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DTSTAMP:20260905T194224Z
LAST-MODIFIED:20170418T181620Z
DTSTART:20170426T181500Z
DTEND:20170426T191500Z
UID:event1761@bu.edu
URL:http://physics.bu.edu/internal/events/show/1761
SUMMARY:Orbital-Spin Texture and Landau Levels in Two-Dimensional Rashba-Di
	rac Lead Chalcogenides
DESCRIPTION:Featuring Paul Hanakata\n\nPart of the Preliminary Oral Exam.\n
	\nExamining committee: David Campbell\, Harold Park\, So-Young Pi\, Anna Sw
	an \n\nAbstract:  We study two-dimensional lead chalcogenides PbX (X=S\, Se
	\, Te) using first-principles based on density functional theory framework.
	 Due to the heavy Pb element with strong spin-orbit coupling (SOC) and the 
	broken inversion symmetry of its buckled monolayer structure\, PbS is found
	 to possess Rashba-Dirac cone with a relatively large Rashba parameter at Î
	“ and M point of λ~1eV/Ã… and λ~5eV/Ã…\, respectively\, which are compara
	ble to other giant Rashba materials (e.g BiTeBr). We develop a new tight-bi
	nding formulation to describe the band structure\, orbital texture\, and sp
	in texture. SOC mixes the out-of-plane and in-plane orbital components of a
	toms with same species while the inversion symmetry breaking (degree of buc
	kling) mixes the out-of-plane and in-plane orbitals of atoms with different
	 species. The latter can be controlled via applications of in-plane strains
	 allowing control of spin splitting and texture as well as Fermi velocity a
	t Γ and M. The novel property of PbX with unique and tunable orbital and s
	pin texture\, which has not been found before in free-standing two-dimensio
	nal materials\, opens a new way of utilizing two-dimensional materials for 
	next-generation electronic devices. Lastly\, based on our tight-binding res
	ults\, we will discuss the effect of external magnetic field and Landau lev
	els in Rashba-Dirac materials\n\n![Hanakata](/resources/event-image/1761/e3
	c4f9a_small)
LOCATION:SCI 352\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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