Interface states and anomalous quantum oscillations in hybrid graphene structures

被引：24

作者：

Puls, C. P. ^{[1
]}

Staley, N. E. ^{[1
]}

Liu, Y. ^{[1
]}

机构：

[1] Penn State Univ, Dept Phys, University Pk, PA 16802 USA

来源：

PHYSICAL REVIEW B | 2009年 / 79卷 / 23期

关键词：

EPITAXIAL GRAPHENE; BERRYS PHASE; FIELD;

D O I：

10.1103/PhysRevB.79.235415

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report the first experimental study of continuous sheets of graphene possessing both one-layer and two-layer portions. In a bulk hybrid structure featuring two large-area one-layer and two-layer graphene areas, our measurements in a magnetic field revealed the formation of two independent sets of Landau levels with drastically different energy scales and level spacings as expected as well as new features in the quantum oscillation originating from the interface and device configuration. In edge hybrids featuring large two-layer graphene with two narrow one-layer graphene edges, we observed an anomalous suppression in the amplitude of the quantum oscillation of two-layer graphene. The suppression is interpreted as a consequence of the locking of the one-layer and two-layer graphene Fermi energies, the associated charge imbalance, and the emergence of chiral interface states, whose physical consequences are yet to be fully understood.

引用

页数：6

共 28 条

[1] Quantized transport in graphene p-n junctions in a magnetic field [J].

Abanin, D. A. ;

Levitov, L. S. .

SCIENCE, 2007, 317 (5838) :641-643

[2] Conformal invariance and shape-dependent conductance of graphene samples [J].

Abanin, Dmitry A. ;

Levitov, Leonid S. .

PHYSICAL REVIEW B, 2008, 78 (03)

[3] Edge states in graphene in magnetic fields: A specialty of the edge mode embedded in the n=0 Landau band [J].

Arikawa, Mitsuhiro ;

Hatsugai, Yasuhiro ;

Aoki, Hideo .

PHYSICAL REVIEW B, 2008, 78 (20)

[4] Electronic confinement and coherence in patterned epitaxial graphene [J].

Berger, Claire ;

Song, Zhimin ;

Li, Xuebin ;

Wu, Xiaosong ;

Brown, Nate ;

Naud, Cecile ;

Mayou, Didier ;

Li, Tianbo ;

Hass, Joanna ;

Marchenkov, Atexei N. ;

Conrad, Edward H. ;

First, Phillip N. ;

de Heer, Wait A. .

SCIENCE, 2006, 312 (5777) :1191-1196

[5] Biased bilayer graphene: Semiconductor with a gap tunable by the electric field effect [J].

Castro, Eduardo V. ;

Novoselov, K. S. ;

Morozov, S. V. ;

Peres, N. M. R. ;

Dos Santos, J. M. B. Lopes ;

Nilsson, Johan ;

Guinea, F. ;

Geim, A. K. ;

Castro Neto, A. H. .

PHYSICAL REVIEW LETTERS, 2007, 99 (21)

[6] Localized states at zigzag edges of multilayer graphene and graphite steps [J].

Castro, Eduardo V. ;

Peres, N. M. R. ;

dos Santos, J. M. B. Lopes .

EPL, 2008, 84 (01)

[7] The electronic properties of graphene [J].

Castro Neto, A. H. ;

Guinea, F. ;

Peres, N. M. R. ;

Novoselov, K. S. ;

Geim, A. K. .

REVIEWS OF MODERN PHYSICS, 2009, 81 (01) :109-162

[8] Charge transport and inhomogeneity near the minimum conductivity point in graphene [J].

Cho, Sungjae ;

Fuhrer, Michael S. .

PHYSICAL REVIEW B, 2008, 77 (08)

[9] Epitaxial graphene [J].

de Heer, Walt A. ;

Berger, Claire ;

Wu, Xiaosong ;

First, Phillip N. ;

Conrad, Edward H. ;

Li, Xuebin ;

Li, Tianbo ;

Sprinkle, Michael ;

Hass, Joanna ;

Sadowski, Marcin L. ;

Potemski, Marek ;

Martinez, Gerard .

SOLID STATE COMMUNICATIONS, 2007, 143 (1-2) :92-100

[10] Chemical Doping and Electron-Hole Conduction Asymmetry in Graphene Devices [J].

Farmer, Damon B. ;

Golizadeh-Mojarad, Roksana ;

Perebeinos, Vasili ;

Lin, Yu-Ming ;

Tulevski, George S. ;

Tsang, James C. ;

Avouris, Phaedon .

NANO LETTERS, 2009, 9 (01) :388-392

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