أرسل هذا في رسالة قصيرة: Topological interface state formation in an hourglass lattice sandwich meta-structure

 __   _    _    _    _    _    _    _    _    _   
| || | || | || | || | \  / || | || | || | \  / || 
| '--' || | || | || |  \/  || | || | || |  \/  || 
| .--. || | \\_/ || | .  . || | \\_/ || | .  . || 
|_|| |_||  \____//  |_|\/|_||  \____//  |_|\/|_|| 
`-`  `-`    `---`   `-`  `-`    `---`   `-`  `-`