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SUMMARY:The effects of temperature on topological materials  - Bartomeu Mo
 nserrat (University of Cambridge)
DTSTART:20200423T140000Z
DTEND:20200423T150000Z
UID:TALK139519@talks.cam.ac.uk
CONTACT:Yonatan Calahorra
DESCRIPTION:Topological materials exhibit exotic properties such as dissip
 antionless charge and spin currents that could form the basis for novel te
 chnological applications such as low-power electronics or spintronics devi
 ces. However\, many topological materials lose their topological order upo
 n increasing temperature\, thus hampering practical applications.\n\nI wil
 l describe the interplay between topology and temperature\, showing that t
 hermal expansion and electron-phonon coupling contribute similarly to the 
 temperature dependence of the properties of topological materials. Using t
 he Bi2Se3 family of topological insulators as an example\, I will explain 
 why increasing temperature tends to destroy topological order. However\, I
  will argue that this is not a fundamental constraint on topological mater
 ials\, and I will show how it is also possible to design materials in whic
 h the opposite behaviour is observed\, presenting PbO2 as the first exampl
 e of a material in which temperature promotes a topologically ordered phas
 e. Finally\, I will discuss how temperature may be exploited to identify t
 he correct topological phase of a material\, an approach that will prove p
 articularly useful close to the boundary between two phases with different
  topological order.
LOCATION:Goldsmiths 1\, Lecture Theatre\, Department of Materials Science 
 &amp\; Metallurgy
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