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Topic: Aharonov Bohm effect

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Aharonov-Bohm effect - Wikipedia, the free encyclopedia The earliest form of this effect was predicted by Werner Ehrenberg and R.E. Siday in 1949, and similar effects were later rediscovered by Aharonov and Bohm in 1959. The Aharonov-Bohm effect, sometimes called the Ehrenberg-Siday-Aharonov-Bohm effect, is a quantum mechanical phenomenon by which a charged particle is affected by electromagnetic fields in regions from which the particle is excluded. The most commonly described case, sometimes called the Aharonov-Bohm solenoid effect, is when the wave function of a charged particle passing around a long solenoid experiences a phase shift as a result of the enclosed magnetic field, despite the magnetic field being zero in the region through which the particle passes. en.wikipedia.org /wiki/Aharonov-Bohm_effect   (1372 words)

TAU Quantum Group - Topological Effects in Quantum Mechanics Aharonov and Bohm showed that the appearance of these potentials has a subtle and remarkable consequence: electrons moving in a region free of electric and magnetic fields can respond to electric and magnetic fields elsewhere. While the AB and AC effects are due to electromagnetic potentials, a third effect, the Aharonov-Susskind (AS) effect [10], is not. An analogous topological effect is the Aharonov-Casher (AC) effect [7], in which particles that carry a magnetic moment acquire a nontrivial phase while encircling a charged wire. www.tau.ac.il /~quantum/publicat/topo-effects.html   (1118 words)

Bohm & the implicate order This phenomenon is now known as the Aharonov-Bohm (AB) effect, and when the discovery was first announced many physicists reacted with disbelief. Bohm believed that life and consciousness are enfolded deep in the generative order and are therefore present in varying degrees of unfoldment in all matter, including supposedly 'inanimate' matter such as electrons or plasmas. Bohm realized that when the ink was diffused through the glycerin it was not in a state of 'disorder' but possessed a hidden, or nonmanifest, order. ourworld.compuserve.com /homepages/dp5/bohm.htm   (2158 words)

Geometric phase - Wikipedia, the free encyclopedia In the case of the Aharonov-Bohm effect, the adiabatic parameter is the magnetic field inside the solenoid. It appears in particular in the theory of the Aharonov-Bohm effect and of the conical intersection of potential energy surfaces. It was named after Sir Michael Berry, and is also known as Pancharatnam-Berry or geometric phase. en.wikipedia.org /wiki/Berry_phase   (401 words)

Aharonov-Bohm effect The Aharonov-Bohm effect is a quantum mechanical phenomenon by which a charged particle affected by electromagnetic fields in regions from the particle is excluded first proposed by and Bohm in 1959. The most commonly described case sometimes called Aharonov-Bohm solenoid effect is where a charged particle passing a long solenoid experiences a quantum phase shift as result of the enclosed magnetic field despite magnetic field being zero in the region which the particle passes. The magnetic Aharonov-Bohm effect is also closely to Dirac's argument that the existence of a magnetic monopole necessarily implies that both electric and charges are quantized. www.freeglossary.com /Solenoid_effect   (1172 words)

Aharonov-Bohm The Aharonov-Bohm effect demonstrates that the electromagnetic potentials, rather than the electric and magnetic fields, are the fundamental quantities in quantum mechanics. For a single-slit geometry the Aharonov-Bohm effect is suppressed because there are no topologically distinct paths for the particle to pass through the slit. The Aharonov-Bohm effect vanishes as the number of interfering alternatives decreases. rugth30.phys.rug.nl /quantummechanics/ab.htm   (613 words)

On A Testable Unification Of EM, GR and QM Effect On GR As a result of this artificial restriction of Maxwell's theory, Einstein also inadvertently restricted his theory of general relativity, forever preventing the unification of electromagnetics and relativity. The new interpretation is consistent with Bohm's hidden variable theory, and it is also consistent with the Schroedinger equation, which in the QM model already propagates the QM states forward in time with absolute determinism. Interestingly, the renowned physicist David Bohm has shown that a hidden variable theory of quantum mechanics can actually be constructed, whereby one could potentially engineer physical change.[Ref 33] It is well-known that experimental physics does not in any manner refute hidden variable theories. www.geocities.com /Area51/Shadowlands/9654/bearden/testunify.html   (5158 words)

