Máté Kedves, Tamás Pápai, Gergő Fülöp, Kenji Watanabe, Takashi Taniguchi, Péter Makk, and Szabolcs Csonka
Phys. Rev. Research 6, 033143 (2024) – Published 6 August 2024
Self-heating effects are experimentally investigated in a graphene multiterminal Josephson junction and simulated using a resistively shunted Josephson junction network model. Self-heating is also shown to significantly influence the switching dynamics of this multiterminal system.
Jun-Ang Wang, Mohamed Assili, and Panagiotis Kotetes
Phys. Rev. Research 6, L022053 (2024) – Published 6 June 2024
The superfluid stiffness and the Josephson quantum capacitance of chiral-symmetric superconducting Dirac semimetals are shown to become quantized in nonuniversal units due to nontrivial topology. The topological constraint imposed on the total superfluid stiffness further leads to the here-termed quantum admittance effect, that is, the universal topological quantization of the admittance modulus when the system is subject to an ac perturbation with a frequency tuned at the absorption edge.
Juan Salvador-Sánchez, Luis M. Canonico, Ana Pérez-Rodríguez, Tarik P. Cysne, Yuriko Baba, Vito Clericò, Marc Vila, Daniel Vaquero, Juan Antonio Delgado-Notario, José M. Caridad, Kenji Watanabe, Takashi Taniguchi, Rafael A. Molina, Francisco Domínguez-Adame, Stephan Roche, Enrique Diez, Tatiana G. Rappoport, and Mario Amado
Phys. Rev. Research 6, 023212 (2024) – Published 28 May 2024
Phys. Rev. Research 6, L022025 (2024) – Published 30 April 2024
In the helical twisted trilayer graphene with equal twist angles, a hexagonal mosaic pattern spanning the moiré-of-moiré length scale and featuring alternating 1 Chern numbers in each block is revealed.
Phys. Rev. Research 6, L012059 (2024) – Published 13 March 2024
A nonlinear dynamical Hall effect unique to layered materials with chiral symmetry, which is driven by the joint action of in-plane and time variation of out-of-plane ac fields, is proposed. It has a band geometric origin in a mixed quantum metric characteristic of interlayer coherent electron wave functions.
Chuyao Tong, Annika Kurzmann, Rebekka Garreis, Kenji Watanabe, Takashi Taniguchi, Thomas Ihn, and Klaus Ensslin
Phys. Rev. Research 6, L012006 (2024) – Published 11 January 2024
In bilayer graphene, a comprehensive catalog of double quantum dot Pauli blockade for up to four carriers per dot is established, revealing a more complex transition structure than in conventional systems due to the involvement of both spin and valley pseudospin degrees of freedom. This result provides new possibilities for spin and valley qubit manipulation and control in bilayer graphene.
Ammon Fischer, Lennart Klebl, Jonas B. Profe, Alexander Rothstein, Lutz Waldecker, Bernd Beschoten, Tim O. Wehling, and Dante M. Kennes
Phys. Rev. Research 6, L012003 (2024) – Published 8 January 2024
ABCB tetralayer graphene features valley-local flat bands and van Hove singularities due to intrinsic crystal fields. This strengthens a variety of correlated states including ferri- and ferromagnetic and superconducting phases at low densities.
Lev V. Ginzburg, Yuze Wu, Marc P. Röösli, Pedro Rosso Gomez, Rebekka Garreis, Chuyao Tong, Veronika Stará, Carolin Gold, Khachatur Nazaryan, Serhii Kryhin, Hiske Overweg, Christian Reichl, Matthias Berl, Takashi Taniguchi, Kenji Watanabe, Werner Wegscheider, Thomas Ihn, and Klaus Ensslin
Phys. Rev. Research 5, 043088 (2023) – Published 26 October 2023
Phys. Rev. Research 5, L032033 (2023) – Published 11 September 2023
Chiral pairing in magic-angle twisted bilayer graphene is shown to manifest in the appearance of an anomalous Josephson effect ( behavior) without requiring any magnetic materials or fields. Such behavior arises from the combination of chiral pairing and nontrivial topology, which can effectively break inversion symmetry.
Bartosz Szczefanowicz, Takuya Kuwahara, Tobin Filleter, Andreas Klemenz, Leonhard Mayrhofer, Roland Bennewitz, and Michael Moseler
Phys. Rev. Research 5, L012049 (2023) – Published 30 March 2023
High mechanical load on bilayer graphene causes intermittent covalent bonds between the graphene layers. This transition from 2D to 3D bonding extends to a sliding silica tip and limits the extraordinary lubrication offered by the 2D material graphene.
