Electron-hole pair

Electron-hole pair - Factbites
Where results make sense
About us | Why use us? | Reviews | PR | Contact us

Topic: Electron-hole pair

Note: these results are not from the primary (high quality) database.

In the News (Wed 23 Dec 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Statistical Properties of Collective Hole-Pair States in Superconducting Ceramics and the Bose-Einstein Condensation.
		It is shown that in site representation the hole-pair operators obey the same commutation relations (paulionic) as the Cooper electron-pair operators in impulse representation, although the latter describe delocalized quasiparticles.
		Even in the absence of dynamic interaction, the system of hole pairs is characterized by the so called kinematic interaction.
		In quasi-impulse representation the hole-pair operators are also delocalized but the exact commutation relation correspond to a modified parafermi statistics of rank M [1] (M is the number of sites in a "superlattice" formed by the centers of mass of each hole pair.
	flux.aps.org /meetings/YR01/MAR01/abs/S2780014.html (210 words)

	Creation of Electron-Hole Pairs
		After the electron- hole pair is created, the positive charge carrier will be swept towards the n-type region by the electric field, and the negative charge carrier will be swept towards the p-type region by the electric field.
		This process is known as the creation of an electron-hole pair.
		Luckily, the operation of the device only requires the knowledge of what factors influence the creation of the electron-hole pairs and how to interpret the produced current.
	www.phy.duke.edu /courses/217/MottScatteringReport/node30.html (281 words)

	Hole superconductivity
		The reason for the increased mobility of holes upon pairing is that they 'undress' when they pair, and turn into electrons.
		A 'hole' is the absence of an electron, and hole carriers exist when an electronic energy band is almost full.
		The different mobility of holes and electrons can be illustrated by a garage analogy.
	physics.ucsd.edu /~jorge/hole.html (1462 words)

	Jakyoung song :: Electron-hole pair processes via semiempirical methodology.
		The coupling of the electron and hole states with phonons is calculated as a force contribution of the electron-hole pair to the ion, and a molecular dynamics simulation is performed by using this.
		We study the formation, binding, and nonradiative decay processes of electron-hole pairs in covalent and ionic systems.
		Moreover, a time-dependent propagation method is adapted to propagate the excited electron and the valence hole states in a lattice.
	www.emsl.pnl.gov /docs/wctcc98/abstracted/Jakyoung_song_abstract.html (209 words)

	Exciton
		An exciton is a bound state of an electron and a mathematically useful imaginary particle called an electron hole in an insulator (or semiconductor), or in other words, a Coulomb correlated electron/hole pair.
		The missing electron in the valence band leaves a hole behind, of opposite electric charge, to which it is attracted by the Coulomb force.
		As a result, the effect of the lattice potential can be incorporated into the effective masses of the electron and hole, and because of the lower masses and the screened Coulomb interaction, the binding energy is usually much less than a hydrogen atom, typically on the order of 0.1 eV.
	www.worldhistory.com /wiki/E/Exciton.htm (582 words)

	Light Emitting Diodes
		This implies that the electron-hole pair drops into a more stable bound state, releasing energy on the order of electron volts by emission of a photon.
		The junction in an LED is forward biased and when electrons cross the junction from the n- to the p-type material, the electron-hole recombination process produces some photons in the IR or visible in a process called electroluminescence.
		When the applied forward voltage on the diode of the LED drives the electrons and holes into the active region between the n-type and p-type material, the energy can be converted into infrared or visible photons.
	hyperphysics.phy-astr.gsu.edu /hbase/electronic/led.html (318 words)

	Electron-hole pair
		The movement of the hole occurs when a neighbouring valence electron migrates to fill the atom's hole, creating a new hole in the neighbouring atom.
		The positive charge on the atom giving up the electron is known as the "hole" and can also move.
		When sufficient energy is supplied to a valence electron in a semiconductor, it can be elevated to the conduction band, where it is free to move under the influence of applied electric fields.
	www.amersham-health.com /medcyclopaedia/Volume%20I/electron%20hole%20pair.html (95 words)

	definitions
		The generation of a boson which is equivalent in structure to the Archetype implies that one of the pair of electrons has inverted its potential gradient (became equivalent to an electron-hole) so that a time dilation field is produced.
		However, the electrons appear to follow Bose-Einstein statistics rather than Fermi-Dirac statistics so that the proper analysis of the charges in a superconduction state is that they are arranged in such a fashion that the entire state is bosonic.
		This produces a cascading effect until all the available conduction electrons are swept up into a unit field and have lost their discreteness to this super bosonic state.
	www.singtech.com /definitions.html (4778 words)