Aharonov-Bohm Effect in Synchrotron Radiation Peculiarities of the radiation related to the presence of the AB solenoid may be considered as a manifestation of the Aharonov-Bohm effect in the radiation. Radiation peculiarities caused by the presence of the solenoid may be considered as a manifestation of Aharonov-Bohm effect in the radiation. We study the impact of Aharonov-Bohm solenoid on the radiation of a charged particle moving in a constant uniform magnetic field. www.sbf1.sbfisica.org.br /eventos/enfpc/xxi/procs/res55   (1555 words)

Nanolithography with an atomic force microscope: quantum point contacts, quantum dots, and quantum rings The finite conductance due to the Kondo effect was used for an analysis of the phase evolution of this Aharonov-Bohm effect in the Coulomb-blockade valley. This effect caused by strong electron-electron interactions was attributed to the small number of electrons.We found Aharonov-Bohm oscillations of the conductance in the Kondo regime as well. The attached in-plane gates allow to tune the phase of the Aharonov-Bohm effect at zero magnetic field and we observed the typical sharp phase jumps by π that are related to the asymmetry of our device. www.nano.uni-hannover.de /dissertationen/abs-keyser.html   (887 words)

PhysicsWeb - Physics World - Quantum change for nanotubes (July 2004) The Aharonov-Bohm effect has become famous in mesoscopic physics, where it causes the resistance of micron-sized metallic and semiconducting cylinders and rings to oscillate as a function of the strength of an applied magnetic field. Magneto-optical and magneto-electronic nanotube devices based on the Aharonov-Bohm effect will probably always be out of reach because they require a magnet that can produce a field of 1000 T. Such a device is a dream that not even Hendrik Schön would be able to publish. These experiments provide a consistent confirmation of the combined effect of the Bloch theorem and the Aharonov-Bohm effect, although some of the details still need to be resolved. qt.tn.tudelft.nl /~yuki/leo_publi/PDF/04physicsworld_jing.htm   (1452 words)

PhilSci Archive - A versus B! Topological nonseparability and the Aharonov-Bohm effect We show that the conception of nonlocality encountered in the Aharonov-Bohm effect is closely related to the nonseparability which is common in quantum mechanics albeit distinct from it due to its topological nature. Eynck, Tim Oliver and Lyre, Holger and Rummell, Nicolai von (2001) A versus B! Topological nonseparability and the Aharonov-Bohm effect. Since its discovery in 1959 the Aharonov-Bohm effect has continuously been the cause for controversial discussions of various topics in modern physics, e.g. philsci-archive.pitt.edu /archive/00000404   (201 words)

Visual Quantum Mechanics For certain values of the magnetic field strength, the effect becomes unmeasurable (if the flux is an integer multiple of 2 pi). Although the wave packet has no contact with the magnetic field strength, there is a measurable interference effect (the black line behind the obstacle). The measurable influence on the wave function depends only on the flux of the magnetic field (i.e., on the circulation of the vector potential). www.kfunigraz.ac.at /imawww/vqm/pages/samples/106_20a.html   (192 words)

pubs.html * ``The effects of dissipation and temperature on macroscopic quantum tunnelling,'' Phys Rev Lett 54, 2712-5 (1985). ``Effects of parallel magnetic field on the novel new metallic behavior in two dimensions,'' Proc Int Conf Phys Semiconductors 25, 2000. * ``The quantized Hall effect in the presence of back-scattering.'' Phys Rev Lett 61, 2801-4 (1988). www.physics.unc.edu /~sean/pubs.html   (3907 words)

Science News: Gauging the Aharonov-Bohm effect. (magnetic fil... @ HighBeam Research The Aharonov-Bohm effect can be interpreted to mean that the magnetic field acts on the phases of the electron waves through the vector potential. Since 1959 several experiments, including one reported by Tonomura's group in 1982, have purported to show the Aharonov-Bohm effect, but they have been severely criticized on grounds that magnetic field might be leaking into the space traversed by the electrons. In addition to action at a distance, the Aharonov-Bohm effect has another interpretation, related to a mathematical quantity known as the electromagnetic vector potential. www.highbeam.com /library/doc0.asp?DOCID=1G1:4151438&refid=holomed_1   (754 words)

