Progress in Physics

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12 October 2020, Volume 39 Issue 2 Next Issue

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Recent progress of spectroscopy of double-donors in ZnO

Zheng Hao，Richard Berndt

2019, 39 (2): 39-50.

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Single dopant atoms in a semiconductor matrix are of interest in condensed matter physics, quantum computation, materials science, and nanotechnology. In this brief review, we survey our recent experimental progress in the scanning tunneling microscopy and spectroscopy of monomers and dimers of double-donor impurity atoms in the wide band gap semiconductor ZnO. We observed that tip-induced band-bending leads to the ionization of isolated doubledonors as well as vibrational excitation. Furthermore, it turned out that subsurface impurities may be pushed and pulled in a controllable way using a scanning tunneling microscope tip. Spectroscopic maps of donors exhibit features that are closely related to those observed from single-electron transistors, and enable the determination of important parameters by simple modeling. Donor excitation spectra show that strongly coupled dimers of double donors may be used to construct double quantum dots with minimal size. This may be viewed as a step towards quantum electronics with an atomic-scale structure.

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Study on the Electronic Structure of High Temperature Superconductors

Peng Shu-Ting, Wei Zhi-Yuan, Zhao Zhi-Sheng, Hu Yong, He Jun-Feng

2019, 39 (2): 51-79.

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The mechanism of high temperature superconductivity is a key issue in condensed matter physics. In order to reveal the orders and interactions which are essential to superconductivity, a direct way is to unravel the electronic structure of the high temperature superconducting materials. In this paper, we review some of the studies on high-temperature cuprate superconductors and iron-based superconductors via angle-resolved photoemission spectroscopy (ARPES) and resonant elastic X- ray scattering (REXS). We mainly focus on Bi2Sr2CaCu2O8+ , YBa2Cu3O7??x/La0:7Ca0:3MnO3 heterostructures and FeSe lms grown on SrTiO3 substrate.