Yu, Y , Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China.
部门归属:
Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China
英文摘要:
We calculate the conductivity associated with the anomalous propagation of a surface acoustic wave above a two-dimensional electron gas at nu=1/2. Murthy-Shankar's middle representation is adopted, and a contribution to the response functions beyond the random-phase approximation is taken into account. We give a phenomenological fit for the effective mass of a composite fermion, with experimental data for the anomalous propagation of surface acoustic wave at nu=1/2, and find that the phenomenological value of the effective mass is several times larger than the theoretical value m(th)*=6 epsilon/e(2)l(1/2) derived from the Hartree-Fock approximation. We compare the phenomenological value of the composite fermion effective mass with that measured in experiments for the activation energy and the Shubnikov-de Haas oscillations. It is found that the comparison is fairly good.
Yu, Y,Su, ZB. Effective mass of composite fermions: A phenomenological fit to the anomalous propagation of a surface acoustic wave[J]. PHYSICAL REVIEW B,2000,61(4):2855-2862.
