New paper published – Chiral Spin Mode on the Surface of a Topological Insulator

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Authors: H.-H. Kung, S. Maiti, X. Wang, S.-W. Cheong, D.L. Maslov, G. Blumberg Abstract: Using polarization-resolved resonant Raman spectroscopy, we explore collective spin excitations of the chiral surface states in a three dimensional topological insulator, Bi2Se3. We observe a sharp peak at 150 meV in the pseudovector A2 symmetry channel of the Raman spectra. By …

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Congradulations to Mai Ye and Other Group Members for their Departmental Awards

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We are proud to announce that graduate student Mai Ye has been awarded the David C. Langreth Graduate Development Award. This awarded is awarded to “promising early-stage graduate student, typically in the second year of graduate study, providing travel and living expenses for use in attending a scientific summer school or tutorial workshop in condensed matter …

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Viktor receives Goldwater Scholarship

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An undergraduate student member of this lab, Viktor Krapivin, has been awarded the Goldwater Scholarship! Congratulations to Viktor for winning this prestigious national award! You can read more about Viktor and this award here: http://news.rutgers.edu/news/rutgers-physics-and-math-major-honored-goldwater-scholarship/20170405 http://www.dailytargum.com/article/2017/04/physics-major-becomes-22nd-rutgers-student-to-earn-prestigious-goldwater-scholarship

Surface vibrational modes of the topological insulator Bi2Se3 observed by Raman spectroscopy

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Authors: H.-H. Kung, M. Salehi, I. Boulares, A.F. Kemper, N. Koirala, M. Brahlek, P. Lostak, C. Uher, R. Merlin, X. Wang, S.-W. Cheong, S. Oh, G. Blumberg Abstract: We present polarization resolved Raman scattering study of surface vibration modes in the topological insulator Bi2Se3 single crystal and thin films. Besides the 4 Raman active bulk …

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Superconductivity and electronic fluctuations in Ba_{1−x}K_{x}Fe_{2}As_{2} studied by Raman scattering

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Authors: S.-F. Wu, P. Richard, H. Ding, H.-H. Wen, Guotai Tan, Meng Wang, Chenglin Zhang, Pengcheng Dai, G. Blumberg Abstract: Using polarization-resolved electronic Raman scattering we study underdoped, optimally doped, and overdoped Ba1−xKxFe2As2 samples in the normal and superconducting states. We show that low-energy nematic fluctuations are universal for all studied doping ranges. In the …

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