Angle-resolved photoemission with circularly polarized light in the nodal mirror plane of underdoped Bi2Sr2CaCu2O8+ δ superconductor

Unraveling the nature of pseudogap phase in high-temperature superconductors holds the key to understanding their superconducting mechanisms and potentially broadening their applications via enhancement of their superconducting transition temperatures. Angle-resolved photoemission spectroscopy (ARPE...

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Bibliographic Details
Published in:	Applied physics letters Vol. 109; no. 18
Main Authors:	He, Junfeng, Mion, Thomas R., Gao, Shang, Myers, Gavin T., Arita, Masashi, Shimada, Kenya, Gu, G. D., He, Rui-Hua
Format:	Journal Article
Language:	English
Published:	Melville American Institute of Physics 31-10-2016 American Institute of Physics (AIP)
Subjects:	Applied physics Broken symmetry Circular polarization CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY Cuprates Dependence Dichroism Extinction Photoelectric emission Polarized light Superconductivity Superconductors Symmetry
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Summary:	Unraveling the nature of pseudogap phase in high-temperature superconductors holds the key to understanding their superconducting mechanisms and potentially broadening their applications via enhancement of their superconducting transition temperatures. Angle-resolved photoemission spectroscopy (ARPES) experiments using circularly polarized light have been proposed to detect possible symmetry breaking state in the pseudogap phase of cuprates. The presence (absence) of an electronic order which breaks mirror symmetry of the crystal would in principle induce a finite (zero) circular dichroism in photoemission. Different orders breaking reflection symmetries about different mirror planes can also be distinguished by the momentum dependence of the measured circular dichroism. Here, we report ARPES experiment on an underdoped Bi2Sr2CaCu2O8+ δ (Bi2212) superconductor in the Γ (0,0)-Y (π,π) nodal mirror plane using circularly polarized light. No circular dichroism is observed on the level of ∼2% at low temperature, which places a clear constraint on the forms of possible symmetry breaking orders in this sample. Meanwhile, we find that the geometric dichroism remains substantial very close to its perfect extinction such that a very small sample angular offset is sufficient to induce a sizeable dichroic signal. It highlights the importance to establish a perfect extinction of geometric dichroism as a prerequisite for the identification of any intrinsic circular dichroism in this material.
Bibliography:	USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22) SC00112704 BNL-113432-2017-JA
ISSN:	0003-6951 1077-3118
DOI:	10.1063/1.4966994