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DTSTAMP:20260424T143505Z
UID:1696928400@ist.ac.at
DTSTART:20231010T110000
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DESCRIPTION:Speaker: Brad Ramshaw\nhosted by Kim Modic\nAbstract: Supercond
 uctors come in many varieties: we typically classify them based on the sym
 metry of their superconducting gap\, such as s\, p\, or d-wave. This class
 ification\, however\, does not tell the entire story because the supercond
 ucting gap can also have topological structure. One route to topological s
 uperconductivity is to find a superconductor with a multi-component order 
 parameter\, such as the famed px + i py state in 3He. Multi-component orde
 r parameters can have "twists" in momentum space\, forming a topological s
 uperconducting state. Finding such a superconductor\, however\, has proven
  challenging\, in part due to the lack of experimental tools available. I 
 will discuss how we use ultrasound to measure the strain susceptibility of
  the superconducting gap. By comparing the shear and compression susceptib
 ilities\, we can distinguish between one-component and multi-component sup
 erconductors. I will discuss our surprising discovery that Sr2RuO4 may har
 bour a unique\, multi-component state\, despite px + i py being ruled out 
 by NMR. I will then show new data on UTe2\, which has been claimed to have
  a multi-component order parameter that gives rise to two superconducting 
 transitions and time reversal symmetry breaking. By performing ultrasound 
 on samples of UTe2 with both one and two superconducting transitions\, we 
 clarify the nature of the superconducting state and are able to make crisp
 \, symmetry-based statements about the potential multi-component gap.
LOCATION:Office Bldg West / Ground floor / Heinzel Seminar Room (I21.EG.101
 )\, ISTA
ORGANIZER:Darina.Boukalova@ist.ac.at
SUMMARY:Brad Ramshaw: Quantum Colloquium (Title: Searching for topological 
 superconductors using ultrasound)
URL:https://talks-calendar.ista.ac.at/events/4439
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