Observation of strange metal in hole-doped valley-spin insulator

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-s...

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Published inarXiv.org
Main Authors Nguyen, Tuan Dung, Mallesh, Baithi, Kim, Seon Je, Bouzid, Houcine, Cho, Byeongwook, Le, Xuan Phu, Tien Dat Ngo, Won Jong Yoo, Young-Min, Kim, Duong, Dinh Loc, Lee, Young Hee
Format Paper
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 08.09.2022
Subjects
Bilayers
Bosons
Carrier density
Cuprates
Elementary excitations
Fermions
Graphene
Low temperature
Low temperature resistance
Magnetoresistance
Magnetoresistivity
Spin-orbit interactions
Superconductivity
Superconductors
Two dimensional materials
Valence band
Valleys
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Summary: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.
ISSN:2331-8422