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SUMMARY:Nonlinear Thouless pumping of solitons
DTSTART;VALUE=DATE-TIME:20260402T100000Z
DTEND;VALUE=DATE-TIME:20260402T120000Z
DTSTAMP;VALUE=DATE-TIME:20260418T173600Z
UID:indico-event-29249@indico.ihep.ac.cn
DESCRIPTION:Speakers: 禹良 陶\nTitle: Nonlinear Thouless pumping of sol
 itons\n\nAbstract: It has recently been theoretically predicted and experi
 mentally observed that a soliton resulting from nonlinearity can be pumped
  across an integer or fractional number of unit cells as a system paramete
 r is slowly varied over a pump period. Nonlinear Thouless pumping is now u
 nderstood as the flow of instantaneous Wannier functions\, ruling out the 
 possibility of pumping a soliton across a nonzero number of unit cells ove
 r one cycle when a corresponding Wannier function does not exhibit any flo
 w\, i.e.\, when the corresponding Bloch band that the soliton bifurcates f
 rom is topologically trivial. Here we surprisingly find an anomalous nonli
 near Thouless pump where the displacement of a soliton over one cycle diff
 ers from the Chern number of the Bloch band from which the soliton comes. 
 We develop a general theory showing that this anomalous behavior arises fr
 om a transition of a soliton between different Wannier functions by passin
 g through an intersite-soliton (or dipole soliton) state. Furthermore\, we
  find a nonlinearity-induced integer and fractional Thouless pump of a sol
 iton\, allowing a soliton to travel across an integer or fractional unit c
 ell during a pump period\, even when the corresponding band is topological
 ly trivial. Our results open the door to studying nonlinearity-induced Tho
 uless pumping of solitons.\n\n报告人：陶禹良(清华大学)\nhttps:/
 /indico.ihep.ac.cn/event/29249/
LOCATION:318 (数理楼)
URL:https://indico.ihep.ac.cn/event/29249/
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