Probing Time Reversal Symmetry Breaking Topological Superconductivity in Twisted Double Layer Copper Oxides with Polar Kerr Effect
Oguzhan Can, Xiao-Xiao Zhang, Catherine Kallin, Marcel Franz
DOI 10.1103/PhysRevLett.127.157001 · Physical Review Letters
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Abstract
Recent theoretical work predicted the emergence of a chiral topological superconducting phase with spontaneously broken time reversal symmetry in a twisted bilayer composed of two high-Tc cuprate monolayers such as Bi2Sr2CaCu2O8+δ. Here, we identify a large intrinsic Hall response that can be probed through the polar Kerr effect measurement as a convenient signature of the T-broken phase. Our modeling predicts the Kerr angle θK to be in the range of 10–100 μrad, which is a factor of 103 to 104 times larger than what is expected for the leading chiral superconductor candidate Sr2RuO4. In addition, we show that the optical Hall conductivity σH(ω) can be used to distinguish between the topological dx2−y2±idxy phase and the dx2−y2±is phase, which is also expected to be present in the phase diagram but is topologically trivial.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2O8+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| FeTexSe1-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Se3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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