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[Fizinfo] BME-MTA Egzotikus Kvantum Fázisok csoport szemináriuma, szep. 27. kedd


Chronological Thread 
  • From: Andras Palyi <andraspalyi AT caesar.elte.hu>
  • To: FIZINFO AT lists.kfki.hu
  • Subject: [Fizinfo] BME-MTA Egzotikus Kvantum Fázisok csoport szemináriuma, szep. 27. kedd
  • Date: Thu, 22 Sep 2016 18:30:17 +0200

Kedves Kollégák!

2016. szeptember 27-én kedden 14:15-től Gyenis András (Princeton University,
USA) tart előadást a BME Fizikai Intézetében. Előadásának címe:

"Imaging electronic states on topological Dirac and Weyl semimetals using
scanning tunneling microscopy”

Az előadás helyszíne a BME Elméleti Fizika Tanszék szemináriumi szobája. (BME
F épület 3. lépcsőház, magasföldszint)

Kivonat:
“Following the intense studies on topological insulators, significant efforts
have recently been devoted to the search for gapless topological systems.
These materials not only broaden the topological classification of matter but
also provide a condensed matter realization of various relativistic particles
and phenomena previously discussed mainly in high energy physics. Weyl
semimetals host massless, chiral, low-energy excitations in the bulk
electronic band structure, whereas a symmetry protected pair of Weyl fermions
gives rise to massless Dirac fermions. On the surface, topological semimetals
harbor protected states, with arced Fermi surface contours that are predicted
to propagate through the bulk when their momentum matches that of the surface
projections of the bulk's nodes. We employed scanning tunneling
microscopy/spectroscopy to explore the behavior of electronic states both on
the surface and in the bulk of topological semimetal phases. By mapping the
quasiparticle interference and emerging Landau levels at high magnetic field
in Dirac semimetals Cd3As2 and Na3Bi, we observed extended Dirac-like bulk
electronic bands. Quasiparticle interference imaged on Weyl semimetal TaAs
demonstrated the predicted momentum dependent delocalization of Fermi arc
surface states in the vicinity of the surface-projected Weyl nodes. Our
findings provide evidence that Weyl nodes act as sinks for electron transport
on the surface of these materials.

S. Jeon, B. Zhou et al. Nature Materials 13, 851 (2014)
S. Kushwaha et al. APL Materials 3, 041504 (2015)
H. Inoue, A. Gyenis et al. Science 351, 1184 (2016)”

Minden érdeklődőt szeretettel várunk.

A szemináriumsorozat további programja:
http://exotic.phy.bme.hu/seminars.html

Üdvözlettel,
Pályi András




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