@article{d28ff540eb79470195639d3cbdec40d6,
title = "Phonon-dressed two-dimensional carriers on the ZnO surface",
abstract = "Two-dimensional (2D) metallic states formed on the ZnO(1010) surface by hydrogen adsorption have been investigated using angle-resolved photoelectron spectroscopy (ARPES). The observed metallic state is characterized by a peak-dip-hump structure at just below the Fermi level and a long tail structure extending up to 600 meV in binding energy. The peak and hump positions are separated by about 70 meV, a value close to the excitation energy of longitudinal optical (LO) phonons. Spectral functions formulated on the basis of the 2D electron-phonon coupling well reproduce the ARPES intensity distribution of the metallic states. This spectral analysis suggests that the 2D electrons accumulated on the ZnO surface couple to the LO phonons and that this coupling is the origin of the anomalous long tail. Our results indicate that the 2D electrons at the ZnO surface are described as the electron liquid model.",
author = "R. Yukawa and K. Ozawa and S. Yamamoto and H. Iwasawa and K. Shimada and Schwier, {E. F.} and K. Yoshimatsu and H. Kumigashira and H. Namatame and M. Taniguchi and I. Matsuda",
note = "Funding Information: E.F.S. acknowledges financial support from a JSPS postdoctoral fellowship for overseas researchers and the Alexander von Humboldt Foundation (Grant No. P13783). This work was supported by a Grant-in-Aid for Scientific Research (Grant No. 21560695) from MEXT in Japan. This work was carried out by the joint research in the Synchrotron Radiation Research Organization and the Institute for Solid State Physics, the University of Tokyo (Proposals No. 2012B7401, No. 2013A7401, and No. 2013B7401). The synchrotron radiation experiments were performed with the approval of HSRC (Proposal No. 12-B-2). The work at KEK-PF was performed under the approval of the Program Advisory Committee (Proposals No. 2012G137 and No. 2013S2-002) at the Institute of Materials Structure Science, KEK. Publisher Copyright: {\textcopyright} 2016 American Physical Society.",
year = "2016",
month = oct,
day = "26",
doi = "10.1103/PhysRevB.94.165313",
language = "English",
volume = "94",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "16",
}