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  • 1
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    Negative Coulomb Drag in Double Bilayer Graphene (2016)
    American Physical Society (APS)
    Details
    Publication Date: 2016-07-19
    Description: Author(s): J. I. A. Li, T. Taniguchi, K. Watanabe, J. Hone, A. Levchenko, and C. R. Dean Unusual interactions between charges have been observed in two closely separated graphene bilayers, a promising system in which to create a condensate of electron-hole pairs. [Phys. Rev. Lett. 117, 046802] Published Mon Jul 18, 2016
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
    Published by American Physical Society (APS)
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  • 2
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    Specular interband Andreev reflections at van der Waals interfaces between graphene and NbSe2 (2016)
    Springer Nature
    Details
    Publication Date: 2016-04-02
    Description: Nature Physics 12, 328 (2016). doi:10.1038/nphys3583 Authors: D. K. Efetov, L. Wang, C. Handschin, K. B. Efetov, J. Shuang, R. Cava, T. Taniguchi, K. Watanabe, J. Hone, C. R. Dean & P. Kim Electrons incident from a normal metal onto a superconductor are reflected back as holes—a process called Andreev reflection. In a normal metal where the Fermi energy is much larger than a typical superconducting gap, the reflected hole retraces the path taken by the incident electron. In graphene with low disorder, however, the Fermi energy can be tuned to be smaller than the superconducting gap. In this unusual limit, the holes are expected to be reflected specularly at the superconductor–graphene interface owing to the onset of interband Andreev processes, where the effective mass of the reflected holes changes sign. Here we present measurements of gate-modulated Andreev reflections across the low-disorder van der Waals interface formed between graphene and the superconducting NbSe2. We find that the conductance across the graphene–superconductor interface exhibits a characteristic suppression when the Fermi energy is tuned to values smaller than the superconducting gap, a hallmark for the transition between intraband retro Andreev reflections and interband specular Andreev reflections.
    Print ISSN: 1745-2473
    Electronic ISSN: 1745-2481
    Topics: Physics
    Published by Springer Nature
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  • 3
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    Fragility of the dissipationless state in clean two-dimensional superconductors (2019)
    Springer Nature
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    Publication Date: 2019
    Print ISSN: 1745-2473
    Electronic ISSN: 1745-2481
    Topics: Physics
    Published by Springer Nature
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  • 4
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    Nature of the quantum metal in a two-dimensional crystalline superconductor (2016)
    Springer Nature
    Details
    Publication Date: 2016-03-02
    Description: Nature Physics 12, 208 (2016). doi:10.1038/nphys3579 Authors: A. W. Tsen, B. Hunt, Y. D. Kim, Z. J. Yuan, S. Jia, R. J. Cava, J. Hone, P. Kim, C. R. Dean & A. N. Pasupathy Two-dimensional (2D) materials are not expected to be metals at low temperature owing to electron localization. Consistent with this, pioneering studies on thin films reported only superconducting and insulating ground states, with a direct transition between the two as a function of disorder or magnetic field. However, more recent works have revealed the presence of an intermediate quantum metallic state occupying a substantial region of the phase diagram, whose nature is intensely debated. Here, we observe such a state in the disorder-free limit of a crystalline 2D superconductor, produced by mechanical co-lamination of NbSe2 in an inert atmosphere. Under a small perpendicular magnetic field, we induce a transition from superconductor to the quantum metal. We find a unique power-law scaling with field in this phase, which is consistent with the Bose-metal model where metallic behaviour arises from strong phase fluctuations caused by the magnetic field.
