Results 41 to 50 of about 360,605 (265)

Terahertz Conductivity of Twisted Bilayer Graphene

Physical Review Letters, 2013
Using terahertz time-domain spectroscopy, the real part of optical conductivity [$σ_{1}(ω)$] of twisted bilayer graphene was obtained at different temperatures (10 -- 300 K) in the frequency range 0.3 -- 3 THz. On top of a Drude-like response, we see a strong peak in $σ_{1} (ω)$ at $\sim$2.7 THz.
Zou, X., Shang, J., Leaw, J., Luo, Z., Luo, L., La-O-Vorakiat, C., Cheng, L., Cheong, S.A., Su, H., Zhu, J.-X., Liu, Y., Loh, K.P., Castro Neto, A.H., Yu, T., Chia, E.E.M.   +14 more
openaire   +6 more sources

Fabrication and ab initio study of downscaled graphene nanoelectronic devices [PDF]

, 2012
In this paper we first present a new fabrication process of downscaled graphene nanodevices based on direct milling of graphene using an atomic-size helium ion beam. We address the issue of contamination caused by the electron-beam lithography process to
Marek E. Schmidt, Harvey N. Rutt, Moktadir, Zakaria, Tsuchiya, Yoshishige, Manoharan Muruganathan, Shuojin Hang, Darren M. Bagnall, Harold Chong, Hiroshi Mizuta, Kalhor, Nima, Chi, Dam Hieu, Cuong, Nguyen Tien, Boden, Stuart A., Chong, Harold, Mizuta, Hiroshi, Rutt, Harvey N., Dam Hieu Chi, Schmidt, Marek E., Stuart A. Boden, Zakaria Moktadir, Nima Kalhor, Yoshishige Tsuchiya, Bagnall, Darren M., Muruganathan, Manoharan, Nguyen Tien Cuong, Otsuka, Nobuo, Nobuo Otsuka, Hang, Shuojin   +27 more
core   +1 more source

Transport signatures of Van Hove singularities in mesoscopic twisted bilayer graphene

Physical Review Research, 2022
Magic-angle twisted bilayer graphene exhibits quasiflat low-energy bands with Van Hove singularities close to the Fermi level. These singularities play an important role in the exotic phenomena observed in this material, such as superconductivity and ...
Aleksander Sanjuan Ciepielewski, Jakub Tworzydło, Timo Hyart, Alexander Lau   +3 more
doaj   +1 more source

Junctions and Superconducting Symmetry in Twisted Bilayer Graphene

Physical Review Letters, 2023
5 pages, 4 figures and supplementary material.
Héctor Sainz-Cruz, Pierre A. Pantaleón, Võ Tiến Phong, Alejandro Jimeno-Pozo, Francisco Guinea   +4 more
openaire   +5 more sources

Intrinsic nonmagnetic ϕ_{0} Josephson junctions in twisted bilayer graphene

Physical Review Research, 2023
Recent experiments have demonstrated the possibility to design highly controllable junctions on magic angle twisted bilayer graphene, enabling the test of its superconducting transport properties.
M. Alvarado, P. Burset, A. Levy Yeyati
doaj   +1 more source

Bistritzer–MacDonald dynamics in twisted bilayer graphene

Journal of Mathematical Physics, 2023
The Bistritzer–MacDonald (BM) model, introduced by Bistritzer and MacDonald [Proc. Natl. Acad. Sci. U. S. A. 108, 12233–12237 (2011); arXiv:1009.4203], attempts to capture electronic properties of twisted bilayer graphene (TBG), even at incommensurate twist angles, by using an effective periodic model over the bilayer moiré pattern.
Alexander B. Watson, Tianyu Kong, Allan H. MacDonald, Mitchell Luskin   +3 more
openaire   +3 more sources

On Dielectric Screening in Twisted Double Bilayer Graphene [PDF]

Journal of the Physical Society of Japan, 2021
We have studied the dielectric screening of electric field which is induced by a gate voltage in twisted double bilayer graphene by using a sample with a mismatch angle of about 5 degrees. In low temperature magnetotransport measurements, quantum oscillations of magnetoresistance originating from two bands with different carrier density were observed ...
Fumiya Mukai, Kota Horii, Nazuna Hata, Ryoya Ebisuoka, Kenji Watanabe, Takashi Taniguchi, Ryuta Yagi   +6 more
openaire   +2 more sources

Short Versus Long Range Exchange Interactions in Twisted Bilayer Graphene

Advanced Physics Research, 2023
This study discusses the effect of long‐range interactions within the self‐consistent Hartree‐Fock (HF) approximation in comparison to short‐range atomic Hubbard interactions on the band structure of twisted bilayer graphene (TBG) at charge neutrality ...
Alejandro Jimeno‐Pozo, Zachary A. H. Goodwin, Pierre A. Pantaleón, Valerio Vitale, Lennart Klebl, Dante M. Kennes, Arash A. Mostofi, Johannes Lischner, Francisco Guinea   +8 more
doaj   +1 more source

Breakdown of the Interlayer Coherence in Twisted Bilayer Graphene [PDF]

Physical Review Letters, 2013
Coherent motion of the electrons in the Bloch states is one of the fundamental concepts of the charge conduction in solid state physics. In layered materials, however, such a condition often breaks down for the interlayer conduction, when the interlayer coupling is significantly reduced by e.g. large interlayer separation.
Youngwook Kim, Hoyeol Yun, Seung-Geol Nam, Minhyeok Son, Dong Su Lee, Dong Chul Kim, Seo, S, Choi, HC, Hu-Jong Lee, Sang Wook Lee, Jun Sung Kim   +10 more
openaire   +4 more sources

The shear mode of multi-layer graphene [PDF]

, 2012
The quest for materials capable of realizing the next generation of electronic and photonic devices continues to fuel research on the electronic, optical and vibrational properties of graphene.
Han, W.P., Tan, P.H, Wang, Y. F., A. C. Ferrari, Marzari, Nicola, Wang, YF, Ferrari, A.C, Bonini, Nicola, Tan, P. H., Wu, Z. H., N. Bonini, W. P. Han, Zhao, W.J, Y. F. Wang, Han, WP, Zhao, WJ, ,, Wu, Z.H., H. Wang, A. Lombardo, Chang, K, Savini, G, Han, W. P., Pugno, Nicola, Pugno, Nicola M., Z. H. Wu, Ferrari, Andrea C., Bonini, N, Tan, P.H., Wang, H., K. Chang, N. Marzari, Pugno, N, Ferrari, AC, Zhao, W.J., Savini, G., Wang, H, Lombardo, A, Ferrari, A. C., Tan, PH, Wu, ZH, P. H. Tan, Wu, Z.H, Zhao, W. J., Pugno, N., Bonini, N., W. J. Zhao, Han, W.P, Wang, Y.F., Chang, W., Marzari, N., Chang, K., Wang, Y.F, G. Savini, Lombardo, A., Marzari, N   +55 more
core   +2 more sources