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Topic: Fermi surface

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	Enrico Fermi's Impact on Science - John Marburger Speech
		Fermi postulated that the proton, electron and neutrino were similarly created on the spot, and wrote down a mathematical expression for the interaction that was similar to the basic interaction in quantum electrodynamics, but more complicated.
		Fermi had found cadmium to be a strong neutron absorber, and the combination of components was designed to produce neutrons with just the right energy to be captured by the uranium nuclei which subsequently break apart, or fission, creating additional neutrons to keep the reaction going.
		Fermi's work with reactors makes him the father of nuclear energy, and it is for this reason, as well as for his important contribution to the war effort, that the United States Congress gave him a special award just prior to his death in November 1954.
	www.osti.gov /accomplishments/marburger.html (3314 words)

	Fermi surface (Site not responding. Last check: 2007-10-08)
		The Fermi surface is defined as the locus of points in momentum space with zero excitation energy, that is, when the peak in the spectral function is at the chemical potentia.
		The topology of the Fermi surface is important in understanding the electronic properties of materials.
		The BiO layer on the surface of the sample is buckled, since the atoms are too large to be accomodated by the periodicity of the underlying structure.
	tigger.uic.edu /~jcc/fermi-surfaces.html (373 words)

	Fermi level and Fermi function
		In doped semiconductors, p-type and n-type, the Fermi level is shifted by the impurities, illustrated by their band gaps.
		The Fermi energy also plays an important role in understanding the mystery of why electrons do not contribute significantly to the specific heat of solids at ordinary temperatures, while they are dominant contributors to thermal conductivity and electrical conductivity.
		The Fermi function gives the probability of occupying an available energy state, but this must be factored by the number of available energy states to determine how many electrons would reach the conduction band.This density of states is the electron density of states, but there are differences in its implications for conductors and semiconductors.
	hyperphysics.phy-astr.gsu.edu /hbase/solids/fermi.html (934 words)

	Fermi surface
		It should be noted, that the change of the Fermi surface from hole-like to electron-like is closely related to the change in the sign of the Hall coefficient from positive to negative occurring for doping slightly above the optimum doping.
		The peak structure of the spectral function is characterized by yellow region in the plot and the white line marks the non-interacting Fermi surface.
		Observed Fermi surface crossings are denoted by thick error bars and the dotted curve is tentatively drawn so that the area enclosed by the Fermi surface is consistent with the Luttinger theorem.
	morje.ijs.si /~haule/thesis/html/node24.html (1469 words)

	Physics Today June 2002
		Fermi was born in Rome on 29 September 1901 and died in Chicago on 28 November 1954.
		Fermi was not particularly critical of Mussolini's fascist regime prior to the dictator's promulgation of anti-Jewish laws in 1938.
		Fermi and Teller, and independently Victor Weisskopf at MIT, gave convincing arguments that this surprisingly long survival could not be explained away in terms of some anomaly in the process of slowing down in carbon.
	www.aip.org /pt/vol-55/iss-6/p38.html (4563 words)

	3.4.2 Surface states - Fermi energy pinning
		Surface states are states caused by the incomplete covalent bonds at the surface of a semiconductor.
		These surface states cause the Fermi energy to be pinned: electrons from the valence band fall into the surface states until the Fermi energy coincides with the level to which the surface states are filled.
		This causes a natural surface depletion in gallium arsenide and a potential across the semiconductor of about 0.6 V. Contacting gallium arsenide with different metals yields a barrier height around 0.8 V independent of the workfunction of the metal.
	ece-www.colorado.edu /~bart/book/surfstat.htm (218 words)

	Research Programs at CMSS
		The accuracy with which the Fermi surface geometry can be determined in k-space is directly controlled by the energy and angular resolution of the electron spectrometer / beamline monochromator combination.
		Knowledge of the Fermi surface is of fundamental significance and is a crucial pre-requisite for understanding the electronic and magnetic properties of conducting materials and, in particular, the effect of quantum confinement effects on spin-orbit coupling and on exchange/correlation energies.
		The Fermi surface of disordered Cu3 Au as determined by angle resolved photoemission.
	www.latrobe.edu.au /surface/html/arups.htm (1447 words)

	Fermi surface - Wikipedia, the free encyclopedia
		In condensed matter physics, the Fermi surface is an abstract boundary useful for predicting the thermal, electrical, magnetic, and optical properties of metals, semimetals, and doped semiconductors.
		The shape of the Fermi surface is derived from the periodicity and symmetry of the crystalline lattice and from the occupation of electronic energy bands.
		The existence of a Fermi surface is a direct consequence of the Pauli exclusion principle, which prevents fermions from all crowding into the same state.
	en.wikipedia.org /wiki/Fermi_surface (771 words)