    Print ISSN: 1745-2473
    Electronic ISSN: 1745-2481
    Topics: Physics
    Published by Springer Nature
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  • 5
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    Pairing states of composite fermions in double-layer graphene (2019)
    Springer Nature
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    Publication Date: 2019
    Print ISSN: 1745-2473
    Electronic ISSN: 1745-2481
    Topics: Physics
    Published by Springer Nature
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  • 6
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    One-dimensional electrical contact to a two-dimensional material (2013)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2013-11-02
    Description: Heterostructures based on layering of two-dimensional (2D) materials such as graphene and hexagonal boron nitride represent a new class of electronic devices. Realizing this potential, however, depends critically on the ability to make high-quality electrical contact. Here, we report a contact geometry in which we metalize only the 1D edge of a 2D graphene layer. In addition to outperforming conventional surface contacts, the edge-contact geometry allows a complete separation of the layer assembly and contact metallization processes. In graphene heterostructures, this enables high electronic performance, including low-temperature ballistic transport over distances longer than 15 micrometers, and room-temperature mobility comparable to the theoretical phonon-scattering limit. The edge-contact geometry provides new design possibilities for multilayered structures of complimentary 2D materials.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, L -- Meric, I -- Huang, P Y -- Gao, Q -- Gao, Y -- Tran, H -- Taniguchi, T -- Watanabe, K -- Campos, L M -- Muller, D A -- Guo, J -- Kim, P -- Hone, J -- Shepard, K L -- Dean, C R -- New York, N.Y. -- Science. 2013 Nov 1;342(6158):614-7. doi: 10.1126/science.1244358.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Electrical Engineering, Columbia University, New York, NY 10027, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24179223" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 7
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    Hofstadter's butterfly and the fractal quantum Hall effect in moire superlattices (2013)
    Nature Publishing Group (NPG)
    Details
    Publication Date: 2013-05-17
    Description: Electrons moving through a spatially periodic lattice potential develop a quantized energy spectrum consisting of discrete Bloch bands. In two dimensions, electrons moving through a magnetic field also develop a quantized energy spectrum, consisting of highly degenerate Landau energy levels. When subject to both a magnetic field and a periodic electrostatic potential, two-dimensional systems of electrons exhibit a self-similar recursive energy spectrum. Known as Hofstadter's butterfly, this complex spectrum results from an interplay between the characteristic lengths associated with the two quantizing fields, and is one of the first quantum fractals discovered in physics. In the decades since its prediction, experimental attempts to study this effect have been limited by difficulties in reconciling the two length scales. Typical atomic lattices (with periodicities of less than one nanometre) require unfeasibly large magnetic fields to reach the commensurability condition, and in artificially engineered structures (with periodicities greater than about 100 nanometres) the corresponding fields are too small to overcome disorder completely. Here we demonstrate that moire superlattices arising in bilayer graphene coupled to hexagonal boron nitride provide a periodic modulation with ideal length scales of the order of ten nanometres, enabling unprecedented experimental access to the fractal spectrum. We confirm that quantum Hall features associated with the fractal gaps are described by two integer topological quantum numbers, and report evidence of their recursive structure. Observation of a Hofstadter spectrum in bilayer graphene means that it is possible to investigate emergent behaviour within a fractal energy landscape in a system with tunable internal degrees of freedom.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dean, C R -- Wang, L -- Maher, P -- Forsythe, C -- Ghahari, F -- Gao, Y -- Katoch, J -- Ishigami, M -- Moon, P -- Koshino, M -- Taniguchi, T -- Watanabe, K -- Shepard, K L -- Hone, J -- Kim, P -- England -- Nature. 2013 May 30;497(7451):598-602. doi: 10.1038/nature12186. Epub 2013 May 15.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, The City College of New York, New York, New York 10031, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/23676673" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Published by Nature Publishing Group (NPG)
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  • 8
