Imaging Interlayer Exciton Superfluidity in a 2D Semiconductor Heterostructure
Author Information
Author(s): Jacob Cutshall, Fateme Mahdikhany, Anna Roche, Daniel N. Shanks, Michael R. Koehler, David G. Mandrus, Takashi Taniguchi, Kenji Watanabe, Qizhong Zhu, Brian J. LeRoy, John R. Schaibley
Primary Institution: University of Arizona
Hypothesis
Can interlayer excitons in a 2D semiconductor heterostructure form a superfluid state?
Conclusion
The study successfully images a macroscopic exciton superfluid state in a 2D semiconductor heterostructure, persisting to a temperature of 15 K.
Supporting Evidence
- The study directly images the exciton superfluid state in a 2D semiconductor heterostructure.
- Quasi-long-range order was identified through spatially resolved coherence measurements.
- The superfluid phase was observed to persist to a temperature of 15 K.
- The results align well with theoretical predictions regarding exciton superfluidity.
Takeaway
The researchers looked at a special type of particle called excitons in a thin material and found that they can act like a superfluid, which is a state where they flow without resistance.
Methodology
The study involved imaging the exciton superfluidity using spatial coherence measurements in an hBN-separated MoSe2-WSe2 heterostructure.
Limitations
The estimation of exciton density in the hBN region is difficult due to unknown interlayer carrier transfer rates.
Digital Object Identifier (DOI)
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