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VERSION:2.0
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BEGIN:VEVENT
DTSTAMP:20260814T083739Z
LAST-MODIFIED:20150211T153057Z
DTSTART:20150213T170000Z
DTEND:20150213T180000Z
UID:event1397@bu.edu
URL:http://physics.bu.edu/internal/events/show/1397
SUMMARY:Dirac fermions and broken symmetries in topological crystalline ins
	ulators
DESCRIPTION:Featuring Ilija Zeljkovic\, Boston College\n\nPart of the Bioph
	ysics/Condensed Matter Seminar Series.\n\nAbstract:\nTopological crystallin
	e insulators (TCIs) are a recently discovered class of topological material
	s which harbor massless Dirac surface states (SS). Theory predicts that the
	se SS are protected by crystalline symmetries\, and that SS electrons can a
	cquire a mass if these symmetries are broken. In this talk\, I will present
	 our recent scanning tunneling microscopy (STM) investigations of the TCI P
	b1-xSnxSe utilizing two different spectroscopic methods: quasiparticle inte
	rference imaging and Landau level spectroscopy. First\, based on the interf
	erence patterns of scattered surface electrons\, we uncover a distinct orbi
	tal texture of the Dirac bands in TCIs. Moreover\, simultaneous imaging of 
	the atomic and electronic structures reveals that a fraction of the Dirac e
	lectrons acquire mass due to a broken mirror symmetry. Our experiments sugg
	est a novel pathway for manipulation of electrons in two-dimensional system
	s via lattice distortions.
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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