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The transition metal dichalcogenide 1T-TaS2 attract growing attention becauseof the formation of rich density-wave (DW) and superconducting transitions.However, the origin of the incommensurate DW state at the highest temperature(~ 550 K), which is "the parent state" of the rich physical phenomena, is stilluncovered. Here, we present a natural explanation for the triple-qincommensurate DW in 1T-TaS2 based on the first-principles Hubbard model withon-site U. We apply the paramagnon interference mechanism that gives thenematic order in Fe-based superconductors. The derived order parameter has veryunique characters: (i) the orbital-selective nature, and (ii) theunconventional sign-reversal in both momentum and energy spaces. The presentstudy will be useful for understanding rich physics in 1T-TaS2, 1T-VSe2, andother transition metal dichalcogenides.

Unconventional orbital-charge density wave mechanism in transition metal dichalcogenide 1T-TaS2