ELFT HÍRADÓ

[Janos Asboth <asboth.janos AT wigner.mta.hu>]

WIGNER SZFI SZEMINÁRIUMNIC SHANNON

(Okinawa Institute of Science and Technology, vendéglátó: Penc Karlo)
"Electromagnetism on Ice : from quantum spin ice to protons in water ice"

Időpont: 2016. január 5. (kedd) 10:00 (1 óra)
Hely: MTA Wigner FK SZFI, I. épület 1. emeleti Tanácsterem
Összefoglaló:

It has been known since the pioneering work of Bernal, Fowler and Pauling
that hexagonal water ice is the architype of a frustrated material : a
proton-bonded network in which protons satisfy strong local constraints -
the "ice rules" - but do not order.

Frustration of this type has been rediscovered many times since, in the
context of charge order on pyrochlore lattice, proton-bonded
ferroelectrics, models of polymer melts and, most famously, the family rare
earth pyrochlore oxides known as "spin ice" - prime examples of materials
with strong spin-orbit coupling.

Recently "quantum spin-ice" materials have attracted considerable attention
as potential hosts for a quantum spin-liquid, in which the collective
excitations of spins are described by a U(1) lattice gauge theory, and have
the character of photons.

In this talk we review some of the theoretical progress in understanding
quantum spin ice, with emphasis on recent numerical results, and pose the
question : should we be looking for a similar quantum liquid in the protons
of water ice?

[1] O. Benton, O. Sikora and N. Shannon, arXiv:1504.04158

*Részletes információ:* http://www.szfki.hu/seminar
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Asbóth János
szfi-seminar AT wigner.mta.hu