أرسل هذا في رسالة قصيرة: Calculation of quantum tunneling for a spatially extended defect : the dislocation kink in copper has a low effective mass

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