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DTSTAMP:20260424T143230Z
UID:1658232000@ist.ac.at
DTSTART:20220719T140000
DTEND:20220719T150000
DESCRIPTION:Speaker: Volker Karle\, Areg Ghazaryan\, Mikhail Lemeshko\nhost
 ed by Maksym Serbyn\nAbstract: Multiband topological phases of periodicall
 y kicked moleculesVolker Karle\, Areg Ghazaryan\, Mikhail LemeshkoIn this 
 seminar Volker Karle will present our recent theoretical work on kicked m
 olecules. We show that the simplest of existing molecules -- closed-shell 
 diatomics not interacting with one another -- host topologically nontrivia
 l phases when driven by periodic far-off-resonant laser pulses. A periodic
 ally kicked molecular rotor can be mapped onto a "crystalline" lattice in 
 angular momentum space. This allows to define quasimomenta and the band st
 ructure in the Floquet representation\, by analogy with the Bloch waves of
  solid-state physics. Applying laser pulses spaced by 1/3 of the molecular
  rotational period creates a lattice with three atoms per unit cell with s
 taggered hopping\, whose band structure features Dirac cones. These Dirac 
 cones\, topologically protected by reflection and time-reversal symmetry\,
  are reminiscent of (although not equivalent to) the ones seen in graphene
 . They -- and the corresponding edge states -- are broadly tunable by adju
 sting the laser intensities and can be observed in present-day experiments
  by measuring molecular alignment and populations of rotational levels. Th
 is paves the way to study controllable topological physics in gas-phase ex
 periments with small molecules as well as to classify dynamical molecular 
 states by their topological invariants.
LOCATION:Mondi 3\, ISTA
ORGANIZER:
SUMMARY:Volker Karle\, Areg Ghazaryan\, Mikhail Lemeshko: Multiband topolog
 ical phases of periodically kicked molecules
URL:https://talks-calendar.ista.ac.at/events/3871
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