The Aharonov-Bohm Effect and Long-Range Phase Coherence in Normal Metal Rings

1997 ◽  
pp. 214-227
Author(s):  
R. A. WEBB ◽  
S. WASHBURN ◽  
A. D. BENOIT ◽  
C. P. UMBACH ◽  
R. B. LAIBOWITZ
Keyword(s):  
Long Range ◽  
Phase Coherence ◽  
Normal Metal ◽  
Metal Rings ◽  
Bohm Effect ◽  
Aharonov Bohm

Periodicity of the Aharonov-Bohm effect in normal-metal rings

1986 ◽  
Vol 56 (2) ◽  
pp. 189-192 ◽  
Author(s):  
A. Douglas Stone ◽  
Y. Imry
Keyword(s):  
Normal Metal ◽  
Metal Rings ◽  
Bohm Effect ◽  
Aharonov Bohm

Currents in Normal‐Metal Rings Exhibit Aharonov–Bohm Effect

Physics Today ◽  
1986 ◽  
Vol 39 (1) ◽  
pp. 17-20 ◽  
Author(s):  
Bertram Schwarzschild
Keyword(s):  
Normal Metal ◽  
Metal Rings ◽  
Bohm Effect ◽  
Aharonov Bohm

NOVEL INTERFERENCE EFFECTS IN MULTIPLY CONNECTED NORMAL METAL RINGS

1994 ◽  
Vol 08 (05) ◽  
pp. 301-310 ◽  
Author(s):  
A.M. JAYANNAVAR ◽  
P. SINGHA DEO
Keyword(s):  
Quantum Interference ◽  
Normal Metal ◽  
Quantum Mechanical ◽  
Small Field ◽  
Interference Effects ◽  
Multiply Connected ◽  
Small Magnetic Field ◽  
Metal Rings ◽  
Bohm Effect ◽  
Aharonov Bohm

We have investigated the magnetoconductance of a normal metal loop connected to ideal wires in the presence of magnetic flux. The quantum mechanical potential, V, in the loop is much higher than that in the connecting wires (V=0). The electrons with energies less than the potential height on entering the loop propagate as evanescent modes. In such a situation, the contribution to the conductance arises from two non-classical effects, namely, Aharonov-Bohm effect and quantum tunneling. For this case we show that, on application of a small magnetic field, the conductance initially always decreases, or small field magnetoconductance is always negative. This is in contrast to the behavior in the absence of the barrier, wherein the small field magnetoconductance is either positive or negative depending on the Fermi energy and other geometric details. We also discuss the possibility of a better switch action based on quantum interference effects in such structures.

scholarly journals Normal-metal Aharonov-Bohm effect in the presence of a transverse electric field

1987 ◽  
Vol 59 (16) ◽  
pp. 1791-1794 ◽  
Author(s):  
S. Washburn ◽  
H. Schmid ◽  
D. Kern ◽  
R. A. Webb
Keyword(s):  
Electric Field ◽  
Transverse Electric ◽  
Transverse Electric Field ◽  
Normal Metal ◽  
Bohm Effect ◽  
Aharonov Bohm

Monopole charge quantization and the Aharonov–Bohm effect

1984 ◽  
Vol 62 (8) ◽  
pp. 737-740 ◽  
Author(s):  
G. Kunstatter
Keyword(s):  
Long Range ◽  
Quantization Condition ◽  
Simple Derivation ◽  
Asymptotic Field ◽  
Dirac Monopole ◽  
Charge Quantization ◽  
Bohm Effect ◽  
Field Lines ◽  
Aharonov Bohm ◽  
Electrically Charged

We present a simple derivation of the Dirac monopole charge quantization condition, making explicit use of the Aharonov–Bohm effect. Since only the asymptotic field lines of the monopole play a crucial role, this derivation clearly shows that the quantization condition must hold unless the electrically charged particle and the monopole exchange new long-range forces. In particular, this implies that Cabrera's monopole event would be consistent with Fairbank's observations of free quarks only if the monopole carried long-range (unconfined) colour-magnetic fields.

scholarly journals Direct observation of ensemble averaging of the Aharonov-Bohm effect in normal-metal loops

1986 ◽  
Vol 56 (4) ◽  
pp. 386-389 ◽  
Author(s):  
C. P. Umbach ◽  
C. Van Haesendonck ◽  
R. B. Laibowitz ◽  
S. Washburn ◽  
R. A. Webb
Keyword(s):  
Direct Observation ◽  
Normal Metal ◽  
Ensemble Averaging ◽  
Bohm Effect ◽  
Aharonov Bohm

scholarly journals AHARONOV-BOHM EFFECT IN THE PRESENCE OF EVANESCENT MODES

1996 ◽  
Vol 10 (26) ◽  
pp. 3595-3608 ◽  
Author(s):  
B.C. GUPTA ◽  
P. SINGHA DEO ◽  
A.M. JAYANNAVAR
Keyword(s):  
Fermi Energy ◽  
Normal Metal ◽  
Resonant States ◽  
Theoretical Finding ◽  
Bohm Effect ◽  
Aharonov Bohm

It is known that differential magnetoconductance of a normal metal loop connected to reservoirs by ideal wires is always negative when an electron travels as an evanescent modes in the loop. This is in contrast to the fact that the magnetoconductance for propagating modes is very sensitive to small changes in geometric details and the Fermi energy and moreover it can be positive as well as negative. Here we explore the role of impurities in the leads in determining the magnetoconductance of the loop. We find that the change in magnetoconductance is negative and can be made large provided the impurities do not create resonant states in the systems. This theoretical finding may play a useful role in quantum switch operations.

SPONTANEOUS CURRENTS IN MESOSCOPIC AND MACROSCOPIC SYSTEMS

1994 ◽  
Vol 08 (27) ◽  
pp. 1667-1682
Author(s):  
M.Y. CHOI
Keyword(s):  
Josephson Junction ◽  
Ground States ◽  
The Other ◽  
Spin Currents ◽  
Metal Rings ◽  
Other Hand ◽  
Josephson Junction Array ◽  
Junction Array ◽  
Bohm Effect ◽  
Aharonov Bohm

The possibility of current-carrying ground states due to the Aharonov-Casher and the Aharonov-Bohm effect in mesoscopic and macroscopic systems is discussed in detail. In mesoscopic metal rings, the interplay between the two effects is not separable, and the spontaneous spin currents via the Aharonov-Casher effect are dominated by the charge currents due to the Aharonov-Bohm effect. In an annulus-shaped Josephson junction array, on the other hand, only the Aharonov-Casher effect comes in; the corresponding vortex current generates a spontaneous voltage across the annulus, which appears to be observable.

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