Now showing items 1-11 of 11

    • Engineering high quality graphene superlattices via ion milled ultra-thin etching masks 

      Barcons Ruiz, David; Sheinfux, Hanan Herzig; Hoffmann, Rebecca; Torre, Iacopo; Agarwal, Hitesh; Kumar, Roshan Krishna; Vistoli, Lorenzo; Taniguchi, Takashi; Watanabe, Kenji; Bachtold, Adrian; Koppens, Frank (2022-11-14)
      Article
      Open Access
      Nanofabrication research pursues the miniaturization of patterned feature size. In the current state of the art, micron scale areas can be patterned with features down to ~30¿nm pitch using electron beam lithography. Here, ...
    • Experimental signatures of the transition from acoustic plasmon to electronic sound in graphene 

      Barcons Ruiz, David; Hesp, Niels; Sheinfux, Hanan Herzig; Ramos Marimón, Carlos; Maissen, Curdin Martin; Principi, Alessandro; Asgari, Reza; Taniguchi, Takashi; Watanabe, Kenji; Polini, Marco; Hillenbrand, Rainer; Torre, Iacopo; Koppens, Frank (2023-09-29)
      Article
      Open Access
      Fermi liquids respond differently to perturbations depending on whether their frequency is higher (collisionlessregime) or lower (hydrodynamic regime) than the interparticle collision rate. This results in a different ...
    • Fast and sensitive terahertz detection using an antenna-integrated graphene pn-junction 

      Castilla, Sebastián; Terrés, Bernat; Autore, Marta; Viti, Leonardo; Li, Jian; Nikitin, Alexey Y.; Vangelidis, Ioannis; Watanabe, Kenji; Taniguchi, Takashi; Lidorikis, Elefterios; Vitiello, Miriam S.; Hillenbrand, Rainer; Tielrooij, Klaas-Jan; Koppens, Frank H. L. (ACS, 2019-03-18)
      Article
      Open Access
      Although the detection of light at terahertz (THz) frequencies is important for a large range of applications, current detectors typically have several disadvantages in terms of sensitivity, speed, operating temperature, ...
    • Highly confined low-loss plasmons in graphene–boron nitride heterostructures 

      Woessner, Achim; Lundeberg, Mark B.; Gao, Yuanda; Principi, Alessandro; Alonso-González, Pablo; Carrega, Matteo; Watanabe, Kenji; Taniguchi, Takashi; Vignale, Giovanni; Polini, Marco; Hone, James; Hillenbrand, Rainer; Koppens, Frank H. L. (Nature Publishing Group, 2014-12-22)
      Article
      Open Access
      Graphene plasmons were predicted to possess simultaneous ultrastrong field confinement and very low damping, enabling new classes of devices for deep-subwavelength metamaterials, single-photon nonlinearities, extraordinarily ...
    • Infrared spectroscopy for diagnosing superlattice minibands in twisted bilayer graphene near the magic angle 

      Li, Geng; Krishna Kumar, Roshan; Stepanov, Petr; Pantaleón, Pierre A.; Zhan, Zhen; Agarwal, Hitesh; Bercher, Adrien; Barrier, Julien; Watanabe, Kenji; Taniguchi, Takashi; Kuzmenko, Alexey B.; Guinea, Francisco; Torre, Iacopo; Koppens, Frank (2024-12-05)
      Article
      Restricted access - publisher's policy
      Twisted bilayer graphene (TBG) represents a highly tunable, strongly correlated electron system. However, understanding the single-particle band structure alone has been challenging due to a lack of spectroscopic measurements ...
    • Nano-imaging photoresponse in a moiré unit cell of minimally twisted bilayer graphene 

      Hesp, Niels; Torre, Iacopo; Barcons Ruiz, David; Sheinfux, Hanan Herzig; Watanabe, Kenji; Taniguchi, Takashi; Kumar, Roshan Krishna; Koppens, Frank (2021-03-12)
      Article
      Open Access
      Graphene-based moiré superlattices have recently emerged as a unique class of tuneable solid-state systems that exhibit significant optoelectronic activity. Local probing at length scales of the superlattice should provide ...
    • Nanoscale Imaging and Control of hexagonal BoronNitride Single Photon Emitters by a Resonant Nano-antenna 

      Palombo Blascetta, Nicola; Liebel, Matz; Lu, Xiaobo; Taniguchi, Takashi; Watanabe, Kenji; Efetov, Dmitri K.; Hulst, Niek F. van (American Chemical Society, 2020-02-13)
      Article
      Restricted access - publisher's policy
      Defect centers in two-dimensional hexagonal boron nitride (hBN) are drawing attention as single photon emitters with high photo-stability at room temperature. With their ultra-high photon-stability, hBN single photon ...
    • Thermoelectric detection and imaging of 1 propagating graphene plasmons 

      Lundeberg, Mark B.; Gao, Yuanda; Woessner, Achim; Tan, Cheng; Alonso-González, Pablo; Watanabe, Kenji; Taniguchi, Takashi; Hone, James; Hillenbrand, Rainer; Koppens, Frank H. L. (Nature, 2016-09-19)
      Article
      Open Access
      Controlling, detecting and generating propagating plasmons by all-electrical means is at the heart of on-chip nano-optical processing1, 2, 3. Graphene carries long-lived plasmons that are extremely confined and controllable ...
    • Tunable and giant valley-selective Hall effect in gapped bilayer graphene 

      Yin, Jianbo; Tan, Cheng; Barcons Ruiz, David; Torre, Iacopo; Watanabe, Kenji; Taniguchi, Takashi; Song, Justin C. W.; Hone, James; Koppens, Frank (2022-03-25)
      Article
      Open Access
      Berry curvature is analogous to magnetic field but in momentum space and is commonly present in materials with nontrivial quantum geometry. It endows Bloch electrons with transverse anomalous velocities to produce Hall-like ...
    • Valley-hybridized gate-tunable 1D exciton confinement in MoSe2 

      Heithoff, Maximilian; Moreno Abajo, Álvaro; Torre, Iacopo; Feuer, Matthew S. G.; Purser, Carola M.; Andolina, Gian Marcello; Calajò, Giuseppe; Watanabe, Kenji; Taniguchi, Takashi; Chang, Darrick E.; Reserbat-Plantey, Antoine; Koppens, Frank (2024-10-21)
      Article
      Restricted access - publisher's policy
      Controlling excitons at the nanoscale in semi-conductor materials represents a formidable challenge in thequantum photonics and optoelectronics fields. Monolayers oftransition metal dichalcogenides (TMDs) offer inherent ...
    • WSe2 as transparent top gate for infrared near-field microscopy 

      Hesp, Niels; Kamper Svendsen, Mark; Watanabe, Kenji; Taniguchi, Takashi; Thygesen, Kristian Sommer; Torre, Iacopo; Koppens, Frank (2022-08-10)
      Article
      Open Access
      Independent control of carrier density and out-of-plane displacement field is essential for accessing novel phenomena in two-dimensional (2D) material heterostructures. While this is achieved with independent top and bottom ...