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SUMMARY:The piezoaxionic effect - Prof. Asimina Arvanitaki\, Perimeter Ins
 titute
DTSTART:20220316T141500Z
DTEND:20220316T151500Z
UID:TALK170012@talks.cam.ac.uk
CONTACT:Bipasha Chakraborty
DESCRIPTION:Axion dark matter (DM) constitutes an oscillating background t
 hat violates parity and time-reversal symmtries. Inside piezoelectric crys
 tals\, where parity is broken spontaneously\, this axion background can re
 sult in a stress. We call this new phenomenon "the piezoaxionic effect". W
 hen the frequency of axion DM matches the natural frequency of a bulk acou
 stic normal mode of the piezoelectric crystal\, the piezoaxionic effect is
  resonantly enhanced and can be read out electrically via the piezoelectri
 c effect. We explore all axion couplings that can give rise to the piezoax
 ionic effect -- the most promising one is the defining coupling of the QCD
  axion\, through the anomaly of the strong sector. We also point our anoth
 er\, subdominant phenomenon present in all dielectrics\, namely the "elect
 roaxionic effect". An axion background can produce an electric displacemen
 t field in a crystal which in turn will give rise to a voltage across the 
 crystal. The electroaxionic effect is again largest for the axion coupling
  to gluons. We find that this model independent coupling of the QCD axion 
 may be probed through the combination of the piezoaxionic and electroaxion
 ic effects in piezoelectric crystals with aligned nuclear spins\, with nea
 r-future experimental setups applicable for axion masses between 10^−11^
  eV and 10^−7^ eV\, a challenging range for most other detection concept
 s.
LOCATION:Online (link to be shared in email)
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