Affiliation:
1. Center for Correlated Electron Systems Institute for Basic Science Seoul 08826 South Korea
2. Department of Physics and Astronomy Seoul National University Seoul 08826 South Korea
Abstract
AbstractDivergent density of states (DOS) can induce extraordinary phenomena such as significant enhancement of superconductivity and unexpected phase transitions. Moreover, van Hove singularities (VHSs) lead to divergent DOS in 2D systems. Despite recent interest in VHSs, only a few controllable cases have been reported to date. In this work, by utilizing an atomically ultra‐thin SrRuO3 film, the electronic structure of a 2D VHS is investigated with angle‐resolved photoemission spectroscopy and transport properties are controlled. By applying electric fields with alkali metal deposition and ionic‐liquid gating methods, the 2D VHS and the sign of the charge carrier are precisely controlled. Use of a tunable 2D VHS in an atomically flat oxide film could serve as a new strategy to realize infinite DOS near the Fermi level, thereby allowing efficient tuning of electric properties.
Funder
Institute for Basic Science
Ministry of Science and ICT, South Korea
Subject
Mechanical Engineering,Mechanics of Materials,General Materials Science