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BEGIN:VEVENT
DTSTAMP:20260910T084202Z
LAST-MODIFIED:20181010T134629Z
DTSTART:20181017T190000Z
DTEND:20181017T200000Z
UID:event2030@bu.edu
URL:http://physics.bu.edu/internal/events/show/2030
SUMMARY:Hierarchical Majoranas in a Programmable Nanowire Network
DESCRIPTION:Featuring Zhicheng Yang\, Boston University\, Physics Departmen
	t\nHosted by: Claudio Chamon\n\nPart of the Condensed Matter Theory Seminar
	 Series.\n\nWe propose a hierarchical architecture for building "logical" M
	ajorana zero modes using "physical" Majorana zero modes at the Y-junctions 
	of a hexagonal network of semiconductor nanowires. Each Y-junction contains
	 three "physical" Majoranas\, which hybridize when placed in close proximit
	y\, yielding a single effective Majorana mode near zero energy. The hybridi
	zation of effective Majorana modes on neighboring Y-junctions is controlled
	 by applied gate voltages on the links of the honeycomb network. This gives
	 rise to a tunable tight-binding model of effective Majorana modes. We show
	 that selecting the gate voltages that generate a Kekule vortex pattern in 
	the set of hybridization amplitudes yields an emergent "logical" Majorana z
	ero mode bound to the vortex core. The position of a logical Majorana can b
	e tuned adiabatically\, without moving any of the "physical" Majoranas or c
	losing any energy gaps\, by programming the values of the gate voltages to 
	change as functions of time. A nanowire network supporting multiple such "l
	ogical" Majorana zero modes provides a physical platform for performing adi
	abatic non-Abelian braiding operations in a fully controllable manner.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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