Girsh Blumberg

Viktor receives Goldwater Scholarship

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

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

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 …

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

Collective excitations of dynamic Fermi surface deformations in BaFe2(As0.5P0.5)2

Authors: S.-F. Wu, W.-L. Zhang, D. Hu, H.-H. Kung, A. Lee, H.-C. Mao, P.-C. Dai, H. Ding, P. Richard and G. Blumberg Abstract: We use electronic Raman scattering to study the low-energy excitations in BaFe2(As0.5P0.5)2 (Tc≈16 K) samples. In addition to a superconducting pair breaking peak (2Δ=6.7 meV) in the A1g channel with a linear …

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Stress-induced nematicity in EuFe2As2 studied by Raman spectroscopy

Authors: W.-L. Zhang, Athena S. Sefat, H. Ding, P. Richard, and G. Blumberg Abstract: We use polarized Raman scattering to study the structural phase transition in EuFe2As2, the parent compound of the 122-ferropnictide superconductors. The in-plane lattice anisotropy is characterized by measurements of the side surface with different strains induced by different preparation methods. We …

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Raman scattering study of spin-density-wave-induced anisotropic electronic properties in AFe2As2 ( A = Ca, Eu)

Authors: W.-L. Zhang, Z. P. Yin, A. Ignatov, Z. Bukowski, Janusz Karpinski, Athena S. Sefat, H. Ding, P. Richard, and G. Blumberg Abstract: We present a polarization-resolved and temperature-dependent Raman scattering study of AFe2As2(A=Ca,Eu). In the spin-density-wave phase, spectral weight redistribution is observed in the fully symmetric and nonsymmetric scattering channels at different energies. An …

Raman scattering study of spin-density-wave-induced anisotropic electronic properties in AFe2As2 ( A = Ca, Eu) Read More »