Results 21 to 30 of about 360,605 (265)

Graphene Bilayer with a Twist: Electronic Structure [PDF]

Physical Review Letters, 2007
Electronic properties of bilayer and multilayer graphene have generally been interpreted in terms of AB or Bernal stacking. However, it is known that many types of stacking defects can occur in natural and synthetic graphite; rotation of the top layer is often seen in scanning tunneling microscopy (STM) studies of graphite.
Santos, J. M. B. Lopes dos, Peres, N. M. R., Neto, A. H. Castro   +2 more
openaire   +3 more sources

Chiral Tunneling in a Twisted Graphene Bilayer [PDF]

Physical Review Letters, 2013
The perfect transmission in graphene monolayer and the perfect reflection in Bernal graphene bilayer for electrons incident in the normal direction of a potential barrier are viewed as two incarnations of the Klein paradox. Here we show a new and unique incarnation of the Klein paradox. Owing to the different chiralities of the quasiparticles involved,
He, Wen-Yu, Chu, Zhao-Dong, He, Lin
openaire   +3 more sources

Quantum twisting microscopy of phonons in twisted bilayer graphene. [PDF]

Nature
The coupling between electrons and phonons is one of the fundamental interactions in solids, underpinning a wide range of phenomena, such as resistivity, heat conductivity and superconductivity. However, direct measurements of this coupling for individual phonon modes remain a substantial challenge.
Birkbeck J, Xiao J, Inbar A, Taniguchi T, Watanabe K, Berg E, Glazman L, Guinea F, von Oppen F, Ilani S.   +9 more
europepmc   +5 more sources

Topological piezoelectric response in moiré graphene systems

Physical Review Research, 2022
We theoretically study the piezoelectric effects in moirè graphene systems. Since the strain couples to the electrons in the system as an effective vector field, which has opposite signs for the K and K^{′} valleys of graphene, its effects on the two ...
Ran Peng, Jianpeng Liu
doaj   +1 more source

Understanding symmetry breaking in twisted bilayer graphene from cluster constraints

Physical Review Research, 2023
Twisted bilayer graphene is an exciting platform for exploring correlated quantum phases, extremely tunable with respect to both the single-particle bands and the interaction profile of electrons. Here, we investigate the phase diagram of twisted bilayer
Nikita Astrakhantsev, Glenn Wagner, Tom Westerhout, Titus Neupert, Mark H. Fischer   +4 more
doaj   +1 more source

Stacking-dependent band gap and quantum transport in trilayer graphene [PDF]

, 2011
Graphene is an extraordinary two-dimensional (2D) system with chiral charge carriers and fascinating electronic, mechanical and thermal properties. In multilayer graphene, stacking order provides an important yet rarely explored degree of freedom for ...
Bockrath, M, Koshino, Mikito, Smirnov, D, Lau, C N, Aykol, M, McCann, Edward, Cronin, S B, Liu, G, Jing, L, Lee, Y, Velasco Jr, J, Tran, D, Bao, W, Standley, B   +13 more
core   +5 more sources

Optical-phonon resonances with saddle-point excitons in twisted-bilayer graphene [PDF]

, 2014
Twisted-bilayer graphene (tBLG) exhibits van Hove singularities in the density of states that can be tuned by changing the twisting angle θ. A θ-defined tBLG has been produced and characterized with optical reflectivity and resonance Raman scattering ...
Kasperczyk, Mark, Novotny, Lukas, Aravind Vijayaraghavan, Jorio, Ado, Clark, Nick; id_orcid, Mark Kasperczyk, Clark, Nick, Nick Clark, Vijayaraghavan, Aravind; id_orcid, Neu, Elke, Patrick Maletinsky, Ado Jorio, Novotny, Lukas; id_orcid, Vijayaraghavan, Aravind, Elke Neu, Maletinsky, Patrick, Lukas Novotny   +16 more
core   +1 more source

Intrinsic superflat bands in general twisted bilayer systems

Light: Science & Applications, 2022
Twisted bilayer systems with discrete magic angles, such as twisted bilayer graphene featuring moiré superlattices, provide a versatile platform for exploring novel physical properties.
Hongfei Wang, Shaojie Ma, Shuang Zhang, Dangyuan Lei   +3 more
doaj   +1 more source

Cascade of transitions in twisted and non-twisted graphene layers within the van Hove scenario

npj Quantum Materials, 2022
Motivated by measurements of compressibility and STM spectra in twisted bilayer graphene, we analyze the pattern of symmetry breaking for itinerant fermions near a van Hove singularity. Making use of an approximate SU(4) symmetry of the Landau functional,
Dmitry V. Chichinadze, Laura Classen, Yuxuan Wang, Andrey V. Chubukov   +3 more
doaj   +1 more source

Spontaneous time-reversal symmetry breaking in twisted double bilayer graphene

Nature Communications, 2022
Twisted double bilayer graphene (tDBG) comprises two Bernal-stacked bilayer graphene sheets with a twist between them. Here, the authors report a strong anomalous Hall effect in the correlated-metal regime of tDBG, indicating time reversal symmetry ...
Manabendra Kuiri, Christopher Coleman, Zhenxiang Gao, Aswin Vishnuradhan, Kenji Watanabe, Takashi Taniguchi, Jihang Zhu, Allan H. MacDonald, Joshua Folk   +8 more
doaj   +1 more source