scholarly journals Quantum mechanical complementarity probed in a closed-loop Aharonov–Bohm interferometer

2008 ◽  
Vol 4 (3) ◽  
pp. 205-209 ◽  
Author(s):  
Dong-In Chang ◽  
Gyong Luck Khym ◽  
Kicheon Kang ◽  
Yunchul Chung ◽  
Hu-Jong Lee ◽  
...  
Keyword(s):  
Closed Loop ◽  
Quantum Mechanical ◽  
Aharonov Bohm

scholarly journals Beating of Aharonov-Bohm oscillations in a closed-loop interferometer

2007 ◽  
Vol 76 (3) ◽  
Author(s):  
Sanghyun Jo ◽  
Gyong Luck Khym ◽  
Dong-In Chang ◽  
Yunchul Chung ◽  
Hu-Jong Lee ◽  
...  
Keyword(s):  
Closed Loop ◽  
Aharonov Bohm

Complementarity in a Closed-Loop Aharonov-Bohm Interferometer

2008 ◽  
Vol 53 (9(6)) ◽  
pp. 3640-3644
Author(s):  
GyongLuck Khym ◽  
Kicheon Kang ◽  
Dong-In Chang ◽  
Hu-Jong Lee ◽  
Yunchul Chung
Keyword(s):  
Closed Loop ◽  
Aharonov Bohm

scholarly journals PHASE TIME FOR A TUNNELING PARTICLE

2007 ◽  
Vol 21 (10) ◽  
pp. 1681-1704 ◽  
Author(s):  
SWARNALI BANDOPADHYAY ◽  
A. M. JAYANNAVAR
Keyword(s):  
Time Delays ◽  
Arrival Time ◽  
Quantum Mechanical ◽  
Quantum Networks ◽  
Potential Barriers ◽  
Phase Time ◽  
Hartman Effect ◽  
Aharonov Bohm ◽  
Negative Time ◽  
Two Barriers

We study the nature of tunneling phase time for various quantum mechanical structures such as networks and rings having potential barriers in their arms. We find the generic presence of the Hartman effect, with superluminal velocities as a consequence, in these systems. In quantum networks, it is possible to control the "super arrival" time in one of the arms by changing the parameters on another arm which is spatially separated from it. This is yet another quantum nonlocal effect. Negative time delays (time advancement) and "ultra Hartman effect" with negative saturation times have been observed in some parameter regimes. In the presence and absence of Aharonov-Bohm (AB) flux, quantum rings show the Hartman effect. We obtain the analytical expression for the saturated phase time. In the opaque barrier regime, this is independent of even the AB flux thereby generalizing the Hartman effect. We also briefly discuss the concept of "space collapse or space destroyer" by introducing a free space in between two barriers covering the ring. Further, we show in presence of absorption that the reflection phase time exhibits the Hartman effect in contrast to the transmission phase time.

Observation of a gravitational Aharonov-Bohm effect

Science ◽  
2022 ◽  
Vol 375 (6577) ◽  
pp. 226-229 ◽  
Author(s):  
Chris Overstreet ◽  
Peter Asenbaum ◽  
Joseph Curti ◽  
Minjeong Kim ◽  
Mark A. Kasevich
Keyword(s):  
Wave Packets ◽  
Gravitational Interaction ◽  
Large Mass ◽  
Mechanical Effect ◽  
Quantum Mechanical ◽  
Electron Wave ◽  
Rubidium Atoms ◽  
Quantum Mechanical Effect ◽  
Bohm Effect ◽  
Aharonov Bohm

Gravitational interference The Aharonov-Bohm effect is a quantum mechanical effect in which a magnetic field affects the phase of an electron wave as it propagates along a wire. Atom interferometry exploits the wave characteristic of atoms to measure tiny differences in phase as they take different paths through the arms of an interferometer. Overstreet et al . split a cloud of cold rubidium atoms into two atomic wave packets about 25 centimeters apart and subjected one of the wave packets to gravitational interaction with a large mass (see the Perspective by Roura). The authors state that the observed phase shift is consistent with a gravitational Aharonov-Bohm effect. —ISO

BRAID GROUPS, ANYONS AND GAUGE INVARIANCE

1991 ◽  
Vol 05 (10) ◽  
pp. 1649-1664 ◽  
Author(s):  
Yong-Shi Wu
Keyword(s):  
Mechanical Properties ◽  
Braid Group ◽  
Group Analysis ◽  
Braid Groups ◽  
Quantum Mechanical ◽  
The Novel ◽  
And Topology ◽  
Bohm Effect ◽  
Aharonov Bohm ◽  
Nontrivial Topology

The structure of braid groups on topologically nontrivial surfaces is reviewed. The physical meaning of the braid relations and their implications on quantum mechanical properties of anyonic quasiparticles are discussed. These include not only the exotic statistics of anyons but also the Aharonov-Bohm effect for the anyons on a surface with holes. Several results on the novel properties of anyons or their states, which were previously derived by microscopic considerations, are reproduced by this seemingly kinematic and topology-dependent braid group analysis. It is suggested that in the thermodynamic limit, the global excitations in a system on a surface of nontrivial topology do not interfere with properties of local anyonic quasiparticles.

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.

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