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 |__  //    / _ \\  | |  | ||  /_   _//   ____    
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 /_____||   \___//  |_// \_||  /_____//  |  __//  
 `-----`    `---`   `-`   `-`  `-----`   |_|`-`   
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Text this: Source engineering for tunnel field-effect transistor: Elevated source with vertical silicon-germanium/germanium heterostructure