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DESCRIPTION:Title: Helicity Inference and Control in Magnetic Architectures
  for Quantum Computation\n\nAbstract: In non-collinear spin textures such 
 as magnetic skyrmions\, the helicity −𝜋 < 𝜑0 ≤ 𝜋 describes th
 e orientation of the local spin rotation axis relative to the helical wave
 vector. The value of 𝜑0 influences the dynamics of skyrmions\, as well 
 as their interplay with external electromagnetic fields and ordered states
 . In particular\, the Rashba-Edelstein interaction between a skyrmion and 
 a vortex in a proximate superconductor is suppressed for 𝜑0 = ±𝜋/2 
 [1]\, thus raising the possibility of creating a hybrid topological solito
 n whose stability is governed by 𝜑0.\n\nMotivated by the prospect of bu
 ilding a two-dimensional topological superconducting platform with control
 lable vortices [2\,3]\, I will present evidence for helicity switching at 
 superconductor/chiral magnet interfaces\, driven by competition between di
 polar and Dzyaloshinskii-Moriya (DMI) interactions. Magnetic force microsc
 opy can also reveal the impact of helicity on skyrmion-vortex coupling\, i
 llustrated by our observed amplification of Néel 𝜋 skyrmion radii when
  covered by a superconductor. Finally\, I will consider centrosymmetric sk
 yrmion crystals\, where – in contrast with interfacial systems – the l
 ack of any global DMI creates a near-degenerate helicity landscape\, tunab
 le by electric fields and currents. I will discuss possible techniques for
  local helicity control in these materials\, with applications in both top
 ological and analog quantum computing [4].\n\n[1] K. M. D. Hals\, M. Schec
 ter\, and M. S. Rudner\, Phys. Rev. Lett. 117\, 017001 (2016).\n[2] S. Rex
 \, I. V. Gornyi\, and A. D. Mirlin\, Phys. Rev. B 100\, 064504 (2019).\n[3
 ] A. P. Petrović et al.\, Phys. Rev. Lett. 126\, 117205 (2021).\n[4] A. P
 . Petrović\, et al.\, Rev. Mod. Phys. 97\, 031001 (2025).\n\nCo-sponsored
  by: UCCS Department of Physics and Energy Science\n\nSpeaker(s): Alex\, \
 n\nRoom: A204\, Bldg: Osborn Cenrer \, 1420 Austin Bluffs Pkwy\, Colorado 
 Springs\, Colorado\, United States\, 80918
LOCATION:Room: A204\, Bldg: Osborn Cenrer \, 1420 Austin Bluffs Pkwy\, Colo
 rado Springs\, Colorado\, United States\, 80918
ORGANIZER:jbrock8@uccs.edu
SEQUENCE:12
SUMMARY:Alex Petrovic Seminar
URL;VALUE=URI:https://events.vtools.ieee.org/m/537406
X-ALT-DESC:Description: <br /><p><strong>Title</strong>: Helicity Inference
  and Control in Magnetic Architectures for Quantum Computation</p>\n<p cla
 ss="elementToProof"><strong>Abstract</strong>: In non-collinear spin textu
 res such as magnetic skyrmions\, the helicity &minus\;𝜋&nbsp\;&lt\; 
 𝜑0 &le\; 𝜋 describes the orientation of the local spin rotation axis
  relative to the helical wavevector. The value of 𝜑0 influences the dyn
 amics of skyrmions\, as well as their interplay with external electromagne
 tic fields and ordered states. In particular\, the Rashba-Edelstein intera
 ction between a skyrmion and a vortex in a proximate superconductor is sup
 pressed for 𝜑0 = &plusmn\;𝜋/2 [1]\, thus raising the possibility of 
 creating a hybrid topological soliton whose stability is governed by 𝜑0
 .</p>\n<div class="elementToProof">&nbsp\;</div>\n<div class="elementToPro
 of">Motivated by the prospect of building a two-dimensional topological su
 perconducting platform with controllable vortices [2\,3]\, I will present 
 evidence for helicity switching at superconductor/chiral magnet interfaces
 \, driven by competition between dipolar and Dzyaloshinskii-Moriya (DMI) i
 nteractions. Magnetic force microscopy can also reveal the impact of helic
 ity on skyrmion-vortex coupling\, illustrated by our observed amplificatio
 n of N&eacute\;el 𝜋 skyrmion radii when covered by a superconductor. Fi
 nally\, I will consider centrosymmetric skyrmion crystals\, where &ndash\;
  in contrast with interfacial systems &ndash\; the lack of any global DMI 
 creates a near-degenerate helicity landscape\, tunable by electric fields 
 and currents. I will discuss possible techniques for local helicity contro
 l in these materials\, with applications in both topological and analog qu
 antum computing [4].</div>\n<div class="elementToProof">&nbsp\;</div>\n<di
 v class="elementToProof">[1] K. M. D. Hals\, M. Schecter\, and M. S. Rudne
 r\, Phys. Rev. Lett. <strong>117</strong>\, 017001 (2016).</div>\n<div cla
 ss="elementToProof">[2] S. Rex\, I. V. Gornyi\, and A. D. Mirlin\, Phys. R
 ev. B <strong>100</strong>\, 064504 (2019).</div>\n<div class="elementToPr
 oof">[3] A. P. Petrović et al.\, Phys. Rev. Lett. <strong>126</strong>\, 
 117205 (2021).</div>\n<div class="elementToProof">[4] A. P. Petrović\, et
  al.\, Rev. Mod. Phys. <strong>97</strong>\, 031001 (2025).</div>
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