Department of Electronics, Nankai University, Tianjin 300071;
Department of Electronics, Nankai University, Tianjin 300071;
Department of Electronics, Nankai University, Tianjin 300071;
Department of Electronics, Nankai University, Tianjin 300071;
Department of Electronics, Nankai University, Tianjin 300071;
Department of Electronics, Nankai University, Tianjin 300071;
Department of Electronics, Nankai University, Tianjin 300071;
Department of Electronics, Nankai University, Tianjin 300071;
Institute of Bio- and Nanosystems and JARA Fundamentals of Future Information Technology, Forschungszentrum Julich, D-52425 Jiilich, Germany;