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Leo Esaki
Leo Esaki 1959.jpg
Leo Esaki in 1959
Born (1925-03-12) March 12, 1925 (age 97)
Nationality Japan
Alma mater University of Tokyo
Known for electron tunneling, Esaki diode
Awards Stuart Ballantine Medal (1961)
Nobel Prize in Physics (1973)
IEEE Medal of Honor
Scientific career
Fields Applied physics

Reona Esaki (江崎 玲於奈 Esaki Reona, born March 12, 1925), also known as Leo Esaki, is a Japanese physicist. He was awarded the Nobel Prize in Physics in 1973 with Ivar Giaever and Brian David Josephson. He won the prize for his discovery of the phenomenon of electron tunneling.

He is known for his invention of the Esaki diode, which exploited that phenomenon. This research was done when he was with Tokyo Tsushin Kogyo (now known as Sony). He has also contributed in being a pioneer of the semiconductor superlattice while he was with IBM.

Esaki was born on March 12, 1925 in Osaka, Japan. He studied at the University of Tokyo.

  • Leo Esaki – Biography. Retrieved Aug. 5, 2003 from
  • IEEE History Center – Leo Esaki. Retrieved Jul. 19, 2011 from
  • Sony History – The Esaki Diode. Retrieved Aug. 5, 2003 from

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