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CATEGORIES:Theoretical Physics Colloquium
SUMMARY:The piezoaxionic effect - Prof. Asimina Arvanitaki
 \, Perimeter Institute
DTSTART;TZID=Europe/London:20220316T141500
DTEND;TZID=Europe/London:20220316T151500
UID:TALK170012AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/170012
DESCRIPTION:Axion dark matter (DM) constitutes an oscillating 
 background that violates parity and time-reversal 
 symmtries. Inside piezoelectric crystals\, where p
 arity is broken spontaneously\, this axion backgro
 und can result in a stress. We call this new pheno
 menon "the piezoaxionic effect". When the frequenc
 y of axion DM matches the natural frequency of a b
 ulk acoustic normal mode of the piezoelectric crys
 tal\, the piezoaxionic effect is resonantly enhanc
 ed and can be read out electrically via the piezoe
 lectric effect. We explore all axion couplings tha
 t can give rise to the piezoaxionic effect -- the 
 most promising one is the defining coupling of the
  QCD axion\, through the anomaly of the strong sec
 tor. We also point our another\, subdominant pheno
 menon present in all dielectrics\, namely the "ele
 ctroaxionic effect". An axion background can produ
 ce an electric displacement field in a crystal whi
 ch in turn will give rise to a voltage across the 
 crystal. The electroaxionic effect is again larges
 t for the axion coupling to gluons. We find that t
 his model independent coupling of the QCD axion ma
 y be probed through the combination of the piezoax
 ionic and electroaxionic effects in piezoelectric 
 crystals with aligned nuclear spins\, with near-fu
 ture experimental setups applicable for axion mass
 es between 10^−11^ eV and 10^−7^ eV\, a challengin
 g range for most other detection concepts.
LOCATION:Online (link to be shared in email)
CONTACT:Bipasha Chakraborty
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