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Topic: Energy band

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	Electronic band structure - Wikipedia, the free encyclopedia
		The uppermost occupied band in an insulator or semiconductor is called the valence band by analogy to the valence electrons of individual atoms.
		Because one of the main mechanisms for electrons to be excited to the conduction band is due to thermal energy, the conductivity of semiconductors is strongly dependent on the temperature of the material.
		This band gap is one of the most useful aspects of the band structure, as it strongly influences the electrical and optical properties of the material.
	en.wikipedia.org /wiki/Band_theory (1390 words)

	Band Theory for Solids
		Instead of having discrete energies as in the case of free atoms, the available energy states form bands.
		In insulators the electrons in the valence band are separated by a large gap from the conduction band, in conductors like metals the valence band overlaps the conduction band, and in semiconductors there is a small enough gap between the valence and conduction bands that thermal or other excitations can bridge the gap.
		Most solid substances are insulators, and in terms of the band theory of solids this implies that there is a large forbidden gap between the energies of the valence electrons and the energy at which the electrons can move freely through the material (the conduction band).
	hyperphysics.phy-astr.gsu.edu /hbase/solids/band.html (623 words)

	Energy bands
		The energy is plotted as a function of the wavenumber, k, along the main crystallographic directions in the crystal, since the band diagram depends on the direction in the crystal.
		An important feature of an energy band diagram, which is not included on the simplified diagram, is whether the conduction band minimum and the valence band maximum occur at the same value for the wavenumber.
		The energy bandgap of semiconductors tends to decrease as the temperature is increased.
	ece-www.colorado.edu /~bart/ecen3320/newbook/chapter2/ch2_3.htm (2408 words)

	Energy band formation (Site not responding. Last check: 2007-10-31)
		The band structure is directly related to the crystal structure of the material.
		The band structure is in general divided into several bands, band 1, band 2, band 3 and so on.
		The inclusion of band structure in Monte Carlo simulations is discussed in Shichijo and Hess.
	www.mtmi.vu.lt /pfk/funkc_dariniai/quant_mech/bands.htm (1339 words)

	[No title]
		The lowest energy of CB is called the conduction band edge, denoted as Ec, and is equal to the top of energy gap; and the highest energy of VB is called the valence band egde, denoted as Ev, and is equal to the bottom of energy gap.
		This, in the energy band terms, means that a valence electron (in VB, localized and not mobile) is thermally excited into the CB (where the electron is mobile), leaving behind an unoccupied state in the valence band.
		Charge Carriers in Energy Bands of Extrinsic Semiconductor – The relative concentration of electrons and holes in a semiconductor is controlled by the kind and concentration of chemical impurity atoms that are intentionally introduced (or doped) into the material during or after the crystal growth.
	jas.eng.buffalo.edu /education/semicon/fermi/bandAndLevel/intro.html (814 words)

	Broad frequency band energy scavenger patent invention (Site not responding. Last check: 2007-10-31)
		Energy scavengers produce electrical energy as long as they are in an environment with vibrations, such as buildings, transportation systems, industrial equipment, or other vibration generating environment.
		Input mechanical energy is received along at least one range of motion, causing a mass to oscillate in the at least one mode of oscillation.
		A portion of kinetic energy of the oscillations of the mass in the at least one mode of oscillation is converted into oscillations of the mass in a second, different mode of oscillation, causing the mass to simultaneously oscillate in two separate modes of oscillation.
	www.freshpatents.com /Broad-frequency-band-energy-scavenger-dt20050623ptan20050134148.php (1334 words)

	A New Gap-Opening Mechanism in a Triple-Band Metal
		The measured energy bands of indium atomic wires in the metallic state (left) and in the insulating state at 45 K (right).
		Bands are indicated by bright regions of higher photoemission intensity.
		The team found that in the insulating state below 125 K, the expected band-gap opening of the half-filled band was accompanied by a restructuring in which the band with the smallest filling disappeared, owing to an interband interaction in which the electrons of the disappearing band transferred into the third band, which became half filled.
	www-als.lbl.gov /als/science/sci_archive/93indium.html (995 words)

	2.2.3 Energy bands
		Energy bands occur in solids where the discreet energy levels of the individual atoms merge into bands which contain a large number of closely spaced energy levels.
		Empty bands do not contain electrons and therefore are not expected to contribute to the electrical conductivity of the material.
		We will call the almost full band the valence band since it is occupied by valence electrons and the almost empty band will be called the conduction band as electrons are free to move in this band and contribute to the conduction of the material.
	ece-www.colorado.edu /~bart/book/eband3.htm (1146 words)

	energy band (Site not responding. Last check: 2007-10-31)
		(Note that the energy bands are a property of the solid as a whole, not of the individual atoms within the solid.) [P11.4]
		is formed: from an energy level for the electrons in individual atoms, which becomes split and broadened by the influence of other nearby atoms in the solid.
		is usually separated: from other bands, just as the individual electron energy level from which it is derived is separated from other energy levels (though it is also possible for different bands to overlap).
	www.rdg.ac.uk /physicsnet/units/flap/glossary/EE/ENRGBAND.HTM (110 words)

