Biography:
Keith Taddei joined the APS in 2023 as an Instrument Scientist on the 11-ID-D beamline. Previously, he worked as an Instrument Scientist on the POWDER and WAND2 neutron diffractometers of the HFIR at ORNL where he studied the structure and magnetism of quantum materials. He helped lead instrument upgrade designs and the development of ultra-low-temperature capabilities.
"Gapless spin excitations in the superconducting state of a quasi-one-dimensional spin-triplet superconductor" K.M. Taddei, B.-H. Lei, M.A. Susner, H.-F. Zhai, T.J. Bullard, L.D. Sanjeewa, Q. Zhen, A.S. Sefat, S. Chi, C. dela Cruz, D.J. Singh, B. Lv, Phys. Rev. B 107, L180504 (2023)
"Zigzag magnetic order and possible Kitaev interactions in the spin-1 honeycomb lattice KNiAsO4" K.M. Taddei, V.O. Garlea, A.M. Samarakoon, L.D. Sanjeewa, J. Xing, T.W. Heitmann, C. dela Cruz, A.S. Sefat, D. Parker, Phys. Rev. Research 5, 013022 (2023)
"Single pair of Weyl nodes in the spin-canted structure of
EuCd2As2" K.M. Taddei, L. Yin, L.D. Sanjeewa, Y. Li, J. Xing, C. dela Cruz, D. Phelan, A.S. Sefat, D.S. Parker, Phys. Rev. B 105, L140401 (2022)
"Stripe antiferromagnetic ground state of the ideal triangular lattice compound KErSe2" J. Xing, K.M. Taddei, L.D. Sanjeewa, R.S. Fishman, M. Daum, M. Mourigal, C. dela Cruz, A.S. Sefat, Phys. Rev. b 103, 144413 (2021)
"Evidence of Ba-substitution induced spin-canting in the magnetic Weyl semimetal EuCd2As2" L.D. Sanjeewa, J. Xing, K.M.Taddei, D. Parker, R. Custelcean, C. dela Cruz, A.S. Sefat, Phys. Rev. B 102, 104404 (2020)
"Tunable magnetic order in low-symmetry SeO3 ligand linked TM3(SeO3)3H2O (TM=Mn, Co, and Ni) compounds" K.M. Taddei, L.D. Sanjeewa, J. Xing, Q. Zhang, D. Parker, A. Podlesnyak, C. dela Cruz, A.S. Sefat, PHys. Rev. Materials 4, 024410 (2020)
"Tuning from frustrated magnetism to superconductivity in quasi-one-dimensional KCr3As3 through hydrogen doping" K.M. Taddei, L.D. Sanjeewa, B.-H. Lei, Y. Fu, Q. Zheng, D.J. Singh, A.S. Sefat, C. dela Cruz, Phys. Rev. B 100, 220503(R) (2019)
"Local-Ising-type magnetic order and metamagnetism in the rare-earth pyrogermanate Er2Ge2O7" K.M. Taddei, L. Sanjeewa, J.W. Kolis, A.S. Sefat, C. dela Cruz, D.M. Pajerowski, Phys. Rev. Materials 3, 014405 (2019)
"Frustrated Structural Instability in Superconducting Quasi-One-Dimensional K2Cr3As3" K.M. Taddei, G. Xing, J. Sun, Y. Fu, Q. Zheng, A.S. Sefat, D.J. Singh, C. dela Cruz, PHys. Rev. Lett. 121, 187002 (2018)
Symmetry protected topological phases
Long range entangled states
Unconventional superconductors
Out-of-equilibrium pump-probe techniques
Dr. Taddei received his Ph.D. in physics from Northern Illinois University. For his dissertation work he was awarded a Dissertation Completion Fellowship, recognized as a 2016 Outstanding Graduate Student in Physics, and awarded the 2015 Margaret Etter Award by the American Crystallographic Association. He received his B.S. in Physics from Lewis University.
