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SUMMARY:Coupled mechanical and electronic fields in graphene and their opt
 imization for nanomechanical devices - Dr Gareth Wyn Jones\, School of Mat
 hematics\, University of Manchester
DTSTART:20190222T140000Z
DTEND:20190222T150000Z
UID:TALK118708@talks.cam.ac.uk
CONTACT:Hilde Hambro
DESCRIPTION:Graphene\, an atomically-thin sheet of carbon atoms\, is elast
 ically stiff\, extremely flexible\, and has a number of exciting electroni
 c properties. Among these is the so-called pseudomagnetic field\, which ar
 ises when the sheet is stretched inhomogeneously and can be interpreted cl
 assically through the deflection of electrons’ paths as they traverse th
 e deformed crystal lattice.\n\nWhile these pseudomagnetic fields do not co
 rrespond to real magnetic fields\, their effect can be measured at hundred
 s of Tesla\, far beyond that of conventional magnets. As such this phenome
 non has been studied widely for potential use in nanodevices.\n\nIn this t
 alk I will discuss the origin of this field\, and its dependence on the st
 rain field in the graphene sheet. This then leads naturally to a constrain
 ed optimization problem\, where the control variables necessary to produce
  a pseudomagnetic field of a given pattern is sought. Two particular appli
 cations are discussed: graphene atop an undulating substrate\, where the c
 ontrol variables describe the elevation of the surface\; and a Corbino dev
 ice\, where the control variables describe an annular region of non-circul
 ar boundary which is pressurized to deform a superimposed graphene sheet.\
 n
LOCATION:Oatley Meeting Room
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