BEGIN:VCALENDAR
VERSION:2.0
PRODID:-//RLASKEY//CALENDEROUS//EN
CALSCALE:GREGORIAN
METHOD:PUBLISH
BEGIN:VEVENT
DTSTAMP:20260907T093047Z
LAST-MODIFIED:20141106T134041Z
DTSTART:20141120T160000Z
DTEND:20141120T170000Z
UID:event1353@bu.edu
URL:http://physics.bu.edu/internal/events/show/1353
SUMMARY:Disorder-induced phase transitions in multichannel Majorana wires
DESCRIPTION:Featuring Maria-Theresa Rieder\, Freie Universität Berlin\nHos
	ted by: Thomas Iadecola\n\nPart of the Condensed Matter Theory Seminar Seri
	es.\n\nAbstract: \nIn a 1D spinless p-wave superconductor\, disorder is kno
	wn to induce a phase transition between a topologically nontrivial phase an
	d a trivial insulating phase when the mean free path l becomes of the order
	 of the superconducting coherence length ξ. We show that a multichannel sp
	inless p-wave superconductor goes through a series of phase transitions the
	reby alternating between topologically trivial and nontrivial phases upon i
	ncreasing the disorder strength. The number of phase transitions equals the
	 channel number N and each phase transition is accompanied by a Dyson singu
	larity in the density of states ν(ε) ∝ ε^(-1) |lnε|^(−3). \nWe show
	 that this behavior is the result of an effective chiral symmetry allowing 
	us to analytically investigate the phase boundaries and density of states. 
	The last phase transition\, from a nontrivial phase into the trivial insula
	ting phase\, takes place at a mean free path l = ξ/(N+1)\, parametrically 
	smaller than the critical mean free path in one dimension. Away from the cr
	itical points\, the latter displays a power-law singularity ν(ε) ∝ ε^(
	|α|−1) for small energies ε. Using the concept of "superuniversality"\,
	 we relate the exponent α to the wire’s transport properties at zero ene
	rgy and\, hence\, to the mean free path and the superconducting coherence l
	ength.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
END:VEVENT
END:VCALENDAR