	Clefs44 Glossary page 2
		pair of carriers unlinked to an atom and therefore able to move in the entire crystal where they have appeared and one of which is negative (electron in the conduction band) and the other positive (absence of electron in the valence band)
		ranges of energy available for the electrons in the matter, linked to the periodic nature of the atomic structure in the crystal and to the wave-like nature of the electrons
		electron transfer protein with a polyhedral iron-sulphur redox centre
	www.cea.fr /gb/publications/Clefs44/an-clefs44/clefs44_gloss_2a.html (729 words)

	Physics News Update 700
		Indeed, a nearby electron and hole can behave as a sort of pair.
		When an electron is sprung from its niche in a semiconductor crystal, the hole remaining behind can itself move around and act as if it were a positively charged object.
		In light emitting diodes (LEDs) the coalescence of holes and electrons results in light emission.
	www.aip.org /pnu/2004/split/700-3.html (249 words)

	Ben Hsieh-Black Hole
		For black holes of sufficiently small mass would be possible for only one member of an electron-positron pair near the horizon to fall into the black hole, the other electron may escaping.
		Black hole is a gigantic dense body that has been exist in the universe.
		Some of the original black holes weighing less than a few thousand million metric tons might have been already evaporated, but the heavier ones may still remain.
	www.drennon.org /bcc/bh.htm (475 words)

	TRANSPORT AT THE F/S INTERFACE
		In order for a spin-up electron to enter the superconductor (for eV < Eg) it must bring with it a spin-down electron and enter as a Cooper Pair.
		A spin-up hole is "Andreev Reflected" into the ferromagnetic material.
	www.neiu.edu /~pjdolan/talk1.htm (38 words)

	DAMOCLES: Electron-phonon scattering and pair production rates in Si
		The latter process, known as "impact ionization" or "pair production", consists of an energetic electron "hitting" an electron in the valence band, exciting this electron across the band-gap (about 1.1 eV in Si at 300K), thus generating an electron-hole pair and recoiling to a lower energy state.
		By counting the pairs, and thus measuring the pair-generation-yield (called "quantum yield") as a function of gate bias (and so, of electron energy in the Si substrate), one has a direct measurement of the relative probability that an electron loses energy to phonons rather to electron-hole pairs.
		DAMOCLES: Electron-phonon scattering and pair production rates in Si Electron-phonon scattering and pair production rates in Si
	www.research.ibm.com /DAMOCLES/html_files/sirates.html (3699 words)

	Patent 5455451: Superconductized semiconductor device using penetrating Cooper pairs
		If the Cooper pair which was stable in the n layer is injected into the conduction band of the i layer with the holes injected in the valence electron band of the i layer, then the electron and hole forming the Cooper pair recombine together to relax.
		As in the preceding example, if the Cooper pair which was stable in the n layer is injected into the conduction band of the i layer with the holes injected in the valence electron band of the i layer, then the electron and hole forming the Cooper pair recombine together to relax.
		In the structure that the Cooper pair supply layer is provided on the both sides of nip junction, also, if the Cooper pair and hole Cooper pair radiate one photon to recombine, the energy of the photon is around two times the band gap Eg.
	www.freepatentsonline.com /5455451.html (3699 words)

	Probing superconductivity on the Nanoscale
		Associated with each Cooper pair is another kind of pair, formed by each electron and its accompanying hole.
		Davis and his colleagues set out to test the theory that a magnetic atom should capture the electron parts of the quasiparticles associated with Cooper pairs, leaving the hole parts to orbit rapidly in the d-wave configuration.
		The electronic states of Cooper pairs in high-Tc superconductors are markedly different from those in conventional ones: the two electrons revolve around each other much faster and farther apart, as do their associated quasiparticles.
	enews.lbl.gov /Science-Articles/Archive/probing-superconductivity.html (3699 words)

