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SUMMARY:Non-conservative forces in nanoscale conductors - Tchavdar Todorov
 \, Queen's University Belfast
DTSTART:20210603T130000Z
DTEND:20210603T140000Z
UID:TALK159946@talks.cam.ac.uk
CONTACT:Edgar Engel
DESCRIPTION:Over ten years ago our group showed that interatomic forces un
 der current flow in nanostructures are non-conservative even under ideal s
 teady-state conditions. In other words\, the forces on atoms under current
  are not given by the gradient of a potential\, opening up the questions o
 f what the motion of atoms under these conditions looks like and what it c
 an and cannot do. Other researchers world-wide have joined this area\, wit
 h a number of new ideas and advances. \nThis talk will summarise our resea
 rch on this problem\, both in the past and at present. In the past we have
  investigated the resultant atomic dynamics in a variety of systems\, reve
 aling a generic effect: the continuous supply of kinetic energy to the ato
 mic motion by the work done by the non-conservative forces\, which we have
  called the waterwheel effect. This effect can be seen both as a construct
 ive aspect of the current-driven dynamics opening up the possibility of at
 omic-scale manipulation\, and as a destructive agent limiting the stabilit
 y of nanoscale conductors over and above Joule heating. Most recently we h
 ave started to investigate the influence of electron-electron interactions
  on the waterwheel effect\, with some interesting preliminary findings.
LOCATION:Details of video conferencing will be distributed nearer the time
 .
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