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SUMMARY:IMX Seminar Series - Understanding electronic transport through lo
 cal magnetic measurements
DTSTART:20240318T131500
DTEND:20240318T141500
DTSTAMP:20260510T105840Z
UID:af423a3268d6ec256ce2d02e9b2848160b87706265a6d14bf37aa2f9
CATEGORIES:Conferences - Seminars
DESCRIPTION:Prof. Katja Nowack\, Cornell University\, Ithaca USA\nElectric
  charge can flow in unexpected ways through a sample\, in particular in di
 ssipationless conductors. In this talk\, I will discuss how we use a local
  magnetic probe to visualize electronic transport in two different types o
 f dissipationless conductors. First\, we study microstructures fabricated 
 from a heavy-fermion superconductor that exhibit an unusual resistive supe
 rconducting transition. We show that this behavior is explained by a spati
 ally modulated transition temperature\, and we discover that local strain 
 is the cause of the spatial modulation. Second\, we visualize how a non-eq
 uilibrium current flows in a quantum anomalous Hall insulator by imaging t
 he magnetic field produced by the current. Against the prevalent expectati
 on that the transport current is concentrated along the edges\, we find th
 at the current can flow in the interior of the sample within the dissipati
 onless regime.\n\nLinks to most relevant papers\nhttps://www.nature.com/ar
 ticles/s41563-023-01622-0\nhttps://www.science.org/doi/full/10.1126/scienc
 e.aao6640\n\nBio: Katja Nowack received her Ph.D. in Physics from Delft Un
 iversity of Technology in 2009\, after\ncompleting a “Diplom” in Physi
 cs at RWTH Aachen in Germany.  Her PhD work in Lieven Vandersypen’s gro
 up focused on the control and read-out of single spins in gate-defined GaA
 s quantum dots motivated by prospects of spin-based quantum information pr
 ocessing. In 2011 after a short postdoc in Delft\, she joined Kathryn Mole
 r’s group at Stanford as a postdoctoral researcher. There she pivoted to
  scanning probe microscopy and developed an interest in quantum materials.
  In 2015\, she started her own research group at Cornell University focusi
 ng on magnetic imaging. Her lab has a broad set of activities ranging from
  exploring unconventional superconductors\, probing magnetic signatures of
  emergent phenomena to more applied topics such as developing new sensors 
 for imaging and characterizing flux trapping relevant to structures of sup
 erconducting digital circuits.\n 
LOCATION:https://epfl.zoom.us/j/69966497404
STATUS:CONFIRMED
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