Acoustic wave amplification in quantum semiconductor structures

Physica Status Solidi (B): Basic Research - Tập 193 Số 2 - Trang 363-374 - 1996
Clóves Gonçalves Rodrigues1, M. A. Amato1, O. A. C. Nunes1
1Departamento de Fisica, Universidade de Brasilia

Tóm tắt

AbstractA microscopic theory of acoustic wave amplification is presented for an ideal, periodic array of quantum wells (superlattice) in the presence of an applied electric field. The effect of the external field is to produce a drift velocity of the charge carriers in the superlattice heterostructure such that when this drift velocity exceeds the acoustic wave velocity, the confined electrons can lose energy to the acoustic wave and an acoustic amplification rather than attenuation occurs. It is shown that for these quantum semiconductor structures provided they can be tailored, acoustic wave amplification can occur at much larger rate and at much lower electric fields as compared with the bulk structure.

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Tài liệu tham khảo

10.1103/RevModPhys.54.437

10.1103/RevModPhys.62.173

10.1103/PhysRevB.28.1124

10.1063/1.352386

10.1143/JJAP.19.L735

10.1103/PhysRevLett.7.237

Goldman, 1961, Problems in Quantum Mechanics

Mahan G. D., 1981, Many‐Particle Physics, 39

10.1016/S0081-1947(08)60531-7

10.1016/0749-6036(85)90033-3

10.1088/0022-3719/15/28/021

10.1080/14786436308212497

10.1016/S0375-9601(63)80016-X

10.1103/PhysRev.134.A1302

Morse R. W., 1959, Progr. Cryogenics, 1, 221

Lee Y. C., 1969, Phys. Rev., 178, 1302

10.1103/PhysRev.89.689

McFee J. H., 1966, Physical Acoustics, 1

Weisbuch C., 1991, Quantum Semiconductor Structure, 112

Ridley B. K., 1982, Quantum Processes in Semiconductors, 119

Thông tin
Thông tin xuất bản

Physica Status Solidi (B): Basic Research

Tập 193 Số 2

363-374

Thông tin tác giả