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BEGIN:VEVENT
DTSTAMP:20260914T033509Z
LAST-MODIFIED:20191017T195325Z
DTSTART:20191023T193000Z
DTEND:20191023T203000Z
UID:event2210@bu.edu
URL:http://physics.bu.edu/internal/events/show/2210
SUMMARY:Bosonization and the Shear Sound of Metals and The Non-linear Hall 
	Effect in Time-Reversal-Invariant Materials
DESCRIPTION:Featuring Inti Sodemann\, Max Planck Institute for the Physics 
	of Complex Systems\nHosted by: Claudio Chamon\n\nPart of the Condensed Matt
	er Theory Seminar Series.\n\nIn the first part of the talk\, we will review
	 the bosonization approach to Fermi liquids in above one dimension and use 
	it to study a sharp change in the excitation spectrum of fermi liquids that
	 occurs beyond a critical interaction strength whereby an unconventional co
	llective mode exits the particle-hole continuum. This mode is a collective 
	shear wave that features purely transverse current oscillations\, in analog
	y to the transverse sound of crystals. We will argue that the shear sound m
	ight be "hiding`' in several metals and describe experimental strategies to
	 probe it\, including the appearance of sharp conductivity dips in ultra-cl
	ean narrow channels and its coupling to charge-fluctuations under weak magn
	etic fields.\n\nIn the second part\, we will describe a correction to Newto
	n’s second law when electrons move in Bloch bands without inversion symme
	try\, whereby\, their acceleration acquires a term proportional to the squa
	re of the electric field and orthogonal to it. This "non-linear Hall accele
	ration"\ngives rise to a "non-linear Hall effect" in time reversal invarian
	t materials that is controlled by a quantum geometric tensor called the "Be
	rry curvature dipole". We will also discuss a remarkable "quantum rectifica
	tion sum rule" according to which the frequency integrated rectification co
	nductivity is entirely controlled by the Berry geometry and is independent 
	of the band energies.
LOCATION:SCI 328\, 590 Commonwealth Avenue\, 02215
STATUS:CONFIRMED
CLASS:PUBLIC
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