Magnetotunneling as a Probe of Luttinger-Liquid Behavior

Details Magnetotunneling as a Probe of Luttinger-Liquid Behavior Magnetotunneling as a Probe of Luttinger-Liquid Behavior

1999-07-29

arxiv.org/abs/cond-mat/9907459v1

Physics

Condensed Matter

Strongly Correlated Electrons

Accepted for publication in Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.83.1203

A novel method for detecting Luttinger-liquid behavior is proposed. The idea is to measure the tunneling conductance between a quantum wire and a parallel two-dimensional electron system as a function of both the potential difference between them, $V$, and an in-plane magnetic field, $B$. We show that the two-parameter dependence on $B$ and $V$ allows for a determination of the characteristic dependence on wave vector $q$ and frequency $\omega$ of the {\it spectral function}, $A_{\rm LL}(q,\omega)$, of the quantum wire. In particular, the separation of spin and charge in the Luttinger liquid should manifest itself as singularities in the $I$-$V$-characteristic. The experimental feasibility of the proposal is discussed.

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