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UID:UW-Physics-Event-3088
DTSTART:20131121T160000Z
DURATION:PT1H0M0S
DTSTAMP:20260419T212109Z
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<br>
\nspace\, termed 
 Weyl nodes\, that are characterized by a deinotnite topological charge
 : the chirality. Consequently\,<br>
\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.<br>
\n
URL:https://www.physics.wisc.edu/events/?id=3088
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