Competing Orders and Quantum Phase Fluctuations on the Low-Energy Excitations and Pseudogap Phenomena of Cuprate Superconductors

Abstract

We investigate the low-energy quasiparticle excitation spectra of cuprate superconductors by incorporating both superconductivity (SC) and competing orders (CO) in the bare Green's function and quantum phase fluctuations in the proper self-energy. Our approach provides consistent explanations for various empirical observations, including the excess subgap quasiparticle density of states, ``dichotomy'' in the momentum-dependent quasiparticle coherence and the temperature-dependent gap evolution, and the presence (absence) of the low-energy pseudogap in hole- (electron-) type cuprates depending on the relative scale of the CO and SC energy gaps.

6 pages, 4 figures. Corresponding author: Nai-Chang Yeh ([email protected])

References in corpus (1)

• Checkerboard charge density wave and pseudogap in high-$T_c$ cuprates

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• Scanning tunneling spectroscopic evidence for magnetic field-induced microscopic orders in the high-$T_c$ superconductor YBa${}_2$Cu${}_3$O${}_{7-\delta }$
• Macroscopic evidence for quantum criticality and field-induced quantum fluctuations in cuprate superconductors
• Possible Competing Order-Induced Fermi Arcs in Cuprate Superconductors
• Electromagnetic response of high-Tc superconductors -- the slave-boson and doped-carrier theories