1. Observation of strange metal in hole-doped valley-spin insulator
- Author
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Nguyen, Tuan Dung, Mallesh, Baithi, Kim, Seon Je, Bouzid, Houcine, Cho, Byeongwook, Le, Xuan Phu, Ngo, Tien Dat, Yoo, Won Jong, Kim, Young-Min, Duong, Dinh Loc, and Lee, Young Hee
- Subjects
Condensed Matter - Strongly Correlated Electrons - Abstract
Temperature-linear resistance at low temperatures in strange metals is an exotic characteristic of strong correlation systems, as observed in high-TC superconducting cuprates, heavy fermions, Fe-based superconductors, ruthenates, and twisted bilayer graphene. Here, we introduce a hole-doped valley-spin insulator, V-doped WSe2, with hole pockets in the valence band. The strange metal characteristic was observed in VxW1-xSe2 at a critical carrier concentration of 9.5 x 10^20 cm-3 from 150 K to 1.8 K. The unsaturated magnetoresistance is almost linearly proportional to the magnetic field. Using the ansatz R(H,T) - R(0,0) ~ [(alpha.k.T)^2+(gamma.mu.B)^2]^1/2, the gamma/alpha ratio is estimated approximately to 4, distinct from that for the quasiparticles of LSCO, BaFe2(As1-xPx)2 (gamma/alpha=1) and bosons of YBCO (gamma/alpha=2). Our observation opens up the possible routes that induce strong correlation and superconductivity in two-dimensional materials with strong spin-orbit coupling., Comment: 8 pages, 4 figures + Supplemental Material
- Published
- 2022