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UID:cc191a8106cb5836c40c12bc11b5c5a5
DTSTAMP:20260703T181855Z
SUMMARY:Magnons as a non-equilibrium probe and resource in quantum Hall sys
 tems
DESCRIPTION:I will present recent work on magnon-skyrmion crystal scatterin
 g in quantum Hall heterojunctions\, which establish these neutral collecti
 ve excitations of the quantum Hall ferromagnet\, as a new probe for topolo
 gy in such systems. In doing so\,  I will first review a series of pionee
 ring experiments which allow for the emission and detection of such magnon
 s in a scattering experiment setup. Then\, I will explain a theoretical fr
 amework [1] to extract magnon scattering signatures for a skyrmion crystal
  – a Wigner crystal where the charged particles have an associated topol
 ogical invariant. This work will highlight how magnon diffraction can serv
 e as an analogue for Bragg scattering\, in such crystals. Finally\, I wil
 l discuss work from a recent theory-experiment collaboration [2]\, which e
 xplores such scattering but in a different limit\, where the magnons can b
 e treated as particles\, and their interaction with skyrmions can be thoug
 ht of simplistically as Rutherford-type scattering. In this “geometric o
 ptics” limit\, I will present the back-action of magnons on a linear arr
 ay of confined skyrmions as an explanation for sharp and narrow windows of
  noise in the magnon detectors. I will also highlight the dipole nature of
  such magnons in quantum Hall ferromagnets and explore their dynamics in p
 resence of a confining potential. I will end with a discussion on future u
 se-cases of such quantum Hall magnons as a spin-valley entanglement witnes
 s\, to detect complex internal entanglement patterns in multi-component sk
 yrmion crystals [3]\, and also potentially as a resource for non-equilibri
 um exploration in the quantum Hall paradigm.\n\n[1] N. Chakraborty\, R. Mo
 essner and B. Doucot:  Physical Review B 112 (15)\, 155111\n[2] R. Ayach
 e*\, N. Chakraborty* et. al: https://www.researchsquare.com/article/rs-834
 3376/v1\n[3] N. Chakraborty\, R. Moessner and B. Doucot: Physical Review L
 etters 133 (20)\, 206604
URL:https://www.imperial.ac.uk/events/211260/magnons-as-a-non-equilibrium-p
 robe-and-resource-in-quantum-hall-systems/
DTSTART;TZID=Europe/London:20260702T140000
DTEND;TZID=Europe/London:20260702T150000
LOCATION:539\, Blackett Building\, South Kensington Campus\, Imperial Colle
 ge London\, London\, SW7 2AZ\, United Kingdom
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