Pezzini S, Mišeikis V, Piccinini G, Forti S, Pace S, Engelke R, Rossella F, Watanabe K, Taniguchi T, Kim P, Coletti C. 30°-Twisted Bilayer Graphene Quasicrystals from Chemical Vapor Deposition [Internet]. Nano Letters 2020;20(5):3313–3319. Publisher's Version
Diamantini MC, Mironov AY, Postolova SM, Liu X, Hao Z, Silevitch DM, Kopelevich Y, Kim P, Trugenberger CA, Vinokur VM. Bosonic topological insulator intermediate state in the superconductor-insulator transition [Internet]. Physics Letters A 2020;384(23):126570. Publisher's Version
Sung J, Zhou Y, Scuri G, Zólyomi V, Andersen TI, Yoo H, Wild DS, Joe AY, Gelly RJ, Heo H, Magorrian SJ, Bérubé D, Valdivia AMM, Taniguchi T, Watanabe K, Lukin MD, Kim P, Fal'ko VI, Park H. Broken mirror symmetry in excitonic response of reconstructed domains in twisted MoSe2/MoSe2 bilayers [Internet]. Nature Nanotechnology 2020; Publisher's Version
Zhou Y, Scuri G, Sung J, Gelly RJ, Wild DS, De Greve K, Joe AY, Taniguchi T, Watanabe K, Kim P, Lukin MD, Park H. Controlling Excitons in an Atomically Thin Membrane with a Mirror [Internet]. Physical Review Letters 2020;124(2) Publisher's Version
Scuri G, Andersen TI, Zhou Y, Wild DS, Sung J, Gelly RJ, Bérubé D, Heo H, Shao L, Joe AY, Valdivia AMM, Taniguchi T, Watanabe K, Lončar M, Kim P, Lukin MD, Park H. Electrically Tunable Valley Dynamics in Twisted WSe2/WSe2 Bilayers [Internet]. Physical Review Letters 2020;124(21) Publisher's Version
Ku MJH, Zhou TX, Li Q, Shin YJ, Shi JK, Burch C, Anderson LE, Pierce AT, Xie Y, Hamo A, Vool U, Zhang H, Casola F, Taniguchi T, Watanabe K, Fogler MM, Kim P, Yacoby A, Walsworth RL. Imaging viscous flow of the Dirac fluid in graphene [Internet]. Nature 2020;583(7817):537–541. Publisher's Version
Sunku SS, McLeod AS, Stauber T, Yoo H, Halbertal D, Ni G, Sternbach A, Jiang B-Y, Taniguchi T, Watanabe K, Kim P, Fogler MM, Basov DN. Nano-photocurrent Mapping of Local Electronic Structure in Twisted Bilayer Graphene [Internet]. Nano Letters 2020;20(5):2958–2964. Publisher's Version
Kruchkov A, Patel AA, Kim P, Sachdev S. Thermoelectric power of Sachdev-Ye-Kitaev islands: Probing Bekenstein-Hawking entropy in quantum matter experiments [Internet]. Physical Review B 2020;101(20) Publisher's Version
Liu X, Hao Z, Khalaf E, Lee JY, Ronen Y, Yoo H, Najafabadi DH, Watanabe K, Taniguchi T, Vishwanath A, Kim P. Tunable spin-polarized correlated states in twisted double bilayer graphene [Internet]. Nature 2020;583(7815):221–225. Publisher's Version
Cevallos FA, Guo S, Heo H, Scuri G, Zhou Y, Sung J, Taniguchi T, Watanabe K, Kim P, Park H, Cava RJ. Liquid Salt Transport Growth of Single Crystals of the Layered Dichalcogenides MoS2 and WS2 [Internet]. Crystal Growth & Design 2019;19(10):5762-5767. Publisher's Version
Andersen TI, Dwyer BL, Sanchez-Yamagishi JD, Rodriguez-Nieva JF, Agarwal K, Watanabe K, Taniguchi T, Demler EA, Kim P, Park H, Lukin MD. Electron-phonon instability in graphene revealed by global and local noise probes [Internet]. Science 2019;364(6436):154–157. Publisher's VersionAbstract
Studying the electronic properties of graphene under extreme nonequilibrium conditions has provided a productive testbed to probe and monitor exotic transport phenomena. Andersen et al. report measurements of electron transport in ultraclean graphene devices where the electron drift velocity is extremely high. They found that direct current at high drift velocities generates a large increase in the noise at gigahertz frequencies and that the noise grows exponentially in the direction of the current. The authors attribute the emission mechanism to amplification of acoustic phonons through the Cerenkov effect.Science, this issue p. 154Understanding and controlling nonequilibrium electronic phenomena is an outstanding challenge in science and engineering. By electrically driving ultraclean graphene devices out of equilibrium, we observe an instability that is manifested as substantially enhanced current fluctuations and suppressed conductivity at microwave frequencies. Spatial mapping of the nonequilibrium current fluctuations using nanoscale magnetic field sensors reveals that the fluctuations grow exponentially along the direction of carrier flow. Our observations, including the dependence on density and temperature, are consistently explained by the emergence of an electron-phonon Cerenkov instability at supersonic drift velocities. These results offer the opportunity for tunable terahertz generation and active phononic devices based on two-dimensional materials.