Forces from Potential Momentum In the Aharonov-Bohm effect the potential momentum didn't result in any force on the particle -- its only manifestation was to change the particle's wavelength. The total force on a particle due to all possible effects involving the potential energy and the potential momentum is given by In such situations the potential momentum's presence is only revealed by quantum mechanical effects. www.physics.nmt.edu /~raymond/classes/ph13xbook/node142.html   (163 words)

THE ELECTROMAGNETIC AHARONOV BOHM EFFECT The Aharonov Bohm effect due to a static magnetic field is explained as in my paper the corrected proofs of which were distributed a couple of days ago. The electromagnetically induced Aharonov Bohm effect should be obervable by replacing the iron whisker in the well known Chambers experiment by a circularly polarized electromagnetic beam. If verified this effect seems to have many important consequences in radar, signalling, stealth technology and electronics, and in explaining biological processes, so it is probably important for RF shielding. www.aias.us /Comments/comments02182004.html   (418 words)

Scalar Waves/Aharonov-Bohm Effect/A-Vector Potential Abstract: Active in the areas of the Aharonov-Bohm effect as applied to the A-vector potential and scalar fields as applied to solving force related problems. Yoseph Imry and Richard A. Webb, "Quantum Interference and the Aharonov-Bohm Effect," Scientific American, vol. This quantum-mechanical effect is being brought tobear on the development of new microelectronic devices. www.unusualresearch.com /scalarbib/scalarbib.htm   (895 words)

Stirniman's Electrogravitics Reference List Aharonov and Bohm discover that an effect can occur on an electrically charged particle due to the magnetic vector potential, in regions of space where the classic Maxwell fields vanish. A dual of the Aharonov-Bohm effect is the Aharonov-Casher effect, where it is shown that measurable effects of spin-precession of a particle's magnetic moment can occur due to the electric potential, even in areas of space where the classical electrical field is completely absent. An effect on wavelength would be manifested as a change in the envelope of the interference pattern, rather than merely a shift in the pattern. www.eskimo.com /~bilb/freenrgl/gravres2.html   (15587 words)

Quantum Computation with Persistent-current Aharonov-Bohm Qubits and Qugates We propose that Aharonov-Bohm effect can be used for quantum computation. The effect consists of existence of persistent currents in mesoscopic/nanoscopic loops of normal metal or semiconductor in a magnetic field perpendicular to loop. The qugate operations are therefore effected by a radiation free couplings between the qubits making persistent-current qubits scalable elements in a quantum network. www.nsti.org /Nanotech2003/showabstract.html?absno=106   (137 words)

SDL: Item 1963/201 We finally use our phase factor to analyze the Aharonov-Bohm effect produced by an infinite tube-like matter distribution as proposed by Ford and Vilenkin. A further term in the phase is considered which accounts for the effects of gravitational and inertial forces observed in diffraction experiments with coherent neutron beams (COW experiments). digitallibrary.sissa.it /handle/1963/201   (136 words)

termpapers Aharonov-Bohm like effect for neutral particles in electromagnetic field due to magnetic moment of neutron (I think). While some examples were known (Aharonov-Bohm phase is one), Berry in 1984 recognized the generalization and opened up study of many new effects. This is an effect in which a nucleus in a solid absorbing or emitting a gamma ray can avoid recoiling by transferring its momentum to the entire crystal, thus preventing Doppler broadening of spectral lines. www.phys.ufl.edu /~pjh/teaching/phy4605/papers_4605.html   (800 words)

The Quantum Exchange In addition, the effects of changing the topology of the system are discussed and displayed. This web page illustrates the effect of a magnetic flux on the interference of a quantum double-slit experiment. The time-dependent scattering patterns are shown with and without a magnetic field. www.compadre.org /quantum/items/detail.cfm?ID=1129   (257 words)

