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Costel R. Rotundu
Researcher at SLAC National Accelerator Laboratory
Publications - 80
Citations - 1585
Costel R. Rotundu is an academic researcher from SLAC National Accelerator Laboratory. The author has contributed to research in topics: Superconductivity & Topological insulator. The author has an hindex of 21, co-authored 77 publications receiving 1362 citations. Previous affiliations of Costel R. Rotundu include University of Maryland, College Park & Stanford University.
Papers
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Journal ArticleDOI
Photoelectron spin-flipping and texture manipulation in a topological insulator
Chris Jozwiak,Cheol-Hwan Park,Cheol-Hwan Park,Kenneth Gotlieb,Choongyu Hwang,Dung-Hai Lee,Dung-Hai Lee,Steven G. Louie,Steven G. Louie,Jonathan D. Denlinger,Costel R. Rotundu,Robert J. Birgeneau,Robert J. Birgeneau,Zahid Hussain,Alessandra Lanzara,Alessandra Lanzara +15 more
TL;DR: In a topological insulator, the surface-state electron spins are ‘locked’ to their direction of travel as mentioned in this paper. But when an electron is kicked out by a photon through the photoelectric effect, the spin polarization is not necessarily conserved.
Journal ArticleDOI
Three-dimensional collective charge excitations in electron-doped copper oxide superconductors
M. Hepting,L. Chaix,L. Chaix,Edwin W. Huang,Edwin W. Huang,R. Fumagalli,Yingying Peng,Yingying Peng,Brian Moritz,Kurt Kummer,N. B. Brookes,W. C. Lee,Makoto Hashimoto,Tarapada Sarkar,Junfeng He,Junfeng He,Costel R. Rotundu,Young S. Lee,Richard L. Greene,Lucio Braicovich,Lucio Braicovich,Giacomo Claudio Ghiringhelli,Zhi-Xun Shen,Thomas P. Devereaux,Wei-Sheng Lee +24 more
TL;DR: Resonant inelastic X-ray scattering on electron-doped copper oxide superconductors reveals a three-dimensional charge collective mode, which has properties suggestive of the long-sought acoustic plasmon.
Journal Article
Photoelectron spin-flipping and texture manipulation in a topological insulator
Chris Jozwiak,Cheol-Hwan Park,Kenneth Gotlieb,Choongyu Hwang,Dung-Hai Lee,Steven G. Louie,Jonathan D. Denlinger,Costel R. Rotundu,Robert J. Birgeneau,Zahid Hussain,Alessandra Lanzara +10 more
TL;DR: In a topological insulator, the surface-state electron spins are ‘locked’ to their direction of travel as mentioned in this paper. But when an electron is kicked out by a photon through the photoelectric effect, the spin polarization is not necessarily conserved.
Journal ArticleDOI
Widespread spin polarization effects in photoemission from topological insulators
Chris Jozwiak,Yulin Chen,Yulin Chen,Yulin Chen,Alexei V. Fedorov,James Analytis,James Analytis,Costel R. Rotundu,Andreas K. Schmid,Jonathan D. Denlinger,Yi-De Chuang,D.-H. Lee,D.-H. Lee,Ian R. Fisher,Ian R. Fisher,Robert J. Birgeneau,Robert J. Birgeneau,Zhi-Xun Shen,Zhi-Xun Shen,Zahid Hussain,Alessandra Lanzara,Alessandra Lanzara +21 more
TL;DR: In this article, high-resolution spin and angle-resolved photoemission spectroscopy (spin-ARPES) was performed on the three-dimensional topological insulator Bi2Se3 using a recently developed high-efficiency spectrometer.
Journal ArticleDOI
Spin-polarized surface resonances accompanying topological surface state formation.
Chris Jozwiak,Jonathan Sobota,Jonathan Sobota,Jonathan Sobota,Kenneth Gotlieb,Alexander F. Kemper,Costel R. Rotundu,Robert J. Birgeneau,Zahid Hussain,Dung-Hai Lee,Dung-Hai Lee,Zhi-Xun Shen,Zhi-Xun Shen,Alessandra Lanzara,Alessandra Lanzara +14 more
TL;DR: Calculations show these two distinct states can emerge from trivial Rashba-like states that change topology through the spin-orbit-induced band inversion, enabling a compelling view of the coevolution of surface states through a topological phase transition.