LATERAL TUNNELING, DEPOPULATION, AND CROSSOVER EFFECTS ON MAGNETOPLASMONS IN MULTIWIRE SUPERLATTICES

被引:21
作者
GUMBS, G
HUANG, DH
HEITMANN, D
机构
[1] MIT,DEPT PHYS,CAMBRIDGE,MA 02139
[2] MAX PLANCK INST FESTKORPERFORSCH,W-7000 STUTTGART 80,GERMANY
来源
PHYSICAL REVIEW B | 1991年 / 44卷 / 15期
关键词
D O I
10.1103/PhysRevB.44.8084
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We derive the dispersion relation for magnetoplasmons in the random-phase approximation for a quantum-wire superlattice in the limit of strong lateral modulation and with a quantizing magnetic field B applied perpendicular to the plane of the system. We include lateral electron tunneling between adjacent quantum wires in the tight-binding approximation. Account is also taken of the dependence of the areal electron density and modulation strength on the varying gate voltage. We have also examined the role played by modulation strength (i.e., barrier height) and applied magnetic field on the collective modes. In this model, we study the crossover behavior of magnetoplasmons as the confinement varies continuously from the one-dimensional (1D) regime (strong modulation of the 2D electron gas) to the threshold of two-dimensional behavior where lateral electron tunneling becomes strong. We also study the single-particle properties such as the electron energy levels, Fermi energy, and level occupation number as functions of magnetic field, barrier height, and wire separation. Whenever there is a depopulation of a 1D Landau subband which can be produced by increasing the magnetic field or the gate voltage or by reducing the wire separation, there are abrupt changes in the slope of the Fermi-energy curve. This behavior is also obtained for the collective modes. Our model successfully reproduces several interesting features recently observed with use of far-infrared spectroscopy. Also, a commensurability relation between cyclotron orbits and umklapp scattering is predicted.
引用
收藏
页码:8084 / 8096
页数:13
相关论文
共 17 条
  • [1] SUBBAND SPACINGS OF QUASI-ONE-DIMENSIONAL INVERSION CHANNELS ON INSB
    ALSMEIER, J
    SIKORSKI, C
    MERKT, U
    [J]. PHYSICAL REVIEW B, 1988, 37 (08): : 4314 - 4316
  • [2] MAGNETIC DEPOPULATION OF 1D SUBBANDS IN A NARROW 2D ELECTRON-GAS IN A GAAS-ALGAAS HETEROJUNCTION
    BERGGREN, KF
    THORNTON, TJ
    NEWSON, DJ
    PEPPER, M
    [J]. PHYSICAL REVIEW LETTERS, 1986, 57 (14) : 1769 - 1772
  • [3] ONE-DIMENSIONAL SUBBANDS OF NARROW ELECTRON CHANNELS IN GATED ALXGA1-XAS GAAS HETEROJUNCTIONS
    BRINKOP, F
    HANSEN, W
    KOTTHAUS, JP
    PLOOG, K
    [J]. PHYSICAL REVIEW B, 1988, 37 (11): : 6547 - 6550
  • [5] COMMENSURABILITY OSCILLATIONS IN MAGNETOPLASMONS OF A DENSITY-MODULATED TWO-DIMENSIONAL ELECTRON-GAS
    CUI, HL
    FESSATIDIS, V
    HORING, NJM
    [J]. PHYSICAL REVIEW LETTERS, 1989, 63 (23) : 2598 - 2601
  • [6] FAR-INFRARED RESPONSE OF ONE-DIMENSIONAL ELECTRONIC SYSTEMS IN SINGLE-LAYERED AND 2-LAYERED QUANTUM WIRES
    DEMEL, T
    HEITMANN, D
    GRAMBOW, P
    PLOOG, K
    [J]. PHYSICAL REVIEW B, 1988, 38 (17): : 12732 - 12735
  • [7] ONE-DIMENSIONAL ELECTRONIC SYSTEMS IN ULTRAFINE MESA-ETCHED SINGLE AND MULTIPLE QUANTUM WELL WIRES
    DEMEL, T
    HEITMANN, D
    GRAMBOW, P
    PLOOG, K
    [J]. APPLIED PHYSICS LETTERS, 1988, 53 (22) : 2176 - 2178
  • [8] ANISOTROPIC PLASMON DISPERSION IN A LATERAL QUANTUM-WIRE SUPERLATTICE
    EGELER, T
    ABSTREITER, G
    WEIMANN, G
    DEMEL, T
    HEITMANN, D
    GRAMBOW, P
    SCHLAPP, W
    [J]. PHYSICAL REVIEW LETTERS, 1990, 65 (14) : 1804 - 1807
  • [9] BULK AND EDGE PLASMONS IN MULTIPLE-STRIPED SUPERLATTICES
    GUMBS, G
    ZHU, X
    [J]. SOLID STATE COMMUNICATIONS, 1989, 70 (03) : 389 - 392
  • [10] INTERSUBBAND RESONANCE IN QUASI ONE-DIMENSIONAL INVERSION CHANNELS
    HANSEN, W
    HORST, M
    KOTTHAUS, JP
    MERKT, U
    SIKORSKI, C
    PLOOG, K
    [J]. PHYSICAL REVIEW LETTERS, 1987, 58 (24) : 2586 - 2589