Identical particles The magnetic flux through the red area is chosen such that for a single particle the shift in the diffraction pattern due to the Aharonov-Bohm effect is 180°. The correlated two-particle signal also shows the Aharonov-Bohm effect, as can be clearly seen by substracting the B = 0 and B = B' signals. The correlated two-particle signal also shows the Aharonov-Bohm effect, as can be clearly seen by subtracting the B = 0 and B = B' signals. rugth30.phys.rug.nl /quantummechanics/idpart.htm   (736 words)

Ricardo Weder at MSRI - Aharonov-Bohm effect and time-dependent inverse scattering theory Ricardo Weder at MSRI - Aharonov-Bohm effect and time-dependent inverse scattering theory Ricardo Weder - Aharonov-Bohm effect and time-dependent inverse scattering theory www.msri.org /communications/ln/msri/2001/ipapps/weder/1   (22 words)

Aharonov-Bohm effect in phase shifts We discuss the influence of the Aharonov-Bohm effect on phase shifts. The general integral representation of phase shifts for short-range potentials with an Aharonov-Bohm flux at the origin is given. www.edpsciences.org /articles/euro/abs/2002/09/7063/7063.html   (137 words)

Citebase - Nonassociativity, Dirac monopoles and Aharonov-Bohm effect Authors: Nesterov, Alexander I. The Aharonov-Bohm (AB) effect for the singular string associated with the Dirac monopole carrying an arbitrary magnetic charge is studied. Citebase - Nonassociativity, Dirac monopoles and Aharonov-Bohm effect It is shown that the emerging difficulties in explanation of the AB effect may be removed by introducing nonassociative path-dependent wave functions. citebase.eprints.org /cgi-bin/citations?id=oai:arXiv.org:hep-th/0503034   (809 words)

The Aharonov-Bohm effect for an exciton (ResearchIndex) @misc{ mer-aharonovbohm, author = "R. Römer and M. Raikh", title = "The Aharonov-Bohm effect for an exciton", url = "citeseer.ist.psu.edu/202308.html" } 24.7%: The Aharonov-Bohm effect for an exciton - Römer, Raikh The origin of the effect is the finite... citeseer.ist.psu.edu /202308.html   (242 words)

Nonradiating sources, the Aharonov-Bohm effect, and the question of measurability of electromagnetic potentials The new NR source developments are discussed in connection with the question of measurability of electromagnetic potentials as enabled by the Aharonov-Bohm (A-B) effect, whereby quantum mechanical effects of the potentials can be observed in regions of vanishing electromagnetic fields but nonvanishing electromagnetic potentials. Citation: Marengo, E., and R. Ziolkowski (2002), Nonradiating sources, the Aharonov-Bohm effect, and the question of measurability of electromagnetic potentials, Radio Sci. Nonradiating sources, the Aharonov-Bohm effect, and the question of measurability of electromagnetic potentials www.agu.org /pubs/crossref/2002/2001RS002551.shtml   (263 words)

01-415 The history of the effect goes four decades back and starts from the observation of Aharonov and Bohm \cite{AB} that the behavior of a charged quantum particle is influenced by a magnetic flux even if the field is zero in the region where the particle is localized. The generalised boundary conditions may be regarded as a combination of the Aharonov-Bohm effect with a point interaction. These generalised boundary conditions may be interpreted as a combination of the AB effect with a point interaction supported, too, at the origin, although this is just one possible point of view. www.ma.utexas.edu /mp_arc/html/papers/01-415   (3945 words)

QM as defects in a solid media. I had never heard of this effect before, and it struck me as quite amazing, since classical particles have no phase with which field effects can be imparted upon them as in the quantum Aharonov-Bohm effect, and so I had to take the cited article on this effect on faith for the moment. They cite a classical "gravitational Aharonov-Bohm effect" whereby particles moving in curvature-free regions of spacetime can exhibit effects due to non-zero curvature in regions from which the particels are forbidden. We analyze this effect in an elastic medium with one and N defects. www.physicsforums.com /showthread.php?p=877709#post877709   (832 words)

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