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DTSTAMP:20240328T163006Z
UID:https://www.mpsd.mpg.de/events/18927/2724
DTSTART:20190611T090000Z
DTEND:20190611T100000Z
CLASS:PUBLIC
CREATED:20190604T111923Z
DESCRIPTION: “Quantum materials” loosely defines a broad collection of
materials whose ground states are defined by unusual quantum properties. T
his research largely focuses on macroscopic single crystals\, yet naturall
y interesting quantum phenomena lie beyond their equilibrium state. My gro
up works towards reducing the sample size onto the sub-mm length scale\, f
ollowing the general idea that small samples can be driven more strongly a
nd react faster than on the macro scale. Our main tool is Focused Ion Beam
machining capable of cutting single crystals into high quality quantum de
vices. I will present two concrete research projects showcasing how new qu
antum states out of equilibrium can be accessed and investigated in FIB-pr
epared microcrystal structures. The first concerns the heavy fermion super
conductor\, CeIrIn5 (Tc~400mK). When a mm-sized structure is fi
rmly coupled to a mm-sized substrate of different thermal expansion\, the
microstructure is under significant strain at low temperatures. By precise
ly controlling its shape\, the emergent strain field can be controlled. Th
e key difference to other approaches\, such as uniaxial strain\, is that c
omplex\, yet well-controlled\, spatially varying strain fields can be achi
eved. In collaboration with Katja Nowack (Cornell)\, we have experimentall
y mapped out the resulting superconducting landscape in the devices using
scanning-SQUID microscopy\, and show that this spatial modulation can be w
ell captured by finite element simulations. [1] Second\, I will present ou
r ongoing efforts to experimentally identify pseudo-magnetic fields in 3D
Dirac semi-metals [2\,3]. Owing to their Dirac dispersion\, deformation of
the crystal structure does not open a gap at the nodes\, but shifts the l
ocation of the nodes in k-space and hence playing the role of a “pseudo-
magnetic field”\, B5. I will show how microstructuring gives
us unprecedented control of such a process\, and discuss how future.\nVort
ragende(r): Philip Moll
LAST-MODIFIED:20190604T113619Z
LOCATION:CFEL (Bldg. 99)\, Raum: Seminar Room IV\, O1.111
ORGANIZER:Andrea Cavalleri
SUMMARY:MPSD Seminar: Tuning quantum materials out of equilibrium: A FIB-m
icrostructuring approach
URL:https://www.mpsd.mpg.de/events/18927/2724
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