From laterally modulated two-dimensional electron gas towards artificial graphene

被引：59

作者：

Nadvornik, L. ^{[1
,2
]}

Orlita, M. ^{[1
,2
,4
]}

Goncharuk, N. A. ^{[3
]}

Smrcka, L. ^{[2
]}

Novak, V. ^{[2
]}

Jurka, V. ^{[2
]}

Hruska, K. ^{[2
]}

Vyborny, Z. ^{[2
]}

Wasilewski, Z. R. ^{[5
]}

Potemski, M. ^{[4
]}

Vyborny, K. ^{[2
,6
]}

机构：

[1] Charles Univ Prague, Fac Math & Phys, CR-12116 Prague 2, Czech Republic

[2] ASCR, Inst Phys, Vvi, Prague 16253 6, Czech Republic

[3] ABB Sro, Semicond, R&D, Prague 14221, Czech Republic

[4] CNRS UJF UPS INSA, Lab Natl Champs Magnet Intenses, F-38042 Grenoble, France

[5] Natl Res Council Canada, Inst Microstruct Sci, Ottawa, ON K1A 0R6, Canada

[6] SUNY Buffalo, Dept Phys, Buffalo, NY 14260 USA

来源：

NEW JOURNAL OF PHYSICS | 2012年 / 14卷

基金：

美国国家科学基金会;

关键词：

MASSLESS DIRAC FERMIONS; MAGNETORESISTANCE OSCILLATIONS; COLLECTIVE EXCITATIONS; MAGNETOTRANSPORT; FABRICATION; ABSORPTION; SYSTEMS; ATOMS;

D O I：

10.1088/1367-2630/14/5/053002

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Cyclotron resonance has been measured in far-infrared transmission of GaAs/AlxGa1-xAs heterostructures with an etched trigonal lateral superlattice intended to mimic graphene with lattice constant of the order of 100 nm (about 1000 times larger than that of natural graphene). Nonlinear dependence of the resonance position on magnetic field was observed, as well as its splitting into several modes. Our explanation, based on a perturbative calculation, describes the observed phenomena as a weak effect of the lateral potential on the two-dimensional electron gas. Using this approach, we found a correlation between parameters of the lateral patterning and the created effective potential and obtained thus insights into how the electronic miniband structure has been tuned. The miniband dispersion was calculated using a simplified model and allowed us to formulate four basic criteria that have to be satisfied to reach graphene-like physics in such systems.

引用

页数：16

共 53 条

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