Jorge Luis Borges, although not strictly a science fiction author in the traditional sense, wrote some stories with strong science - fictional elements. His stories are highly imaginative and often play with concepts of time and space. Robert Heinlein also penned some great short science fiction. His works often deal with themes of human nature and society in the context of future or alien settings. And don't forget Ted Chiang. His short stories, like 'Story of Your Life', are both scientifically accurate and deeply moving.
Ursula K. Le Guin is famous for her science fiction short stories, such as 'The Ones Who Walk Away from Omelas'. Philip K. Dick has also created some amazing short works. His stories often have a mind - bending quality, exploring complex ideas about reality and identity. Another author is Harlan Ellison. His short stories are known for their edginess and unique perspectives, like in 'I Have No Mouth, and I Must Scream' which is a very dark and powerful story.