Patent ID: 8648431

Claim:
An acoustic semiconductor device, comprising: an element unit including an acoustic resonance unit, the acoustic resonance unit including a semiconductor crystal, an acoustic standing wave being excitable in the acoustic resonance unit and being configured to be synchronously coupled with electric charge density within at least one portion of the semiconductor crystal via a deformation-potential coupling effect; and a first terminal electrically connected to the element unit, at least one selected from outputting and inputting an electrical signal being implementable via the first terminal, the electrical signal being coupled with the electric charge density, the outputting the electrical signal being from the acoustic resonance unit, the inputting the electrical signal being into the acoustic resonance unit; wherein the acoustic resonance unit includes: a base body on which the semiconductor crystal is disposed; an element-separating unit provided on the base body; and a semiconductor crystal resonance layer being provided on the base body and including a part of the semiconductor crystal, a side surface of the semiconductor crystal resonance layer being in contact with the element-separating unit, and an acoustic impedance of the element-separating unit being different from an acoustic impedance of the semiconductor crystal resonance layer.