[Todos] CHARLA IFLYSIB - Viernes 21/102/2025, 10:30 h - "Why does the valence bond solid start exactly where the ordered antiferromagnet stops?"

[Charlas IFLYSIB]

*Los esperamos con café 15 minutos antes de la charla en el lobby del
instituto*.

*Charla  IFLYSIB*
*Viernes 21/02/2025, 10:30 h*
*Lugar: IFLySiB (59 #789 e/10 y 11, La Plata)*

*La charla será presencial y su grabación será subida luego a nuestro canal
de YouTube <https://www.youtube.com/@charlasiflysib8383>.*

*Título:*
*Why does the valence bond solid start exactly where the ordered
antiferromagnet stops?*

*Expositor:*

*Chris Hooley - Centre for Fluid and Complex Systems, Coventry University,
U.K.*


*Resumen*:

*Suppose I take an ordered antiferromagnet, and change the magnetic field
or the exchange interactions to provoke a phase transition from long-range
antiferromagnetic order to a quantum short-range-ordered state such as a
valence bond crystal.  The symmetry properties of those two phases are
completely different: the antiferromagnet breaks spin-rotation symmetry,
while the valence bond crystal breaks only lattice translation symmetry.
However, as soon as the antiferromagnetism goes away, the valence bond
crystal order appears.  Why?*



*In this talk, I shall explain our current (since approx. 20 years ago)
understanding of the answer to that question, based on a collection of
ideas that goes by the name of “deconfined quantum criticality”.  I shall
then briefly describe some recent work that my collaborators and I have
been doing to describe this kind of phase transition in a more unified
theoretical framework than has been available to date.*




-- 
*Comisión ChIFLy*
______________________________________________

Si no tenés interés en recibir los avisos de las chiflys, escribinos.
------------ próxima parte ------------
Se ha borrado un adjunto en formato HTML...
URL: <http://mail.fisica.unlp.edu.ar/pipermail/todos/attachments/20250217/dccdc707/attachment.html>