Observation of chirality transition of quasiparticles at stacking solitons in trilayer graphene

Yin, Long-Jing; Wang, Wen-Xiao; Zhang, Yu; Ou, Yang-Yang; Zhang, Hao-Ting; Shen, Cai-Yun; He, Lin

doi:10.1103/physrevb.95.081402

Cited by 19 publications

(21 citation statements)

References 43 publications

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“…The ABC stacking order and high-quality of the TLG sample can be unambiguously verified by LL spectroscopy measurements under various perpendicular magnetic fields B [21,29]. Figure 1(d) shows the LL spectroscopy for the ABC TLG measured from 0 -15 T. A series of well-separated LLs are resolved both in the electron and hole sides, suggesting that the TLG is effectively decoupled from the substrate and has a very highquality [30].…”

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confidence: 68%

High-Magnetic-Field Tunneling Spectra of ABC -Stacked Trilayer Graphene on Graphite

Yin

Shi

et al. 2019

Phys. Rev. Lett.

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ABC-stacked trilayer graphene (TLG) are predicted to exhibit novel many-body phenomena due to the existence of almost dispersionless flat-band structures near the charge neutrality point (CNP). Here, using high magnetic field scanning tunneling microscopy, we present Landau Level (LL) spectroscopy measurements of high-quality ABC-stacked TLG. We observe an approximately linear magneticfield-scaling of the valley splitting and orbital splitting in the ABC-stacked TLG. Our experiment indicates that the valley splitting decreases dramatically with increasing the LL index. When the lowest LL is partially filled, we find an obvious enhancement of the orbital splitting, attributing to strong many-body effects. Moreover, we observe linear energy scaling of the inverse lifetime of quasiparticles, providing an additional evidence for the strong electron-electron interactions in the ABC-stacked TLG. These results imply that interesting broken-symmetry states and novel electron correlation effects could emerge in the ABC-stacked TLG in the presence of high magnetic fields.

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confidence: 68%

High-Magnetic-Field Tunneling Spectra of ABC -Stacked Trilayer Graphene on Graphite

Yin

Shi

et al. 2019

Phys. Rev. Lett.

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“…21(d). The layer polarization of the two lowest LLs, LL (0,1,2,+) and LL (0,1,2,−) , depends on the sign of electric polarity (or the sign of the energy gap) of the ABC trilayer, and we observed both positive and negative layer-polarized LL (0,1,2,+) and LL (0,1,2,−) in different trilayers [150]. Theoretically, topological edge modes are expected to be observed in such trilayer domain walls [154], which separates opposite gated ABC-stacked domains, as demonstrated in the AB-BA domain walls of bilayer graphene [73].…”

Section: -16mentioning

confidence: 74%

“…Owing to the varied interlayer stacking around the domain walls, the AB-BA and ABA-ABC stacking solitons can be clearly visualized by STM [73,150], as shown in Figs. 15(c) and (d), by STEM [147] or by infrared nanoscopy [151].…”

Section: Stacking Domain Wall Systemmentioning

confidence: 99%

“…For example, the region of the transition between AB-and BA-stacked bilayer graphene domains forms an AB-BA domain wall [147][148][149], and similarly, graphene trilayers have ABA-ABC stacking solitons [150]. To realize such domain walls, one graphene layer should be shifted one C-C bond length along the armchair direction with respective to the adjacent layers (see Fig.…”

Section: Stacking Domain Wall Systemmentioning

confidence: 99%

“…In the stacking domainwall region, the LLs of both the l = 1&2 and l = 3 chiral Reproduced from Ref. [150].…”

Section: -16mentioning

confidence: 99%

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Landau quantization of Dirac fermions in graphene and its multilayers

et al. 2017

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When electrons are confined in a two-dimensional (2D) system, typical quantum-mechanical phenomena such as Landau quantization can be detected. Graphene systems, including the single atomic layer and few-layer stacked crystals, are ideal 2D materials for studying a variety of quantum-mechanical problems. In this article, we review the experimental progress in the unusual Landau quantized behaviors of Dirac fermions in monolayer and multilayer graphene by using scanning tunneling microscopy (STM) and scanning tunneling spectroscopy (STS). Through STS measurement of the strong magnetic fields, distinct Landau-level spectra and rich level-splitting phenomena are observed in different graphene layers. These unique properties provide an effective method for identifying the number of layers, as well as the stacking orders, and investigating the fundamentally physical phenomena of graphene. Moreover, in the presence of a strain and charged defects, the Landau quantization of graphene can be significantly modified, leading to unusual spectroscopic and electronic properties.

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Klein Tunneling through Double Barrier in ABC‐Trilayer Graphene

2022

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Klein tunneling and conductance for Dirac fermions in ABC-stacked trilayer graphene through symmetric and asymmetric double potential barrier are investigated. This was done by using the continuum model of two and six-bands. The numerical results show that the transport is sensitive to the height, the width, and the distance between the two barriers. It is found that the Klein paradox at normal incidence (k y = 0) and resonant features at k y ≠ 0 in the transmission result from resonant electron states in the wells or hole states in the barriers. It is shown that such features strongly influence the ballistic conductance of the structures. IntroductionGenerally, graphene [1][2][3][4] is a 2D lattice of carbon atoms arranged in hexagonal geometry. Its stacking can be realized in different methods to engineer multi-layered graphene showing various physical properties. Typical examples of stacking includes order, Bernal (AB), and rhombohedral stacking (ABC). [5][6][7][8][9][10] In the first all carbon atoms of each layer are well-aligned, while the second and third have cycle periods composed, respectively, of two and three layers of non-aligned graphene. It was shown that the band structure, Klein tunneling, band gap, transport and optical properties of graphene depend on the way how its layers are stacked [5,9,[11][12][13][14][15][16][17][18][19][20][21][22] and the applied external sources. [5,9,19,[23][24][25][26][27][28][29][30][31][32][33] Recently, trilayer graphene (TLG) has attracted more attention. [15,19,26,29,31,[34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49] It has two distinct allotropes: the Bernal (ABA) and rhombohedral (ABC) stackings. ABA has atoms of the top layer lie exactly on top of the bottom layer. It possess a dispersion relation as summation of the linear and quadratic dispersions corresponding to the single layer and bilayer, respectively. It has no opening gap under applied external electric field. [50] As for ABC, the atoms of one of the sublattices of topmost layer lie above the center of the hexagons of bottom layer.

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Observation of chirality transition of quasiparticles at stacking solitons in trilayer graphene

Cited by 19 publications

References 43 publications

High-Magnetic-Field Tunneling Spectra of ABC -Stacked Trilayer Graphene on Graphite

High-Magnetic-Field Tunneling Spectra of ABC -Stacked Trilayer Graphene on Graphite

Landau quantization of Dirac fermions in graphene and its multilayers

Klein Tunneling through Double Barrier in ABC‐Trilayer Graphene

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