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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

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Charge-order-enhanced capacitance in semiconductor moiré superlattices.

Tingxin Li¹, Jiacheng Zhu¹, Yanhao Tang¹

¹School of Applied and Engineering Physics, Cornell University, Ithaca, NY, USA.

Nature Nanotechnology

|August 24, 2021

Summary

Researchers studied thermodynamic properties of correlated insulating states in Van der Waals moiré materials using gate capacitance measurements. They observed anomalously large capacitance, revealing insights into electronic correlations and enabling property extraction.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanoscience

Background:

Van der Waals moiré materials offer a tunable platform for investigating electronic correlation phenomena.
Correlated insulating states have been identified in semiconductor moiré systems at various filling factors.

Purpose of the Study:

To explore the thermodynamic properties of correlated insulating states in MoSe₂/WS₂ moiré superlattices.
To utilize gate capacitance measurements as a probe for understanding these electronic states.

Main Methods:

Measurement of gate capacitance in MoSe₂/WS₂ moiré superlattices.
Analysis of capacitance variations across different filling factors (0-8).

Main Results:

Observation of incompressible states at integer and fractional filling factors.
Discovery of anomalously large capacitance (up to 60% above geometrical capacitance) in compressible regions.
Identification of device-geometry-dependent Coulomb interactions and charge-ordered state phase mixing as the cause of large capacitance.

Conclusions:

Gate capacitance is established as a powerful technique for probing correlated states in semiconductor moiré systems.
Thermodynamic properties, including the gap, electronic entropy, and specific heat capacity, were successfully extracted.
Control over these correlated states can be achieved through sample-gate coupling.