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UID:UW-Physics-Event-3088
DTSTART:20131121T160000Z
DURATION:PT1H0M0S
DTSTAMP:20240319T085152Z
LAST-MODIFIED:20131113T221537Z
LOCATION:5310 Chamberlin
SUMMARY:Probing the chiral anomaly with nonlocal transport in Weyl sem
imetals\, R. G. Herb Condensed Matter Seminar\, Dmytro Pesin\, Univers
ity of Utah
DESCRIPTION:Weyl semimetals are three-dimensional crystalline systems
where pairs of bands touch at points in momentum
\nspace\, termed
Weyl nodes\, that are characterized by a deinotnite topological charge
: the chirality. Consequently\,
\nthey exhibit the Adler-Bell-Jack
iw anomaly\, which in this condensed matter realization implies that a
pplication of parallel electric (E) and magnetic (B) inotelds pumps el
ectrons between nodes of opposite chirality at a rate proportional to
E*B. We argue that this pumping is measurable via nonlocal transport e
xperiments\, in the limit of weak internode scattering. Speciinotcally
\, we show that as a consequence of the anomaly\, applying a local mag
netic inoteld parallel to an injected current induces a valley imbalan
ce that diffuses over long distances. A probe magnetic inoteld can the
n convert this imbalance into a measurable voltage drop far from sourc
e and drain. Such nonlocal transport vanishes when the injected curren
t and magnetic inoteld are orthogonal\, and therefore serves as a test
of the chiral anomaly. Since the nodes are analogous to valley degree
s of freedom in semiconductors\, this suggests that valley currents in
Weyl semimetals can be controlled using electric inotelds\, which has
potential practical aEuro~valleytronicaEuroTM applications.
\n
URL:https://www.physics.wisc.edu/events/?id=3088
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