and more… … Wikipedia**Step potential**— The Schrödinger equation for a one dimensional step potential is a model system in quantum mechanics and scattering theory. The problem consists of solving the time independent Schrödinger equation for a particle with a step like potential in one … Wikipedia**Finite potential barrier (QM)**— In quantum mechanics, the finite potential barrier is a standard one dimensional problem that demonstrates the phenomenon of quantum tunnelling. The problem consists of solving the time independent Schrödinger equation for a particle with a… … Wikipedia**History of the harpsichord**— The harpsichord was an important keyboard instrument in Europe from the 15th through the 18th centuries, and as revived in the 20th, is widely played today. This article gives a history of the harpsichord; for information on the construction of… … Wikipedia