Dimensionality-driven power-law gap in the bilayer TaTe2 grown by molecular-beam epitaxy
Source abstract
Abstract
Reducing dimensionality can induce profound modifications to the physical properties of a system. In two-dimensional TaS2 and TaSe2, the charge-density wave phase accompanies a Mott transition, thus realizing the strongly correlated insulating state. However, this scenario deviates from TaTe2 due to p–d hybridization, resulting in a substantial contribution of Te 5p at the Fermi level. Here, we show that, differently from the Mott insulating phase of its sister compounds, bilayer TaTe2 hosts a power-law (V-shaped) gap at the Fermi level reminiscent of a Coulomb gap. It suggests the possible role of unscreened long-range Coulomb interactions emerging in lowered dimensions, potentially coupled with a disordered short-range charge-density wave. Our findings reveal the importance of long-range interactions sensitive to interlayer screening, providing another venue for the interplay of complex quantum phenomena in two-dimensional materials.
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Research context
OpenAlex topics: 2D Materials and Applications · Electronic and Structural Properties of Oxides · Molecular Junctions and Nanostructures
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
Department of Applied Physics, The University of Tokyo 1 , Tokyo 113-8654, Japan
Quantum Materials Science Unit, Okinawa Institute of Science and Technology Graduate University 2 , Okinawa 904-0495, Japan
RIKEN Center for Emergent Matter Science (CEMS) 3 , Wako 351-0198, Japan
Quantum-Phase Electronics Center (QPEC), The University of Tokyo 4 , Wako 113-8656, Japan
Research Institute for Synchrotron Radiation Science, Hiroshima University 5 , Higashi-Hiroshima 739-0046, Japan
Institute of Industrial Science, The University of Tokyo 6 , Tokyo 153-8505, Japan
Division of Materials Physics and Center for Spintronics Research Network (CSRN), Osaka University 7 , Osaka 560-8531, Japan
Spintronics Research Network Division, Institute for Open and Transdisciplinary Research Initiatives, Osaka University 8 , Osaka 560-8531, Japan
Funding
Japan Society for the Promotion of Science · Japan Science and Technology Agency
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