Evidence for excitonic condensation and superfluidity in black phosphorus.

ABSTRACT: Excitonic condensation refers to the spontaneous formation of correlated electron-hole pairs. These collective states, also known as excitonic insulator, are expected to lead to intriguing many-body physics such as Bose-Einstein-condensates and Bardeen-Cooper-Schrieffer crossover. While the occurrence of excitonic insulator has been confirmed by measuring charge gaps, related macro-quantum phenomenon are less often observed. Here we report the signature of exciton insulator and its superfluidity in dual-gate few layer black phosphorus. Using Fourier transform infrared photo-current spectroscopy, we characterize the behavior of electron-hole pairs in black phosphorus. When shrinking the bandgap of photo-excited black phosphorus by electric displacement, we observe excitonic insulator format

SUBMITTER: Mei J 

PROVIDER: S-EPMC12012148 | biostudies-literature | 2025 Apr

REPOSITORIES: biostudies-literature