{"database":"biostudies-literature","file_versions":[],"scores":null,"additional":{"submitter":["Watson L"],"funding":["Universidad Aut?noma de Madrid","Centre of Excellence in Future Low-Energy Electronics Technologies, Australian Research Council","National Research Foundation Singapore","Ministry of Education - Singapore","Agencia Estatal de Investigaci?n","HORIZON EUROPE Marie Sklodowska-Curie Actions","Australian Research Council"],"pagination":["32374-32381"],"full_dataset_link":["https://www.ebi.ac.uk/biostudies/studies/S-EPMC12445006"],"repository":["biostudies-literature"],"omics_type":["Unknown"],"volume":["19(36)"],"pubmed_abstract":["Strong electron-hole interactions in a semimetal or narrow-gap semiconductor may drive a ground state of condensed excitons. Monolayer WTe<sub>2</sub> has been proposed as a host material for such an exciton condensate, but the order parameter─the key signature of a macroscopic quantum-coherent condensate─has not been observed. Here, we use Fourier-transform scanning tunneling spectroscopy (FT-STS) to study quasiparticle interference (QPI) and periodic modulations of the local density of states (LDOS) in monolayer WTe<sub>2</sub>. In WTe<sub>2</sub> on graphene, in which the carrier density can be varied via back-gating, FT-STS shows QPI features in the two-dimensional (2D) bulk bands, confirming the interacting nature of the bandgap in neutral WTe<sub>2</sub> and the semimetallic nature of highly n- and p-doped WTe<sub>2</sub>. We observe additional nondispersive spatial modulations in the LDOS imprinted on the topological edge mode of neutral WTe<sub>2</sub> on metallic substrates (graphene and graphite), which we interpret as the interaction of the topological edge mode with the expected charge density wave order parameter of the excitonic condensate in WTe<sub>2</sub> at low interaction strength due to screening by the metallic substrates."],"journal":["ACS nano"],"pubmed_title":["Observation of the Charge Density Wave Excitonic Order Parameter in Topological Insulator Monolayer WTe&lt;sub&gt;2&lt;/sub&gt;."],"pmcid":["PMC12445006"],"funding_grant_id":["101063547","CEX2020001039-S","CEX2018000805- M","CNS2022-135175","FT2201000290","PID2021-123776NB-C21","NRF-CRP21-2018-0001","RYC2020-029317- I","CE170100039","MOE-MOET32023-0003"],"pubmed_authors":["Garnica M","Di Bernardo I","Papaj M","Tong Z","Watson L","Edmonds MT","Weber B","Fuhrer MS","Que Y","Vazquez de Parga AL","Lin H","Mukherjee S","Ripoll J","Kumar A","Chan YH"],"additional_accession":[]},"is_claimable":false,"name":"Observation of the Charge Density Wave Excitonic Order Parameter in Topological Insulator Monolayer WTe&lt;sub&gt;2&lt;/sub&gt;.","description":"Strong electron-hole interactions in a semimetal or narrow-gap semiconductor may drive a ground state of condensed excitons. Monolayer WTe<sub>2</sub> has been proposed as a host material for such an exciton condensate, but the order parameter─the key signature of a macroscopic quantum-coherent condensate─has not been observed. Here, we use Fourier-transform scanning tunneling spectroscopy (FT-STS) to study quasiparticle interference (QPI) and periodic modulations of the local density of states (LDOS) in monolayer WTe<sub>2</sub>. In WTe<sub>2</sub> on graphene, in which the carrier density can be varied via back-gating, FT-STS shows QPI features in the two-dimensional (2D) bulk bands, confirming the interacting nature of the bandgap in neutral WTe<sub>2</sub> and the semimetallic nature of highly n- and p-doped WTe<sub>2</sub>. We observe additional nondispersive spatial modulations in the LDOS imprinted on the topological edge mode of neutral WTe<sub>2</sub> on metallic substrates (graphene and graphite), which we interpret as the interaction of the topological edge mode with the expected charge density wave order parameter of the excitonic condensate in WTe<sub>2</sub> at low interaction strength due to screening by the metallic substrates.","dates":{"release":"2025-01-01T00:00:00Z","publication":"2025 Sep","modification":"2026-06-03T15:28:00.882Z","creation":"2026-04-29T03:12:27.709Z"},"accession":"S-EPMC12445006","cross_references":{"pubmed":["40906760"],"doi":["10.1021/acsnano.5c08005"]}}