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BEGIN:VEVENT
DTSTAMP:20260914T040036Z
LAST-MODIFIED:20200814T182052Z
DTSTART:20200709T163000Z
DTEND:20200709T173000Z
UID:event2347@bu.edu
URL:http://physics.bu.edu/internal/events/show/2347
SUMMARY:Pseudospin superconductivity in honeycomb superlattices
DESCRIPTION:Featuring Julian Ingham\, Boston University\nHosted by: Eric Bo
	yers\n\nPart of the Graduate Student Council Events.\n\nPart of the student
	 seminar series. A recording will be posted on the event page.\n\nAbstract:
	 Semiconductor artificial graphene (AG) seeks to replicate the properties o
	f graphene\, by subjecting a two-dimensional electron gas to a periodic pot
	ential with the same symmetries as the atomic lattice in graphene. I will e
	xplain how this material can realize a new mechanism for high temperature s
	uperconductivity — due to the antiscreened fluctuations of the emergent p
	seudospin degree of freedom. The Berry phase of the Dirac fermion causes de
	structive interference between states with opposite momenta\, leading to th
	e novel effect whereby electrons can partially avoid the Coulomb repulsion 
	by forming Cooper pairs. This gives rise to an effective attraction between
	 Cooper pairs\, which is enhanced by doping due to an antiscreening effect\
	, eventually leading to superconductivity. This mechanism originates solely
	 from the repulsive Coulomb interaction\, and relies on a strong periodic p
	otential and the topological properties of the Dirac dispersion — and cou
	ld therefore in principle be realized in other Dirac materials. The ability
	 to artificially tune the lattice spacing\, potential strength and density 
	in AG allows this regime to be engineered\, and the calculations I present 
	show that Tc can be order 25 K for realistic experimental parameters.
LOCATION: \, \, 
STATUS:CONFIRMED
CLASS:PUBLIC
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