Excitation spectrum and effective mass of the even-fraction quantum hall liquid
Phys Rev Lett
; 84(17): 3942-5, 2000 Apr 24.
Article
em En
| MEDLINE
| ID: mdl-11019245
ABSTRACT
To probe the nature of the even-fraction quantum Hall system, we have investigated the low-lying excitation spectrum by exact diagonalization for finite systems. We have found (i) a striking one-to-one correspondence (i.e., a shell structure) between the spectrum and those for free (composite) fermions, (ii) a surprisingly straight scaling plot for the excitation energy that gives a zero gap (metal) in the thermodynamic limit, (iii) the effective mass evaluated from the scaling becoming heavier for nu = 1/2,1/4,1/6, but (iv) some deviations from the single-mode or the Hartree-Fock composite fermion approximation.
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En
Ano de publicação:
2000
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Article