Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-03-02
Phys. Rev. B, 65 (2002) 241102.
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 .eps figures
Scientific paper
10.1103/PhysRevB.65.241102
Effects of the electron-electron interaction on tunneling into a metal in ultra-high magnetic field (ultra-quantum limit) are studied. The range of the interaction is found to have a decisive effect both on the nature of the field-induced instability of the ground state and on the properties of the system at energies above the corresponding gap. For a short-range repulsive interaction, tunneling is dominated by the renormalization of the coupling constant, which leads eventually to the charge-density wave instability. For a long-range interaction, there exists an intermediate energy range in which the conductance obeys a power-law scaling form, similar to that of a 1D Luttinger liquid. The exponent is magnetic-field dependent, and more surprisingly, may be positive or negative, i. e., interactions may either suppress or enhance the tunneling conductance compared to its non-interacting value. At energies near the gap, scaling breaks down and tunneling is again dominated by the instability, which in this case is an (anisotropic) Wigner crystal instability.
Glazman Leonid I.
Maslov Dmitrii L.
Tsai Shan-Wen
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