	XCrySDen - (X-Window) Crystalline Structure and Densities (Site not responding. Last check: 2007-10-08)
		Actually, the viewer is composed from notebook, holding the corresponding Fermi surfaces of particular bands in separate pages.
		Fermi surface viewer is composed from several pages, each holding a Fermi surface of particular band.
		Use this button when the illumination of the Fermi surface is odd.
	web.mit.edu /xcrysden_v1.0b/www/XCRYSDEN/doc/fermi.html (524 words)

	Fermi energy - Wikipedia, the free encyclopedia
		The Fermi energy is one of the central concepts of condensed matter physics.
		The Fermi momentum is the momentum of fermions at the Fermi surface.
		In either case, the Fermi energy states reside on a surface in momentum space known as the Fermi surface.
	en.wikipedia.org /wiki/Fermi_level (936 words)

	Fermi Contours of Metal Surfaces and Ultrathin Films
		Fermi contours correspond to maxima in intensity and are indicated by white lines.
		Mo(110) exhibits a Fermi contour that is insignificantly split compared to that of W(110), as expected for this lighter (though isoelectronic) metal.
		Indeed, these are bulk states that propagate to the surface, and are thus the ones that drive the SDW state.
	zebu.uoregon.edu /~kevan/fermi.html (2187 words)

	3D Fermi Surface Site
		Fermi surface of 45 elemental solids from Lithium to Thorium.
		For each element, the VRML and stereographic pictures of the Fermi surfaces are provided.
		Note: VRML Fermi surface for hcp structures are not available, but all GIF's are fine.
	www.phys.ufl.edu /~tschoy/r2d2/Fermi/Fermi.html (173 words)

	Quick and Dirty Preview of Solid State Physics
		The Fermi Energy, which is synonymous with the electron chemical potential at T=0, represents the energy level that the next electron into the system must have, to be at the lowest possible freely-available state.
		The Fermi Surface represents the 3-D distribution in reciprocal space of where the Fermi energy lies.
		Hence, the Fermi surface is a sphere of radius k
	www.pha.jhu.edu /~jeffwass/2ndYrSem/slide17.html (204 words)

	PEEM+IEF: Fermi surface of Cu(001)
		When the projection lenses are set to display the focal plane of the objective lens, the angular distribution of the emitted electrons is obtained.
		The complete three-dimensional Fermi surface can be obtained rather quickly by acquiring a series of such images for different photon energies.
		The well-known "dog-bone" shape of the Cu Fermi surface is clearly seen.
	www.omicron.de /results/peem_ief_fermi_surface_of_cu_001 (214 words)

	Physics Today January 2001
		The detailed shape of a metallic Fermi surface can be directly determined in experiments that exploit the de Haas-van Alphen effect, that is, the oscillation of magnetization in response to an external magnetic field.
		The shape and volumes of the three Fermi surface sheets predicted by the band structure were nicely confirmed.
		He is a 3D Fermi liquid with a spherical Fermi surface; the nodes can be placed at the north and south poles.
	www.physicstoday.org /pt/vol-54/iss-1/p42.html (3587 words)

	Fermi energy - Wikipedia, the free encyclopedia (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-10-08)
		For the free electron gas, the Fermi surface is the surface of a sphere; for periodic systems, it generally has a contorted shape (see Brillouin zones).
		The volume enclosed by the Fermi surface defines the number of electrons in the system, and the topology is directly related to the transport properties of metals, such as electrical conductivity.
		K for a metal, hence at room temperature (300 K), the Fermi energy and chemical potential are essentially equivalent.
	en.wikipedia.org.cob-web.org:8888 /wiki/Fermi_energy (946 words)

	Statistical Physics and Low Dimensional Systems
		The surface states of noble metals experience the modification of the potential induced by vicinality or nanostructuration at the surface.
		We attribute this observation to the scattering of the surface state at the molecule and present a multiple scattering simulation allowing the description of the charge redistribution of the investigated molecules.
		Surface sensitive optical spectroscopies such as Surface Differential Reflectance Spectroscopy (SDRS) and Reflectance Anisotropy Spectroscopy (RAS) are suitable tools to study the adsorption of molecules or atoms on the Si(001)-(2x1) surface.
	www.lpm.u-nancy.fr /StatPhysLowDimSyst (9492 words)

	Cyclotron Resonance and the Fermi Surface of Antimony
		The magnetic field of cyclotron resonance in certain regions was dependent upon the angle of tip of the magnetic field with respect to the metal surface.
		The cyclotron mass of one band, assumed to be the conduction band, was consistent with a tilted-ellipsoidal model for the energy surfaces.
		The cyclotron masses of holes and the measurement of cyclotron resonance at limiting points of the Fermi surface indicated that the hole surfaces probably are deformed from an ellipsoid.
	domino.watson.ibm.com /tchjr/journalindex.nsf/4ac37cf0bdc4dd6a85256547004d47e1/c8a96713e139447585256bfa00683ebb?OpenDocument (231 words)

