Observation of Mott Localization Gap Using Low Temperature Scanning Tunneling Spectroscopy in Commensurate <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>1</mn><mi>T</mi><mo>−</mo><mi mathvariant="normal">T</mi><mi mathvariant="normal">a</mi><mrow><msub><mrow><mi mathvariant="normal">Sa</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

Ju-Jin Kim; W. Yamaguchi; T. Hasegawa; K. Kitazawa

doi:10.1103/PhysRevLett.73.2103

Observation of Mott Localization Gap Using Low Temperature Scanning Tunneling Spectroscopy in Commensurate $1 T - T a {Sa}_{2}$

Ju-Jin Kim, W. Yamaguchi, T. Hasegawa, and K. Kitazawa

Phys. Rev. Lett. 73, 2103 – Published 10 October 1994

Abstract

The site-specified tunneling spectroscopy on $1 T - T a {Sa}_{2}$ at 77 K and room temperature indicated a wide opening of energy gap at the Fermi level at 77 K. The gap at the Fermi level was attributed to the Mott localization in the commensurate charge density wave (CDW) phase. The determined gap size on both sides of the Fermi level was about 400-500 mV at 77 K. A significant charge transfer was observed from CDW trough to crest. This charge transfer was derived from the electron localization on the CDW crest induced by Mott localization.