1 School of Electrical and Electronic Engineering, Yonsei University, 120-749, Seoul, Korea.
2 Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, 790-784, Pohang, Korea.
3 Spin Optics Laboratory, St. Petersburg State University, 198504, St. Petersburg, Russia.
4 Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, 790-784, Pohang, Korea.
5 Department of Materials Science and Engineering, Yonsei University, 120-749, Seoul, Korea.
6 Center for Artificial Low Dimensional Electronic Systems, Institute for Basic Science (IBS), Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, 790-784, Pohang, Korea. mhjo@postech.ac.kr.
7 Division of Advanced Materials Science, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, 790-784, Pohang, Korea. mhjo@postech.ac.kr.
8 Department of Materials Science and Engineering, Pohang University of Science and Technology (POSTECH), 77 Cheongam-Ro, 790-784, Pohang, Korea. mhjo@postech.ac.kr.
9 School of Electrical and Electronic Engineering, Yonsei University, 120-749, Seoul, Korea. hychoi@yonsei.ac.kr.
In the originally published HTML and PDF versions of this article, Figs. 3g and 4d contained typesetting errors affecting the way the data points were displayed. This has now been corrected in the HTML and PDF versions.