Pseudogap, Fermi arc, and Peierls-insulating phase induced by 3D–2D crossover in monolayer VSe2

Yuki Umemoto, Katsuaki Sugawara, Yuki Nakata, Takashi Takahashi, Takafumi Sato

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

One of important challenges in condensed-matter physics is to realize new quantum states of matter by manipulating the dimensionality of materials, as represented by the discovery of high-temperature superconductivity in atomic-layer pnictides and room-temperature quantum Hall effect in graphene. Transition-metal dichalcogenides (TMDs) provide a fertile platform for exploring novel quantum phenomena accompanied by the dimensionality change, since they exhibit a variety of electronic/magnetic states owing to quantum confinement. Here we report an anomalous metal-insulator transition induced by three-dimensional (3D)–two-dimensional (2D) crossover in monolayer 1T-VSe2 grown on bilayer graphene. We observed a complete insulating state with a finite energy gap on the entire Fermi surface in monolayer 1T-VSe2 at low temperatures, in sharp contrast to metallic nature of bulk. More surprisingly, monolayer 1T-VSe2 exhibits a pseudogap with Fermi arc at temperatures above the charge-density-wave temperature, showing a close resemblance to high-temperature cuprates. This similarity suggests a common underlying physics between two apparently different systems, pointing to the importance of charge/spin fluctuations to create the novel electronic states, such as pseudogap and Fermi arc, in these materials.[Figure not available: see fulltext.].

Original languageEnglish
Pages (from-to)165-169
Number of pages5
JournalNano Research
Volume12
Issue number1
DOIs
Publication statusPublished - 2019 Jan 1

Keywords

  • 1T-VSe
  • Fermi arc
  • charge density wave
  • electronic states
  • pseudogap
  • transition-metal dichalchogenides

ASJC Scopus subject areas

  • Materials Science(all)
  • Electrical and Electronic Engineering

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