Repulsion of single-well fundamental edge magnetoplasmons in double quantum wells

Article

关键词: 2-DIMENSIONAL ELECTRON-GAS;    HALL-EFFECT REGIME;    MAGNETIC-FIELDS;    EXCITATIONS;    CHANNELS;    STATES;    WAVES;    DISPERSION;    DENSITY;    WIRES;   

DOI  :  10.1103/PhysRevB.59.2063

来源: SCIE

【 摘 要 】

A microscopic treatment of fundamental edge magnetoplasmons (EMP's) along the edge of a double quantum well (DQW) is presented for strong magnetic fields, low temperatures, and total filling factor nu=2. It is valid for lateral confining potentials that Landau-level flattening can be neglected. The cyclotron and Zeeman energies are assumed larger than the DQW energy splitting root Delta(2)+4T(2) where Delta is the splining of the isolated wells and T the tunneling matrix element. Using a random-phase approximation, which includes local and nonlocal contributions to the current density, it is shown that for negligible tunnel coupling 2T much less than Delta the interwell Coulomb coupling leads to two DQW fundamental EMP's, which are strongly renormalized in comparison with the decoupled, single-well fundamental EMP. These DQW modes can be modified further upon varying the interwell distance d, along the z axis, and/or the separation of the wells' edges Delta y along the y axis. The charge profile of the fast and slow DQW mode varies, respectively, in an acoustic and optical manner along the y axis and is not smooth on the l(0) scale. For strong tunneling Delta less than or similar to 2T these DQW modes are essentially modified when Delta is changed by applying a transverse electric field to the DQW. [S0163-1829(99)01603-3].

【 授权许可】

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