	Energy Drink Review
		They give you a bit of energy, but there is a bunch of better ways to get some energy, two chews is about the same as 1/3 a cup of coffee...
		It doesn't give you quite the energy that other drinks do, and it doesn't kick in as quickly but this is an interesting drink targeting a bit of a different audience than many of the energy drinks out there.
		OK this isn't a energy drink, but when i seem something claiming to be in the energy market I have to give it a shot.
	www.bandddesigns.com /energy (3999 words)

	Tensen Physics Dictionary (B)
		Electrons in the conduction band are loosely bound to the atoms and can generally be thought of as bound to the material rather than to an atom.
		The energy levels tend to adjust into separated groups of energy levels called "energy bands." This is not inherently a spacial separation; rather it is a difference in the energy values which are available to the electrons.
		It was first mathematically modeled by Planck with the claim that the energy in the absorbed light was quantized.
	www.mcm.edu /~christej/dictionary/dictB.html (556 words)

	Band gap energy measurements for silicon and germanium diodes
		Majority carriers consist of electrons (in the conduction band) that travel from the n to the p side and holes (vacancies in the valence band) that travel from the p to the n side.
		The band gap energies were found to be 1.14 eV and 0.77 eV.
		First, the energy (electrical or thermal) needed to transfer an electron from the valence band to the conducting band for the silicon diode is approximately twice that of the germanium diode.
	webphysics.davidson.edu /alumni/jocowan/exp1doc.htm (1057 words)

	Britney Spears guide to Semiconductor Physics: Glossary of Terms
		The energy released by a recombining electron is immediately absorbed by another electron which then dissipates the energy by emitting phonons.
		Electron Affinity - The energy require to move an electron from the bottom of the conduction band to the energy level of an electron at rest in vacuum outside the solid.
		Impurity Band - an energy level, associated with the energy of a set of impurities in a solid, that is not part of the normal band scheme.
	britneyspears.ac /physics/lipgloss/gloss.htm (3879 words)

	Dave Nichols: Maximum energy traveltimes calculated in the seismic frequency band Maximum energy traveltimes
		The method estimates a traveltime that is valid in the seismic frequency band, not the usual high frequency approximation.
		A simple way of estimating a traveltime that is valid in the seismic frequency band is to compute the full wavefield and then pick the maximum energy arrival at each location.
		The estimate made in the seismic frequency band is much smoother and it does not show any of the instability associated with caustics that can cause problems when using ray traced Green's functions.
	sepwww.stanford.edu /public/docs/sep80/dave1/paper_html (2496 words)

	Solar Energy Technologies Program: Bandgap Energies of Semiconductors and Light
		This level of energy, known as the "bandgap energy," is the amount of energy required to dislodge an electron from its covalent bond and allow it to become part of an electrical circuit.
		To free an electron, the energy of a photon must be at least as great as the bandgap energy.
		(An electron-volt is equal to the energy gained by an electron when it passes through a potential of 1 volt in a vacuum.) The bandgap energies of other effective PV semiconductors range from 1.0 to 1.6 eV.
	www1.eere.energy.gov /solar/bandgap_energies.html?print (381 words)

	Negative Mental Energy - Band page with free MP3 music downloads on SoundClick
		Over the course of the first two years, the band played several hundred gigs from basements to festivals and everything in between, and while its fan base continued to grow and music gained popularity, there were a number of ups and downs behind the scenes that eventually came to a head in 2002.
		But, despite the satisfaction the band felt being back on the road and receiving all of the positive feedback, they knew that there was still a hurdle they had to get over if they had any chance at making the next big step.
		Sure, the deal is what you make it, and any band that has been together as a local act for as long as we have and supported ourselves for as long as we have would be ignorant not to try and put their best foot forward.
	www.soundclick.com /bands/pageartist.cfm?bandID=154303 (1150 words)

	Downtown Blues Band: High Energy Rhythm-n-Blues from Fredericton, NB, Canada
		The Band carries forth a tradition of community music development, having enabled many local musicians to put their talents to work over the years.
		The Downtown Blues Band was an original performer at Fredericton's Harvest Jazz and Blues Festival, and they have continued to rock The House for the 14 years the Festival has been in existence.
		this Band of a dozen or so (it varies from performance to performance) has been at the Harvest Jazz and Blues Festival since Day One, sending crowds home with big smiles on their faces and sore feet from too much dancing.
	www.thedowntownbluesband.com (317 words)

	Travis Allison Band - high energy & soulful rock that is sure to please - BOOK THE BAND (Site not responding. Last check: 2007-10-31)
		Soon after its release, Travis formed a band and hit the road to support the CD around Virginia, DC, and North and South Carolina.
		Taking the music to a new level onstage, the band uses its songcraft, energy, and stage presence to reach college crowds and older audiences around the region.
		As the band continues to reach new markets, the music of the TRAVIS ALLISON BAND is becoming an increasingly important voice in the realm of contemporary music.
	www.samhillbands.com /bands/travis_allison/index.shtml (419 words)