	Fermi gas - Wikipedia, the free encyclopedia (via CobWeb/3.1 planetlab2.cs.unc.edu) (Site not responding. Last check: 2007-10-08)
		The energy distribution of the fermions in a Fermi gas in thermal equilibrium is determined by their density, the temperature and the set of available energy states, via Fermi-Dirac statistics.
		This so-called degeneracy pressure stabilizes a neutron star (a Fermi gas of neutrons) or a White Dwarf star (a Fermi gas of electrons) against the inward pull of gravity.
		The Fermi energy surface in momentum space is known as the Fermi surface.
	en.wikipedia.org.cob-web.org:8888 /wiki/Fermi_gas (358 words)

	Metals and Alloys Group: Surfaces, Interfaces, and Nanoparticles (Site not responding. Last check: 2007-10-08)
		FP-LMTO calculation of the Fermi surface for tetragonal alpha-Pt Si.
		The Fermi surface in the figure exhibits a significant degree of anisotropy, with large and relatively flat sheets oriented along one particular direction.
		The form of the Fermi surface is directly connected to the nature of the tunneling that occurs at the Pt silicide/Si(001) interface.
	www-phys.llnl.gov /Research/Metals_Alloys/Research/Surface (380 words)

	XCrySDen - (X-Window) Crystalline Structures and Densities (Site not responding. Last check: 2007-10-08)
		The left-toolbox is located on the left side, while on the bottom we have a status frame.
		-- toggles the cropping of Fermi surface to BZ
		Instead it uses the pop-up menu which appears upon right mouse button click (the other mouse events are described in the Mouse events for display window section).
	www.xcrysden.org /doc/fermi.html (550 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations
		Knowledge of the Fermi surface is one of the most important requirements for understanding the properties of a metal.
		The results indicated that the Fermi surface was much like a freeelectron surface, and that valuable additional information should become available by extending the measurements to higher fields.
		The shape of the Fermi surface can be well explained in terms of an orthogonalized-plane-wave model using only two parameters, the two Fourier components of the pseudopotential, V/sub 111/ and V/sub 200.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=4085314 (373 words)

	fermisurface
		Life is seen and lived with a sort of detachment, as if we were curiously watching some play or narrative skitter across the surface of our senses.
		fermi surface: "The surface of the Fermi sphere, which separates the occupied from the unoccupied levels...
		As the title reflects, this novel is primarily concerned with a preoccupation of things both above and below the proverbial surface.
	fermisurface.blogspot.com (3465 words)

	Nearly Free Electron Bands (Site not responding. Last check: 2007-10-08)
		The Fermi surface is sketched by taking a constant energy cut such that the area within the Fermi line is half of the area of the Brillouin zone (see left panel of Figure 1.1).
		There will be two Fermi surfaces, one in the upper band and another one in the lower band.
		The Fermi line in the upper band is shown in the right panel of Figure 1.1.
	solidstate.physics.sunysb.edu /book/sample/node1.html (316 words)

	Guide to the Fermi Liquid Construction
		This is a short guide to a series of eleven papers in which a construction of an interacting Fermi liquid in two space dimensions is implemented.
		FKTo4] this tool is combined with a technique developed specifically to handle problems created by the fact that the singularity of the original propagator lies on an object with nontrivial geometry, the Fermi surface.
		The technique is "sectorization of the Fermi surface".
	www.math.ubc.ca /people/faculty/feldman/guide.html (510 words)

	Fermi surface of YAl2
		The Fermi surface consists of various sheets, for which the extremal cross section and the cyclotron mass is carefully calculated.
		The ninth-band Fermi surface is a multiply connected hole sheet, the topology of which is a junglegym running from an X point to a nearest-neighbour X point.
		The tenth-band Fermi surface is an electron sphere centred at the Gamma point, but has bumps in (100) directions.
	stacks.iop.org /0305-4608/10/2207 (281 words)

	Calculated strain dependence of the Fermi surface of rhenium
		The response of the Fermi surface of the HCP transition metal rhenium on hydrostatic pressure and on uniaxial stress and homogeneous dilational strain is determined for the first time using ab initio fully relativistic LMTO band-structure calculations.
		Calculated extremal cross section areas of the Fermi surface of unstrained rhenium as well as the cross section derivatives with respect to the pressure and to the stress and strain along the c axis are in good agreement with experimental data.
		The nature of the observed differences in the strain response of the various sheets of the Fermi surface is briefly discussed.
	stacks.iop.org /0953-8984/3/9033 (249 words)

	Physics News Update Number 457 - Story 20,000 LEAGUES UNDER THE FERMI SEA (Site not responding. Last check: 2007-10-08)
		The Fermi surface or Fermi level represents (in an abstract space in which all electrons are described by their momentum vectors) the highest energy an electron may possess--at zero temperature--in the conduction band of a metal or semiconductor material.
		Conduction electrons, those that stray from their home atoms, are usually drawn from electrons very near the Fermi surface.
		Electrons with lesser energies, and occupying rungs further down on an energy-level diagram, are said to reside in the "Fermi sea" and normally do not effectively contribute to the current.
	www.aip.org /pnu/1999/split/pnu457-2.htm (288 words)

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