BEGIN:VCALENDAR
VERSION:2.0
PRODID:icalendar-ruby
CALSCALE:GREGORIAN
X-WR-CALNAME:MSE Seminar: Gregory Fuchs (Cornell AEP)
X-WR-TIMEZONE:Eastern Time (US & Canada)
BEGIN:VEVENT
DTSTAMP:20260809T070026Z
UID:tag:localist.com\,2008:EventInstance_48004389837495
DTSTART:20241114T210000Z
DTEND:20241114T220000Z
DESCRIPTION:Quantum Information Science with Spins\, Photons\, Magnons\, an
 d Superconductors\n\nIn this seminar I’ll discuss two recent experiments
  that explore new quantum platforms based on spins\, magnons\, and superco
 nductors\, each with eye toward future integration. The search for “quan
 tum defects” in new material systems has been motivated by the success o
 f the diamond nitrogen-vacancy (NV) center as a platform for quantum sensi
 ng and networking\, while realizing that NV centers have both strengths an
 d shortcomings. While diamond itself is an excellent material host for qua
 ntum defects\, it is not a mature semiconductor platform\, and it lacks we
 ll-established doping and fabrication technologies. Here we examine bright
  individual defect centers in GaN and find two distinct defect species [1]
 . In the first\, we find a room temperature ODMR contrast of ~5% and ident
 ify that the associated S ≥ 1. In the second\, we find a large room temp
 erature ODMR contrast of up to ~30% that is associated with an S ≥ 3/2. 
 We characterize the defect symmetry axis and spin Hamiltonian of each defe
 ct\, which provides clues as to the structure of these defects. Although t
 he nuclear spin bath provided by the GaN host leads to a larger spin trans
 ition linewidth than e.g. NV centers in diamond\, the maturity of the host
  semiconductor and the brightness of the defects makes this system interes
 ting for quantum sensors integrated with electronics in a mature semicondu
 ctor host. Next\, I’ll discuss recent experiments in which we hybridize 
 superconducting resonator photons and magnons hosted by the organic ferrim
 agnet vanadium tetracyanoethylene (V[TCNE]x) [2]. This work is motivated b
 y the challenge of scalably integrating an arbitrarily-shaped\, low-dampin
 g magnetic system with planar superconducting circuits\, thus enabling a n
 ew class of quantum magnonic circuit designs. We take advantage of the pro
 perties of V[TCNE]x\, which has ultra-low intrinsic damping\, can be grown
  at low processing temperatures on arbitrary substrates\, and can be patte
 rned via electron beam lithography. We demonstrate the scalable\, lithogra
 phically integrated fabrication of hybrid quantum magnonic devices consist
 ing of a thin-film superconducting resonator coupled to a low-damping\, th
 in-film V[TCNE]x microstructure. Our devices operate in the strong couplin
 g regime\, with a cooperativity as high as 1181(44) at T~0.4 K\, suitable 
 for scalable quantum circuit integration. I’ll conclude with a perspecti
 ve on how low-damping magnetic excitations can add value in superconductin
 g quantum technologies.\n\n[1] J. Luo\, Y. Geng\, F. Rana\, and G. D. Fuch
 s\, “Room temperature optically detected magnetic resonance of single sp
 ins in GaN.” Nat. Maters. 23\, 512-518 (2024).\n[2] Q. Xu\, H. F. H. Che
 ung\, D. S. Cormode\, T. O. Puel\, S. Pal\, H. Yusuf\, M. Chilcote\, M. E.
  Flatté\, E. Johnston-Halperin\, and G. D. Fuchs\, “Strong photon-magno
 n coupling using a lithographically defined organic ferrimagnet\,” Adv. 
 Sci. 11\, 2310032 (2024).\n \n\nBio:\nGreg Fuchs earned his Ph.D. in appli
 ed physics from Cornell University in 2007. Afterward\, he moved to the Un
 iversity of California\, Santa Barbara as a postdoctoral associate. In 201
 1\, he joined the Cornell faculty of the Department of Applied and Enginee
 ring Physics. His group straddles the intersection of magnetism and quantu
 m information science with a focus on materials\, devices\, and characteri
 zation.
LOCATION:\, B11
SUMMARY:MSE Seminar: Gregory Fuchs (Cornell AEP)
URL;VALUE=URI:https://events.cornell.edu/event/mse-seminar-gregory-fuchs-co
 rnell-aep
CATEGORIES:Seminar
END:VEVENT
END:VCALENDAR