Crossover from Fermi Arc to Full Fermi Surface

Abstract

The Fermi surface as a contour of the gapless quasiparticle excitation in momentum space is studied based on a mean-field theory of the doped Mott insulator, where the underlying pseudogap phase is characterized by a two-component resonating-valence-bond (RVB) order that vanishes in the overdoping at $\delta >{\delta }^{\ast }$. Here the quasiparticle emerges as a ``collective'' mode and a Fermi arc is naturally present in the pseudogap regime, while a full Fermi surface is recovered at $\delta >{\delta }^{\ast }$. The area enclosed by the gapless quasiparticle contour still satisfies the Luttinger volume in both cases, and the ``Fermi arc'' at $\delta <{\delta }^{\ast }$ is actually due to a significant reduction of the spectral weight caused by a quasiparticle fractionalization in the antinodal region. The endpoints of the Fermi arcs exhibit enhanced density of states or ``hotspots'', which can further give rise to a charge-density-wave-like quasiparticle interference pattern. At the critical doping ${\delta }^{\ast }$, the fractionalized spin excitations become gapless and incoherent which is signaled by a divergent specific heat. At $\delta >{\delta }^{\ast }$, the quasiparticle excitation restores the coherence over the full Fermi surface, but the fractionalization still persists at a higher energy/temperature which may be responsible for a strange metal behavior. Different mechanisms for the Fermi arc and experimental comparisons are briefly discussed.

arXiv comment20 pages, 13 figures

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Cited by in corpus (4)

• Sign structure of the $t$-$t^{\prime }$-$J$ model and its physical consequences
• Thermal Hall Effect and Neutral Spinons in a Doped Mott Insulator
• Electric transport in doped Mott insulators dictated by a non-Ioffe-Larkin composition rule and spinons
• Probing the pseudogap and beyond: Examining single-particle properties of the hole- and electron-doped Hubbard model