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  2. Particle in a one-dimensional lattice - Wikipedia

    en.wikipedia.org/wiki/Particle_in_a_one...

    In quantum mechanics, the particle in a one-dimensional lattice is a problem that occurs in the model of a periodic crystal lattice.The potential is caused by ions in the periodic structure of the crystal creating an electromagnetic field so electrons are subject to a regular potential inside the lattice.

  3. Transfer-matrix method (statistical mechanics) - Wikipedia

    en.wikipedia.org/wiki/Transfer-matrix_method...

    Transfer-matrix methods have been critical for many exact solutions of problems in statistical mechanics, including the Zimm–Bragg and Lifson–Roig models of the helix-coil transition, transfer matrix models for protein-DNA binding, as well as the famous exact solution of the two-dimensional Ising model by Lars Onsager.

  4. Lattice density functional theory - Wikipedia

    en.wikipedia.org/wiki/Lattice_Density_Functional...

    In 1925, Ising [2] gave an exact solution to the one-dimensional (1D) lattice problem. In 1944 Onsager [3] was able to get an exact solution to a two-dimensional (2D) lattice problem at the critical density. However, to date, no three-dimensional (3D) problem has had a solution that is both complete and exact. [4]

  5. Lattice problem - Wikipedia

    en.wikipedia.org/wiki/Lattice_problem

    In computer science, lattice problems are a class of optimization problems related to mathematical objects called lattices.The conjectured intractability of such problems is central to the construction of secure lattice-based cryptosystems: lattice problems are an example of NP-hard problems which have been shown to be average-case hard, providing a test case for the security of cryptographic ...

  6. Peierls transition - Wikipedia

    en.wikipedia.org/wiki/Peierls_transition

    Gold deposited on a stepped Si(553) surface has shown evidence of two simultaneous Peierls transitions. The lattice period is distorted by factors of 2 and 3, and energy gaps open for nearly 1/2-filled and 1/3–1/4 filled bands. The distortions have been studied and imaged using LEED and STM, while the energy bands were studied with ARP. [9]

  7. Spin chain - Wikipedia

    en.wikipedia.org/wiki/Spin_chain

    The lattice is described by a graph with vertex set and edge set .. The model has an associated Lie algebra:= (,).More generally, this Lie algebra can be taken to be any complex, finite-dimensional semi-simple Lie algebra.

  8. Hierarchy problem - Wikipedia

    en.wikipedia.org/wiki/Hierarchy_problem

    In theoretical physics, the hierarchy problem is the problem concerning the large discrepancy between aspects of the weak force and gravity. [1] There is no scientific consensus on why, for example, the weak force is 10 24 times stronger than gravity .

  9. Shortcut model - Wikipedia

    en.wikipedia.org/wiki/Shortcut_model

    The shortcut model starts with a network built on a one-dimensional regular lattice. One then adds edges to create shortcuts that join remote parts of the lattice to one another. The starting network is a one-dimensional lattice of N {\displaystyle \textstyle N} vertices with periodic boundary conditions.

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