Patent ID: 7221005

Claim:
A negative resistance field-effect element comprising: an InAlAs or AlGaAs barrier layer ( 12 ) that, owing to being formed on an InP or GaAs substrate ( 11 ) having an asymmetrical V-groove whose surface on one side is a (100) plane and surface on the other side is a (011) plane, has a trench (TR), one of whose opposed lateral faces is a (111) A plane and the other of which is a (331) B plane; an InGaAs or GaAs quantum wire ( 13 ) grown on a trench bottom surface of the barrier layer as a high-mobility channel having a relatively narrow energy band gap; an InAlAs or AlGaAs spacer layer ( 21 ) grown on the quantum wire as a low-mobility channel having a relatively wide energy band gap; a source electrode ( 42 ) and a drain electrode ( 43 ) each in electrical continuity with the high-mobility channel ( 13 ) through a contact layer ( 30 ) and extending in a longitudinal direction of the quantum wire as spaced from each other; and a gate electrode ( 41 ) provided between the source electrode and the drain electrode to face the low-mobility channel through an insulating layer or a Schottky junction.