	MSN Encarta - Black Hole
		For black holes of sufficiently small mass it is possible for only one member of an electron-positron pair near the horizon to fall into the black hole, the other escaping (see X Ray: Pair Production).
		By 2000, astronomers had detected supermassive black holes in the centers of dozens of galaxies and had found that the masses of the black holes were correlated with the masses of the parent galaxies.
		Black holes are thought to form during the course of stellar evolution.
	encarta.msn.com /encnet/refpages/RefArticle.aspx?refid=761558067 (715 words)

	On evolution of the pair-electromagnetic pulse of a charged black hole
		Using hydrodynamic computer codes, we study the possible patterns of relativistic expansion of an enormous pair-electromagnetic-pulse (P.E.M. pulse); a hot, high density plasma composed of photons, electron-positron pairs and baryons deposited near a charged black hole (EMBH).
		On evolution of the pair-electromagnetic pulse of a charged black hole
		On the bases of baryon-loading and energy conservation, we study the bulk Lorentz factor of expansion of the P.E.M. pulse by both numerical and analytical methods.
	www.edpsciences.org /articles/aas/abs/1999/15/r81/r81.html (149 words)

	Re: Question about surface gravity and decay of a charged black hole
		So, the initial temperature would be 9.1x10E-9 deg K. Since electron positron pair production normally becomes important at temperatures above 10E10 deg K and is a very strong function of temperature, this black hole shouldn't make them...yet.
		I wanted to know > if a charged black hole could decompose by itself.
		Unless the high electrostatic charge can help, the black hole seems to be on a path toward a near extremal black hole with a temperature of ~0 K and M ~ Q = 10E-6 cm.
	www.lns.cornell.edu /spr/1999-08/msg0017491.html (149 words)

	Hole superconductivity
		The reason for the increased mobility of holes upon pairing is that they 'undress' when they pair, and turn into electrons.
		The different mobility of holes and electrons can be illustrated by a garage analogy.
		A 'hole' is the absence of an electron, and hole carriers exist when an electronic energy band is almost full.
	physics.ucsd.edu /~jorge/hole.html (149 words)

	definitions
		The generation of a boson which is equivalent in structure to the Archetype implies that one of the pair of electrons has inverted its potential gradient (became equivalent to an electron-hole) so that a time dilation field is produced.
		A charged particle's conjugate mate does not have to be anywhere near it but the fact that they are correlatively linked or that elementary charged particles must exist in correlated pairs implies that they do not actually exist in isolation.
		A dual toroidal structure composed of two counter-oriented toroidal magnetic surfaces could be referred to as a singularity because its sub components are cooperatively linked in spin up spin down states and because they share a common electric flux density vector.
	www.singtech.com /definitions.html (149 words)

	Sam's Laser FAQ - Items of Interest
		Light falling in the junction region generates electron-hole pairs which are separated by the field.
		For power measurements, the readout is based on a combination of the rate of change of the input voltage from the sensor and the steady state value to account for the thermal time constant of the sensor.
		These include the longitudinal and transverse mode structure (based on the physical dimensions and radius of curvature of the mirrors, and the wavelength) and available output power (based on the relative portion of the lasing medium intercepted by the beam or mode volume).
	repairfaq.ece.drexel.edu /sam/laserioi.htm (149 words)

	Nonlinear Optics
		It provides an ideal quasi-zero-dimensional system to study basic quantum mechanics processes, because the electron-hole pair population in each nanocrystal can be set to any number desired by simple adjusting the excitation intensity. Exciton (one electron-hole pair), biexciton (two electron-hole pairs) and even high order exciton excitation and recombination processes can be studied.
		Through these studies, electrode-hole pair(s) generation and decay processes in zero-dimensional system were much better understood.
		Particularly, the biexciton and high-order exciton excitation and recombination processes are still not very clear yet, In addition, theoretically, a huge third-order nonlinearity of c
	www.eng.fsu.edu /~zheng/Nonlinear_Optics.htm (341 words)

	monograph.html
		Since single particle energy levels scale as 1/L2 and coulomb energies scale as 1/L, confinement effects should become dominant as a box shrinks, and the electron-hole pairs become uncorrelated despite the enhancement of the direct coulomb interaction as the box shrinks.
		The importance of coulomb effects is determined by the extent to which the electron and hole can correlate in forming an exciton.
		They make a hydrogen-like particle, one particle being big and positively charged(hole) and the other being small and negatively charged(electron).
	www.reed.edu /~jneria/monograph.htm (341 words)

