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BEGIN:VEVENT
DTSTAMP:20261020T060627Z
LAST-MODIFIED:20140331T150034Z
DTSTART:20140402T150000Z
DTEND:20140402T160000Z
UID:event1255@bu.edu
URL:http://physics.bu.edu/internal/events/show/1255
SUMMARY:Emergence of Orbital Chirality in Multi-orbital Surface Bands
DESCRIPTION:Featuring Jung Hoon Han\, Sungkyunkwan University\nHosted by: C
	laudio Chamon\n\nPart of the Condensed Matter Theory Seminar Series.\n\nAbs
	tract:  A common wisdom in surface science is that the inversion \nsymmetry
	 breaking (ISB) at the surface is the origin\, together with the \nspin-orb
	it effect\, of the celebrated Rashba effect on the surface \nelectronic str
	ucture. In this talk I will argue that a generic \nconsequence of ISB in mu
	lti-orbital bands (such as generated by \nt_{2g}-orbitals or p-orbitals)\, 
	even in the absence of any spin-orbit \ncoupling\, is the emergence of "orb
	ital chirality". While similar to spin \nchirality due to the Rashba effect
	\, the proposed orbital chirality \nsplitting occurs in +1\, 0\, -1 orbital
	 angular momentum (OAM) sectors. \nThe new effect is dubbed the orbital Ras
	hba effect. Circular dichroism \n(CD) ARPES is shown to be an effective pro
	be of the orbital chirality in \nthe band structure\, and I will present re
	cent demonstrations of this in \nsimple surface bands of Cu and Ag. The mor
	e challenging case of strongly \nspin-orbit-coupled bands of Bi2Se3 surface
	 will be briefly mentioned\, \nalong with several conflicting interpretatio
	ns surrounding the same sort \nof CD-ARPES measurements.\nAs applications o
	f this idea I will talk about possible p-wave-type \nKondo pairing in ultra
	thin Kondo lattice material\, orbital analogue of\nDzyaloshinskii-Moriya in
	teraction in the Mott limit\, and possible \nrelevance in spin-transfer tor
	que measured in ultrathin magnetic films. \nTime permitting\, I will discus
	s ongoing investigation of the orbital \nchirality structure in the surface
	 bands of SrTiO3.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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