Research Update:Anisotropy of Kondo-lattice coherence in momentum space for CeCoIn5
We study the electronic and phononic excitations of heavy-fermion metal CeCoIn5 by polarization- resolved Raman spectroscopy to explore the Kondo-lattice coherence. Below the coherence tempera- ture T* = 45 K, the continuum of electronic excitations in the XY scattering geometry is suppressed at frequencies below 50cm-1, whereas the low-frequency continuum in the X’Y’ geometry exhibits …
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Research Update: Chiral Electronic Excitations in a Quasi-2D Rashba System BiTeI
By comparing spectroscopic data to calculations within a three-band model, the CB1 band was confirmed to have a Rashba dispersion with parameters similar to those given by DFT: ∆1 = 1.48 eV, αR = 1.35 eV ̊A and m∗ = 0.15 me. The CB2 parabolic dispersion differs significantly from DFT calculations: (∆2 , m∗ ) …
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Research Update: Charge density wave order in the kagome metal AV3Sb5 (A = Cs,Rb,K)
Our results provide an accurate basis for studying the interplay between multiple charge density wave order parameters in kagome metal systems, especially when these charge density wave order parameters are tuned by carrier doping, external pressure, or strain. In addition, they illuminate the studies of competing orders in several condensed-matter systems. WebLink: Phys. Rev. B …
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Critical charge fluctuations and quantum coherent state in excitonic insulator Ta2NiSe5
Pavel A. Volkov, Mai Ye, Himanshu Lohani, Irena Feldman, Amit Kanigel, Kristjan Haule, Girsh Blumberg (A) and (B): Raman response χ”aa and χ”ac in the aa and ac scattering geometries, respectively. (C) and (D): χ”aa and χ”ac in the range enclosed by the dashed white boxes in (A) and (B) on a linear frequency scale. Attraction between electrons in metals drives superconductivity – …
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