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Electrical Tuning of the Excitonic Insulator Ground State of Ta_{2}NiSe_{5}.
Fukutani, Keisuke; Stania, Roland; Jung, Jiwon; Schwier, Eike F; Shimada, Kenya; Kwon, Chang Il; Kim, Jun Sung; Yeom, Han Woong.
Afiliação
  • Fukutani K; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Republic of Korea.
  • Stania R; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Republic of Korea.
  • Jung J; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Republic of Korea.
  • Schwier EF; Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
  • Shimada K; Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima, Japan.
  • Kwon CI; Hiroshima Synchrotron Radiation Center, Hiroshima University, 2-313 Kagamiyama, Higashi-Hiroshima, Hiroshima, Japan.
  • Kim JS; Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang 37673, Republic of Korea.
  • Yeom HW; Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.
Phys Rev Lett ; 123(20): 206401, 2019 Nov 15.
Article em En | MEDLINE | ID: mdl-31809082
ABSTRACT
We demonstrate that the excitonic insulator ground state of Ta_{2}NiSe_{5} can be electrically controlled by electropositive surface adsorbates. Our studies utilizing angle-resolved photoemission spectroscopy reveal intriguing wave-vector-dependent deformations of the characteristic flattop valence band of this material upon potassium adsorption. The observed band deformation indicates a reduction of the single-particle band gap due to the Stark effect near the surface. The present study provides the foundation for the electrical tuning of the many-body quantum states in excitonic insulators.

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2019 Tipo de documento: Article

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: Phys Rev Lett Ano de publicação: 2019 Tipo de documento: Article