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2. Empty lattice approximation - Wikipedia

   en.wikipedia.org/wiki/Empty_lattice_approximation

   The dispersion relations show conics of the free-electron energy dispersion parabolas for all possible reciprocal lattice vectors. This results in a very complicated set intersecting of curves when the dispersion relations are calculated because there is a large number of possible angles between evaluation trajectories, first and higher order ...

3. List of quasiparticles - Wikipedia

   en.wikipedia.org/wiki/List_of_quasiparticles

   A quasiparticle produced as a result of electron spin–charge separation that can form both quantum spin liquid and strongly correlated quantum spin liquid: Trion: A coherent excitation of three quasiparticles (two holes and one electron or two electrons and one hole) Triplon A quasiparticle formed from electrons with triplet state pairing [12 ...

4. Pictorial map - Wikipedia

   en.wikipedia.org/wiki/Pictorial_map

   In Medieval cartography, pictorial icons as well as religious and historical ideas usually overshadowed accurate geographic proportions. A classic example of this is the T and O map, which represented the three known continents in the form of a cross, with Jerusalem at its center. The more precise art of illustrating detailed bird's-eye-view ...

5. Glossary of geography terms (A–M) - Wikipedia

   en.wikipedia.org/wiki/Glossary_of_geography_terms...

   Also amphidrome and tidal node. A geographical location where there is little or no tide, i.e. where the tidal amplitude is zero or nearly zero because the height of sea level does not differ significantly at high tide and low tide, and around which a tidal crest circulates once per tidal period (approximately every 12 hours). The tidal amplitude increases, though not uniformly, with distance ...

6. Electron - Wikipedia

   en.wikipedia.org/wiki/Electron

   An example is the muon, with a mean lifetime of 2.2 × 10 −6 seconds, which decays into an electron, a muon neutrino and an electron antineutrino. The electron, on the other hand, is thought to be stable on theoretical grounds: the electron is the least massive particle with non-zero electric charge, so its decay would violate charge ...

7. Five themes of geography - Wikipedia

   en.wikipedia.org/wiki/Five_themes_of_geography

   Most American geography and social studies classrooms have adopted the five themes in teaching practices, [3] as they provide "an alternative to the detrimental, but unfortunately persistent, habit of teaching geography through rote memorization". [1] They are pedagogical themes that guide how geographic content should be taught in schools. [4]

8. AOL Mail is free and helps keep you safe.

   mail.aol.com/?rp=webmail-std/en-us/basic

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

9. Spin–charge separation - Wikipedia

   en.wikipedia.org/wiki/Spin–charge_separation

   It is an example of fractionalization, the phenomenon in which the quantum numbers of the quasiparticles are not multiples of those of the elementary particles, but fractions. [citation needed] The same theoretical ideas have been applied in the framework of ultracold atoms. In a two-component Bose gas in 1D, strong interactions can produce a ...