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    Bilayer graphene. Tunable fractional quantum Hall phases in bilayer graphene (2014)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2014-07-06
    Description: Symmetry-breaking in a quantum system often leads to complex emergent behavior. In bilayer graphene (BLG), an electric field applied perpendicular to the basal plane breaks the inversion symmetry of the lattice, opening a band gap at the charge neutrality point. In a quantizing magnetic field, electron interactions can cause spontaneous symmetry-breaking within the spin and valley degrees of freedom, resulting in quantum Hall effect (QHE) states with complex order. Here, we report fractional QHE states in BLG that show phase transitions that can be tuned by a transverse electric field. This result provides a model platform with which to study the role of symmetry-breaking in emergent states with topological order.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Maher, Patrick -- Wang, Lei -- Gao, Yuanda -- Forsythe, Carlos -- Taniguchi, Takashi -- Watanabe, Kenji -- Abanin, Dmitry -- Papic, Zlatko -- Cadden-Zimansky, Paul -- Hone, James -- Kim, Philip -- Dean, Cory R -- New York, N.Y. -- Science. 2014 Jul 4;345(6192):61-4. doi: 10.1126/science.1252875.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Columbia University, New York, NY 10027, USA. ; Department of Electrical Engineering, Columbia University, New York, NY 10027, USA. ; Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA. ; National Institute for Materials Science, 1-1 Namiki, Tsukuba, Japan. ; Perimeter Institute for Theoretical Physics, Waterloo, ON N2L 2Y5, Canada. Institute for Quantum Computing, Waterloo, ON N2L 3G1, Canada. ; Physics Program, Bard College, Annandale-on-Hudson, NY 12504, USA. ; Department of Physics, Columbia University, New York, NY 10027, USA. pk2015@columbia.edu cdean@ccny.cuny.edu. ; Department of Physics, The City College of New York, New York, NY 10031, USA. pk2015@columbia.edu cdean@ccny.cuny.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/24994646" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Evidence for a fractional fractal quantum Hall effect in graphene superlattices (2016)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2016-01-20
    Description: The Hofstadter energy spectrum provides a uniquely tunable system to study emergent topological order in the regime of strong interactions. Previous experiments, however, have been limited to low Bloch band fillings where only the Landau level index plays a role. We report measurements of high-mobility graphene superlattices where the complete unit cell of the Hofstadter spectrum is accessible. We observed coexistence of conventional fractional quantum Hall effect (QHE) states together with the integer QHE states associated with the fractal Hofstadter spectrum. At large magnetic field, we observed signatures of another series of states, which appeared at fractional Bloch filling index. These fractional Bloch band QHE states are not anticipated by existing theoretical pictures and point toward a distinct type of many-body state.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, Lei -- Gao, Yuanda -- Wen, Bo -- Han, Zheng -- Taniguchi, Takashi -- Watanabe, Kenji -- Koshino, Mikito -- Hone, James -- Dean, Cory R -- New York, N.Y. -- Science. 2015 Dec 4;350(6265):1231-4. doi: 10.1126/science.aad2102.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA. Kavli Institute at Cornell for Nanoscale Science, Ithaca, NY 14853, USA. ; Department of Mechanical Engineering, Columbia University, New York, NY 10027, USA. ; Department of Physics, Columbia University, New York, NY 10027, USA. ; National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan. ; Department of Physics, Tohoku University, Sendai 980-8578, Japan. ; Department of Physics, Columbia University, New York, NY 10027, USA. cdean@phys.columbia.edu.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/26785484" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 10
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    Electronic compressibility of layer-polarized bilayer graphene (2012)
    American Physical Society (APS)
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    Publication Date: 2012-06-28
    Description: Author(s): A. F. Young, C. R. Dean, I. Meric, S. Sorgenfrei, H. Ren, K. Watanabe, T. Taniguchi, J. Hone, K. L. Shepard, and P. Kim We report on a capacitance study of dual gated bilayer graphene. The measured capacitance allows us to probe the electronic compressibility as a function of carrier density, temperature, and applied perpendicular electrical displacement D ̅ . As a band gap is induced with increasing D ̅ ... [Phys. Rev. B 85, 235458] Published Wed Jun 27, 2012
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
    Published by American Physical Society (APS)
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