caa a22 4500 445303468 CHVBK 20180317142605.0 cr unu---uuuuu 170323e20101201xx s 000 0 eng 10.1007/s12274-010-0060-2 doi (NATIONALLICENCE)springer-10.1007/s12274-010-0060-2 Atomically smooth ultrathin films of topological insulator Sb2Te3 [Elektronische Daten] [Guang Wang, Xiegang Zhu, Jing Wen, Xi Chen, Ke He, Lili Wang, Xucun Ma, Ying Liu, Xi Dai, Zhong Fang, Jinfeng Jia, Qikun Xue] The growth and characterization of single-crystalline thin films of topological insulators (TIs) is an important step towards their possible applications. Using in situ scanning tunneling microscopy (STM) and angle-resolved photoemission spectroscopy (ARPES), we show that moderately thick Sb2Te3 films grown layer-by-layer by molecular beam epitaxy (MBE) on Si(111) are atomically smooth, single-crystalline, and intrinsically insulating. Furthermore, these films were found to exhibit a robust TI electronic structure with their Fermi energy lying within the energy gap of the bulk that intersects only the Dirac cone of the surface states. Depositing Cs in situ moves the Fermi energy of the Sb2Te3 films without changing the electronic band structure, as predicted by theory. We found that the TI behavior is preserved in Sb2Te3 films down to five quintuple layers (QLs). Tsinghua University Press and Springer-Verlag Berlin Heidelberg, 2010 Topological insulator nationallicence electronic structure nationallicence scanning tunneling microscopy nationallicence angle-resolved photoemission spectroscopy nationallicence molecular beam epitaxy nationallicence Wang Guang Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut Zhu Xiegang Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut Wen Jing Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut Chen Xi Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut He Ke Institute of Physics, the Chinese Academy of Sciences, 100190, Beijing, China aut Wang Lili Institute of Physics, the Chinese Academy of Sciences, 100190, Beijing, China aut Ma Xucun Institute of Physics, the Chinese Academy of Sciences, 100190, Beijing, China aut Liu Ying Department of Physics, The Pennsylvania State University, 16802, Pennsylvania, USA aut Dai Xi Institute of Physics, the Chinese Academy of Sciences, 100190, Beijing, China aut Fang Zhong Institute of Physics, the Chinese Academy of Sciences, 100190, Beijing, China aut Jia Jinfeng Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut Xue Qikun Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut Nano Research Tsinghua Press 3/12(2010-12-01), 874-880 1998-0124 3:12<874 2010 3 12274 https://doi.org/10.1007/s12274-010-0060-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12274-010-0060-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Wang Guang Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut NATIONALLICENCE 700 1- Zhu Xiegang Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut NATIONALLICENCE 700 1- Wen Jing Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut NATIONALLICENCE 700 1- Chen Xi Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut NATIONALLICENCE 700 1- He Ke Institute of Physics, the Chinese Academy of Sciences, 100190, Beijing, China aut NATIONALLICENCE 700 1- Wang Lili Institute of Physics, the Chinese Academy of Sciences, 100190, Beijing, China aut NATIONALLICENCE 700 1- Ma Xucun Institute of Physics, the Chinese Academy of Sciences, 100190, Beijing, China aut NATIONALLICENCE 700 1- Liu Ying Department of Physics, The Pennsylvania State University, 16802, Pennsylvania, USA aut NATIONALLICENCE 700 1- Dai Xi Institute of Physics, the Chinese Academy of Sciences, 100190, Beijing, China aut NATIONALLICENCE 700 1- Fang Zhong Institute of Physics, the Chinese Academy of Sciences, 100190, Beijing, China aut NATIONALLICENCE 700 1- Jia Jinfeng Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut NATIONALLICENCE 700 1- Xue Qikun Key Lab for Atomic, Molecular and Nanoscience, Department of Physics, Tsinghua University, 100084, Beijing, China aut NATIONALLICENCE 773 0- Nano Research Tsinghua Press 3/12(2010-12-01), 874-880 1998-0124 3:12<874 2010 3 12274 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer