Artículos de revistas
Nernst Effect And Dimensionality In The Quantumlimit
Registro en:
Nature Physics. , v. 6, n. 1, p. 26 - 29, 2010.
17452473
10.1038/nphys1437
2-s2.0-73549086313
Autor
Zhu Z.
Yang H.
Fauque B.
Kopelevich Y.
Behnia K.
Institución
Resumen
The Nernst effect has recently emerged as a very sensitive, yet poorly understood, probe of electron organization in solids. Graphene, a single layer of carbon atoms set in a honeycomb lattice, embeds a two-dimensional gas of massless electrons and hosts a particular version of the quantum Hall effect. Recent experimental investigations of its thermoelectric response are in agreement with the theory conceived for a two-dimensional electron system in the quantum Hall regime. Here, we report on a study of graphite, a macroscopic stack of graphene layers, which establishes a fundamental link between the dimensionality of an electronic system and its Nernst response. In striking contrast with the single-layer case, the Nernst signal sharply peaks whenever a Landau level meets the Fermi level. Thus, the degrees of freedom provided by finite interlayer coupling lead to an enhanced thermoelectric response in the vicinity of the quantum limit. 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