Anisotropic time-domain electronic response in cuprates driven by midinfrared pulses

Article

关键词: LIGHT-INDUCED SUPERCONDUCTIVITY;    RAMAN-SCATTERING;    TEMPERATURE;    SPECTROSCOPY;    FLUCTUATIONS;    TRANSITION;    PROBE;    GAP;   

DOI  :  10.1103/PhysRevB.104.125121

来源: SCIE

【 摘 要 】

Superconductivity in the cuprates is characterized by an anisotropic electronic gap of d-wave symmetry. The aim of this work is to understand how this anisotropy affects the nonequilibrium electronic response of high-T-c superconductors. Here we use a polarization selective time domain experiment to address the dynamics of electronic excitation of different symmetry in optimally doped Bi2Sr2 Y0.08Ca0.92Cu2O8+delta and measure the nodal and antinodal nonequilibrium response resulting from photoexcitations with ultrashort pulses with photon energy comparable to the superconducting gap. The response to long wavelength photoexcitation with pump polarization along the Cu-Cu axis of the sample is discussed with the support of an effective d-wave BCS model which suggests that such transient response could be ascribed to an increase of pair coherence in the antinodal region.

【 授权许可】

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