Nematic and stripe orders within the charge density wave state of doped TiSe 2
Résumé
In this work, we present a theory to reconcile conflicting experimental claims regarding the charge density wave (CDW) state in TiSe2, including whether there is a single or multiple CDW transitions and the occasional observation of rotation symmetry breaking. Using a k • p model coupled to the CDW order parameter, we show how commonplace conduction band doping x must cause a transition from the C3-symmetric 3Q state to a C3-breaking 1Q stripe state at a critical doping x1Q. In addition, for sufficient ellipticity of the conduction bands, as displayed by the realistic band stucture of TiSe2, a new nematic 3Q state also emerges in a region with x < x1Q. We then show how both stripe and nematic states emerge from a minimal interacting tight-binding model, for both positive and negative initial gaps. Our theory clarifies a long-standing puzzle and its predictions can be verified with a variety of probes including transport, photoemission and tunneling.
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2308.15541.pdf (2.07 Mo)
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2308.15541 (1).pdf (2.07 Mo)
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