Yoo H, Engelke R, Carr S, Fang S, Zhang K, Cazeaux P, Sung SH, Hovden R, Tsen AW, Taniguchi T, Watanabe K, Yi G-C, Kim M, Luskin M, Tadmor EB, Kaxiras E, Kim P. Atomic and electronic reconstruction at the van der Waals interface in twisted bilayer graphene [Internet]. Nature Materials 2019;18(5):448–453. Publisher's Version
Jauregui LA, Joe AY, Pistunova K, Wild DS, High AA, Zhou Y, Scuri G, De Greve K, Sushko A, Yu C-H, Taniguchi T, Watanabe K, Needleman DJ, Lukin MD, Park H, Kim P. Electrical control of interlayer exciton dynamics in atomically thin heterostructures [Internet]. Science 2019;366(6467):870–875. Publisher's Version
Dibos AM, Zhou Y, Jauregui LA, Scuri G, Wild DS, High AA, Taniguchi T, Watanabe K, Lukin MD, Kim P, Park H. Electrically Tunable Exciton–Plasmon Coupling in a WSe2 Monolayer Embedded in a Plasmonic Crystal Cavity [Internet]. Nano Letters 2019;19(6):3543–3547. Publisher's Version
Chaudhary K, Tamagnone M, Rezaee M, Bediako DK, Ambrosio A, Kim P, Capasso F. Engineering phonon polaritons in van der Waals heterostructures to enhance in-plane optical anisotropy [Internet]. Science Advances 2019;5(4):eaau7171. Publisher's Version
Wang K, Elahi MM, Wang L, Habib KMM, Taniguchi T, Watanabe K, Hone J, Ghosh AW, Lee G-H, Kim P. Graphene transistor based on tunable Dirac fermion optics [Internet]. Proceedings of the National Academy of Sciences 2019;116(14):6575–6579. Publisher's Version
Cheng A, Taniguchi T, Watanabe K, Kim P, Pillet J-D. Guiding Dirac Fermions in Graphene with a Carbon Nanotube [Internet]. Physical Review Letters 2019;123(21) Publisher's Version
Elahi MM, Habib KMM, Wang K, Lee G-H, Kim P, Ghosh AW. Impact of geometry and non-idealities on electron “optics” based graphene p-n junction devices [Internet]. Applied Physics Letters 2019;114(1):013507. Publisher's Version
Liu X, Hao Z, Watanabe K, Taniguchi T, Halperin BI, Kim P. Interlayer fractional quantum Hall effect in a coupled graphene double layer [Internet]. Nature Physics 2019;15(9):893–897. Publisher's Version
Tamagnone M, Chaudhary K, Yin X, Spagele C, Li J, Oscurato S, Rubin NA, Jauregui L, Kim P, Edgar JH, Ambrosio A, Capasso F. Polariton Meta-Optics with Phase-Change Materials [Internet]. In: Conference on Lasers and Electro-Optics. OSA; 2019 Publisher's Version