Electron-hole balance and the anomalous pressure-dependent superconductivity in black phosphorus
ORAL
Abstract
Here we report the first in-situ high pressure (up to ~ 50 GPa) Hall effect measurements on single crystal black phosphorus. We find a strong correlation between the sign of the Hall coefficient, an indicator of the dominant carrier type, and the superconducting transition temperature (TC). Importantly, we find a change from electron-dominant to hole-dominant carriers in the simple cubic phase of phosphorus at a pressure of ~17.2 GPa, providing an explanation for the puzzling valley it displays in its superconducting TC vs. pressure phase diagram. Our results reveal that hole-carriers play an important role in developing superconductivity in elemental phosphorus, and the valley in TC near 17.2 GPa is associated with a Lifshitz transition.
*The work in China was supported by the National Key Research and Development Program of China (Grant No. 2017YFA0302900, 2016YFA0300300 and 2017YFA0303103), the NSF of China (Grants No. 91321207, No. 11427805, No. 11404384, No. U1532267, No. 11604376), the Strategic Priority Research Program (B) of the C
–
Presenters
-
Jing Guo
- Institute of Physics, The Chinese Academy of Sciences