Journal
PHYSICAL REVIEW LETTERS
Volume 125, Issue 18, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.125.186803
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Funding
- U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-SC0019025]
- Welch Foundation [F-1814]
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division of the U.S. Department of Energy [DE-AC02-05CH11231, KCWF16]
- U.S. Army Research Office under MURI [W911NF-17-1-0312]
- Elemental Strategy Initiative by the MEXT, Japan [JPMXP0112101001]
- JSPS KAKENHI [JP20H00354]
- CREST, JST [JPMJCR15F3]
- NSF [DMR 1552220, DMR 1904716, CMMI 1933214]
- Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program
- [DOE-SC0020653]
- U.S. Department of Energy (DOE) [DE-SC0019025] Funding Source: U.S. Department of Energy (DOE)
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We report the nanoscale conductivity imaging of correlated electronic states in angle-aligned WSe2/WS2 heterostructures using microwave impedance microscopy. The noncontact microwave probe allows us to observe the Mott insulating state with one hole per moire unit cell that persists for temperatures up to 150 K, consistent with other characterization techniques. In addition, we identify for the first time a Mott insulating state at one electron per moire unit cell. Appreciable inhomogeneity of the correlated states is directly visualized in the heterobilayer region, indicative of local disorders in the moire superlattice potential or electrostatic doping. Our work provides important insights on 2D moire systems down to the microscopic level.
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