Abstract
Scanning Tunneling Microscope (STM) experiments offer a unique insight into the inner workings of the superconducting state of high-Tc superconductors. Deliberately placed inside the material impurities perturb the coherent state and produce additional excitations. Superconducting excitation — quasiparticle — is a quantum-mechanical mixture of a negatively charged electron (-e) and a positively charged hole (+e). Depending on the applied voltage bias in STM one can sample the particle and hole content of a superconducting excitation. We argue that the complementary cross-shaped patterns observed on the positive and negative biases are the manifestation of the particle-hole duality of the quasiparticles.
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