發送短信 : Optoelectronic properties of low-dimensional Dirac systems

 _    _     ______  __    __   _    _    _    _   
| \  / ||  /_   _// \ \\ / // | || | || | \  / || 
|  \/  ||   -| ||-   \ \/ //  | || | || |  \/  || 
| .  . ||   _| ||_    \  //   | \\_/ || | .  . || 
|_|\/|_||  /_____//    \//     \____//  |_|\/|_|| 
`-`  `-`   `-----`      `       `---`   `-`  `-`