	CHP - Photodiode and Photovoltaic Detectors
		Photovoltaic detectors contain a p-n junction, that causes the electron-hole pairs to separate to produce a voltage that can be measured.
		When a photon strikes a semiconductor, it can promote an electron from the valence band (filled orbitals) to the conduction band (unfilled orbitals) creating an electron(-) - hole(+) pair.
		The concentration of these electron-hole pairs is dependent on the amount of light striking the semiconductor, making the semiconductor suitable as an optical detector.
	www.chem.vt.edu /chem-ed/optics/detector/pd.html (341 words)

	Articles - Semiconductor
		The details of the specific processes through which electron-hole pairs are created are not well known, however, it is known that the average energy needed to create an electron-hole pair at a given temperature is independent of the type and the energy of the ionizing radiation.
		This process is known as the creation of an electron-hole pair.
		These electrons which have enough energy to be in the conduction band have broken free of the covalent bonds between neighbouring atoms in the solid, and are free to move around, and hence conduct charge.
	www.zdiamond.net /articles/Semiconductor (2094 words)

	Electronic Band
		An exciton is a bound state of an electron and a mathematically useful imaginary particle called an electron hole in an insulator (or semiconductor), or in other words, a Coulomb Electronic correlation electron/hole pair.
		The missing electron in the valence band leaves a hole behind, of opposite electric charge, to which it is attracted by the Coulomb force.
		Electronic can refer to many things:*The band Electronic (band) or their self-titled debut, Electronic (album).
	www.electronicband.info (1325 words)

	ENERGY SCIENCE REPORT No. 5
		Thus the number of beta particle charge volumes that equals this cube volume is a measure of a factor N which is relevant to the inverse chance of a 'hit' as the annihilation and random position recreation of a mu-meson recycles at the standard (Compton electron) frequency associated with vacuum energy charge pair creation activity.
		Remembering then that the proton is deemed to comprise three charged components it is not unreasonable to believe that, when it stands in isolation, it comprises a heavy positive charge in close association with an electron-positron pair or a heavy negative particle closely bound between two positrons.
		Charge parity and the parity of space occupancy associated with electron-positron charge forms are less important to individual energy processes of the kind just described, though these too must be balanced on a collective less-local basis.
	www.aspden.org /reports/Es5/esr5.htm (15324 words)

	Exciton - Wikipedia, the free encyclopedia
		An exciton is a bound state of an electron and a mathematically useful imaginary particle called an electron hole in an insulator (or semiconductor), or in other words, a Coulomb correlated electron-hole pair.
		A vivid picture of exciton formation is as follows: a photon enters a semiconductor, exciting an electron from the valence band into the conduction band.
		Alternatively, an exciton may be thought of as an excited state of an atom or ion, the excitation wandering from one cell of the lattice to another.
	www.wikipedia.org /wiki/Exciton (549 words)

	DAMOCLES: Electron-phonon scattering and pair production rates in Si
		The latter process, known as "impact ionization" or "pair production", consists of an energetic electron "hitting" an electron in the valence band, exciting this electron across the band-gap (about 1.1 eV in Si at 300K), thus generating an electron-hole pair and recoiling to a lower energy state.
		Quantitative understanding of electron transport demands that we know how many collisions per unit time an electron of energy E will suffer.
		Experimentally a way was devised by E. Cartier and F.
	www.research.ibm.com /DAMOCLES/html_files/sirates.html (3699 words)

	ipedia.com: Exciton Article
		An exciton is a bound state of an electron and a hole in an insulator (or semiconductor), or in other words, a Coulomb correlated electron/hole pair.
		The wavefunction of the bound state is hydrogenic (an "exotic atom" state akin to that of a hydrogen atom).
		Alternatively, an exciton may be thought of as an excited state of an atom or ion, the excitation wandering from one cell of the lattice to another.
	www.ipedia.com /exciton.html (564 words)

Try your search on: Qwika (all wikis)

Topic: Electron-hole pair

Ads by Google

Related Topics

In the News (Wed 23 Dec 09)