Rotational Symmetry Breaking in Sodium Doped Cuprates

Abstract

For reasonable parameters a hole bound to a Na^{+} acceptor in Ca_{2-x}Na_{x}CuO_{2}Cl_{2} has a doubly degenerate ground state whose components can be represented as states with even (odd) reflection symmetry around the x(y) -axes. The conductance pattern for one state is anisotropic as the tip of a tunneling microscope scans above the Cu-O-Cu bonds along the x(y)-axes. This anisotropy is pronounced at lower voltages but is reduced at higher voltages. Qualitative agreement with recent experiments leads us to propose this effect as an explanation of the broken local rotational symmetry.

arXiv comment10 pages, 4 figures

References in corpus (11)

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• Spectroscopic Imaging STM Studies of Electronic Structure in the Superconducting and Pseudogap Phases of Cuprate High-Tc Superconductors
• Electronic Structure of the Cuprate Superconducting and Pseudogap Phases from Spectroscopic Imaging STM
• Observation of superconducting pair density modulation within lattice unit cell
• On the Origin of the Checkerboard Pattern in Scanning Tunneling Microscopy Maps of Underdoped Cuprate Superconductors
• Nodal and nodeless gap in proximity induced superconductivity: application to monolayer CuO${}_2$ on BSCCO substrate
• Formation and local symmetry of Holstein polaron in t-J model
• Binding of a mobile hole by an impurity potential in the t-J model: parity breaking
• Unveiling Stripe-shaped Charge Density Modulations in Doped Mott Insulators