	Weddings By Recommendation Only - The Joe Sharino Band, high energy, San Francisco Bay Area (Site not responding. Last check: 2007-10-31)
		The Joe Sharino Band is one of the most popular dance bands in the South Bay.
		Joe and his band have played for virtually every major corporation in the Bay Area, the California State House of Representatives, and at hundreds of wedding receptions.
		The band is known for high-energy dance music, their incredible vocals, and their ability to involve the audience.
	www.byreconly.com /sf_vendors/music/TheJoeSharinoBand.htm (371 words)

	Bruce Springsteen with The Seeger Sessions Band - Xcel Energy Center
		Xcel Energy Center and JAM Productions have announced that Bruce Springsteen with The Seeger Sessions Band will perform at the Theater at Xcel Energy Center on Sunday, June 11 at 7:30 p.m.
		Following the band's initial stop in New Orleans on April 30 and a series of 10 concerts in Europe, the US tour resumes with a series of 18 shows kicking off in Boston on May 27 and finishing in New Jersey on June 25.
		He played to a sold-out Xcel Energy Center with the E Street Band on September 30, 2002; with the “Vote For Change Tour” on October 5, 2004; and on May 10, 2005 in support of his solo acoustical album “Devils and Dust.”
	www.xcelenergycenter.com /events/detail.jsp?month=6&year=2006&day=11&event_id=232 (287 words)

	Help: How to interpret energy band?
		As we all known, energy band is very important to everyone who want to go longer in physics, especially in condensed matter physics.
		To be able to decipher any band structure, you first need to know AND have in front of you the crystal structure of the material, or more specifically, the reciprocal structure of the material, preferably the 1st Brillouin zone.
		However, when I want to calculate band structure of some simple material, it seems too hard and I am frustrated at the first step: how to build a unit cell of a kind of concrete material which can be used in a program, for example, Gaussian.
	www.physicsforums.com /showthread.php?p=477444 (2698 words)

	Energy Band Model
		The complex energies associated with the poles provides the location and width of the sharp features in the transmission coefficient.
		In Figure 1, single band and multi-band simulations of the I-V characteristic of a GaAs/AlAs RTD are compared with experiment.
		In Figure 3 and 4, the electron density of states arising from the single band and multi-band models are compared.
	www.utdallas.edu /~frensley/hlts/nemo/aizu/node3.html (646 words)

	The Energy Band Model - Material Classification (Site not responding. Last check: 2007-10-31)
		We can say that the width of the band gap is very large, since it requires that much energy to traverse the band gap, and draw the band diagram respectively.
		This may be because of its narrow or nonexistent band gap, the conduction band may be overlapping the valence band so they share the electrons.
		The band gap is wide enough to where current is not going through it at all times, but narrow enough to where it does not take a lot of energy to have electrons in the conduction band creating a current.
	www.ece.utep.edu /courses/ee3329/ee3329/Studyguide/ToC/Fundamentals/BDiagrams/material.html (247 words)

	The Energy Band Model - The Conduction Band (Site not responding. Last check: 2007-10-31)
		The conduction band is the upper band of allowed states.
		Electrons in the conduction band are free to move about the crystal, thus the name conduction band.
		When it loses its energy it drops back down to the valence band emitting its energy as heat, light or by transferring it to another electron.
	www.ece.utep.edu /courses/ee3329/ee3329/Studyguide/ToC/Fundamentals/BDiagrams/conduction.html (132 words)

	A Step Closer to the Optimum Solar Cell
		The band gap is the amount of energy, expressed in electron volts (eV), required to kick an electron from a semiconductor's valence band, which is chock full of electrons bound to atoms, into its empty conduction band, where electrons are free to move.
		Photons with energy lower than the band gap escape unabsorbed; photons with higher energy are absorbed, but most of their energy is wasted as heat.
		The gap to the lower of the two conduction bands was the desired 1 eV.
	www.lbl.gov /Science-Articles/Archive/sb-MSD-multibandsolar-panels.html (1725 words)

	Long Island Wedding Bands New York Wedding Band Connecticut Energy Express Entertainment New Jersey Orchestras Ceremony ...
		Energy Express is an unbeatable value as a Wedding Orchestra.
		Energy Express was built from the beginning to be one of the Long Island, New York area's top total dance party bands!
		Energy Express uses a state of the art sound system to give you the very best stereo audio sound quality available, and always at the right volume level for the comfort and entertainment of your reception, private or corporate party guests.
	www.energyexpressband.com (627 words)

	FEMP You Have the Power: Energy Projects - Band Building
		The Band Building at Travis Air Force Base, CA was designed with a dual purpose—to achieve great acoustics and energy efficiency.
		The windows, walls, and ceilings are well insulated to reduce heat transfer and lower the amount of energy required for heating and cooling.
		The HVAC systems are controlled by an energy monitoring and control system that optimizes room temperature.
	www.eere.energy.gov /femp/services/yhtp/energy_projects_detail.cfm/id=1 (108 words)

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