✎ Aharonov-Bohm Experiment [The Physics Travel Guide]

You've loaded an old revision of the document! If you save it, you will create a new version with this data.

====== The Aharonov-Bohm Experiment ======

<note tip>
Explanations in this section should contain no formulas, but instead colloquial things like you would hear them during a coffee break or at a cocktail party.
</note>
  
<tabbox Student>

* The best explanation can be found here: http://gregnaber.com/wp-content/uploads/GAUGE-FIELDS-AND-GEOMETRY-A-PICTURE-BOOK.pdf at page 18ff

<blockquote>For quite some time it was felt that such phase changes in the wavefunction
were of no physical significance since all of the physically measurable quantities associated with the charge q depend only on the squared modulus $|ψ|^2$
and this is the same for $ψ$ and $e^{iqΩ} ψ$. However, in 1959, Aharonov and Bohm
[AB] suggested that, while the phase of a single charge may well be unmeasurable, the relative phase of two charged particles that interact should have
observable consequences. They proposed an experiment that went roughly
as follows: A beam of electrons is split into two partial beams that pass
around opposite sides of a solenoid (this is a very tightly wound coil of wire
through which a current passes, creating a magnetic field that is confined
inside the coil ). Beyond the solenoid the beams are recombined and detected
at a screen. The result is a typical interference pattern that manifests itself
experimentally as a variation from point to point on the screen of the prob-
ability of detecting a particle there. One observes this interference pattern
when there is no current flowing through the coil, so that the magnetic field
in the solenoid is zero, and then again when there is a current and hence a
nonzero magnetic field inside the coil. Since the electrons pass around the coil
and the magnetic field is confined inside the coil, any shift in the interference
pattern in these two cases cannot be attributed to the magnetic field (which
the electrons do not encounter). The vector potential, on the other hand,
is generally nonzero outside the solenoid even though the magnetic field in
this region is always zero. One could then only conclude that this vector potential induces different phase shifts on the two partial beams before they
are recombined and that these relative phase changes account for the altered
interference pattern. This experiment has, in fact, been performed (first by
R. G. Chambers in 1960) with results that confirmed the expectations of
Aharonov and Bohm.<cite>page 6 in Topology, Geometry and Gauge Fields: Foundations by Naber</cite></blockquote>
 
<tabbox Researcher>

<note tip>
The motto in this section is: //the higher the level of abstraction, the better//.
</note>

--> Example1#

<--

--> Example2:#

<--

</tabbox>

Please solve the following equation to prove you're human. 217 -12 = Please keep this field empty:

Edit summary

Note: By editing this page you agree to license your content under the following license: CC Attribution-Share Alike 4.0 International

User Tools

Site Tools

Page Tools