*denotes equal contribution

2024

Z. Ge, A. M. Graf, J. Keski-Rahkonen, S. Slizovskiy, P. Polizogopoulos, T. Taniguchi, K. Watanabe, R. Van Haren, D. Lederman, V. I. Fal’ko, E. J. Heller, J. Velasco Jr., “Direct Visualization of Relativistic Quantum Scars in Graphene Quantum Dots”, In Press at Nature (2024), related preprint arXiv:2409.10675

2023

2022

F. Joucken, J. L. Davenport, Z. Ge, E. A. Quezada-Lopez, T. Taniguchi, K. Watanabe, J. Velasco Jr., J. Lagoute, and R. A. Kaindl, “Denoising Scanning Tunneling Microscopy Images with Machine Learning”, Phys. Rev. Materials (2022), DOI:10.1103/PhysRevMaterials.6.123802

Y. Lee, S. Che, J. Velasco Jr., X. Gao, Y. Shi, D. Tran, J. Baima, F. Mauri, M. Calandra, M. Bockrath, C. N. Lau, “Gate-Tunable Magnetism and Gian Magnetoresistance in Suspended Rhombohedral-Stacked Few-Layer Graphene”, Nano Letters (2022), DOI:10.1021/acs.nanolett.2c.00466

J. Balgley, J. Butler, S. Biswas, Z. Ge, S. Lagasse, T. Taniguchi, K. Watanabe, M. Cothrine, D.G. Mandrus, J.Velasco Jr., R. Valenti, and E.A. Henriksen, “Ultrasharp Lateral p-n Junctions in Modulation-Doped Graphene”, Nano Letters (2022), DOI:10.1021/acs.nanolett.2c.00785

2021

V. Kaladzhyan,  F. Joucken, Z. Ge, E.A. Quezada-Lopez, T. Taniguchi, K. Watanabe, J. Velasco Jr., and C. Bena, “Quasiparticle interference patterns in Bilayer graphene with trigonal warping”, Physical Review B (2021), DOI:10.1103/PhysRevB.104.235425

V. Kaladzhyan, S. Pinon, F. Joucken, Z. Ge, E.A. Quezada-Lopez, T. Taniguchi, K. Watanabe, J. Velasco Jr., and C. Bena, “Surface States and quasiparticle interference in Bernal and rhombohedral graphite with and without trigonal warping”, Physical Review B (2021), DOI: 10.1103/PhysRevB.104.155418

Z. Ge*, D. Wong*, J. Lee, F. Joucken, E.A. Quezada-Lopez, S. Kahn, H.Z. Tsai, T. Taniguchi, K. Watanabe, F. Wang, A. Zettl, M.F. Crommie, and J. Velasco Jr., “Imaging Quantum Interference in Stadium-Shaped Monolayer and Bilayer Graphene Quantum Dots”, Nano Letters (2021), DOI:10.1021/acs.nanolett.1c02271

Z. Ge*, S. Slizovskiy*, F. Joucken, E.A. Quezada-Lopez, T. Taniguchi, K. Watanabe, V. Fal’ko, and J. Velasco Jr., “Control of Giant Topological Magnetic Moment and Valley Splitting in Trilayer Graphene”,Physical Review Letters (2021), DOI: 10.1103/PhysRevLett.127.136402

F. Joucken, C. Bena, Z. Ge, E.A. Quezada-Lopez, F. Ducastelle, T. Taniguchi, K. Watanabe, J. Velasco Jr., “Sublattice dependence and gate-tunability of midgap and resonant states induced by native dopants in Bernal-stacked bilayer graphene”, Physical Review Letters (2021), DOI: 10.1103/PhysRevLett.127.106401

F. Joucken, C. Bena, Z. Ge, E.A. Quezada-Lopez, S. Pinon, V. Kaladzhyan, T. Taniguchi, K. Watanabe, Aires Ferreira, J. Velasco Jr., “Direct Visualization of Native Defects in Graphite and Their Effect on the Electronic Properties of Bernal Stacked Bilayer Graphene”, Nano Letters (2021), DOI: 10.1021/acs.nanolett.1c01442

2020

Z. Ge*, F. Joucken*, E.A. Quezada-Lopez*, D. R. da Costa, J. Davenport, B. Giraldo, T. Taniguchi, K. Watanabe, N. P. Kobayashi, T. Low, J. Velasco Jr., “Visualization and Manipulation of Bilayer Graphene Quantum Dots with Broken Rotational Symmetry and Nontrivial Topology”, Nano Letters (2020), DOI: 10.1021/acs.nanolett.0c03453

E.A. Quezada-Lopez*, Z. Ge*, T. Taniguchi, K. Watanabe, F. Joucken, and J. Velasco Jr., “Comprehensive Electrostatic Modeling of Exposed Quantum Dots in Graphene/Hexagonal Boron Nitride Heterostructures”, Nanomaterials 10, 1154 (2020)

F. Joucken*, Z. Ge*, E.A. Quezada-López, J.L. Davenport, K. Watanabe, T. Taniguchi, and J. Velasco Jr., “Determination of the trigonal warping orientation in Bernal-stacked bilayer graphene via scanning tunneling microscopy,” Physical Review B 10, 161103(R) (2020); DOI:doi.org/10.1103/PhysRevB.101.161103

E.A. Quezada-Lopez, F. Joucken, H. Chen, A. Lara, J.L. Davenport, K. Helier, T. Taniguchi, K. Watanabe, S. Carter, A.P. Ramirez, J. Velasco Jr., “Persistent and reversible electrostatic control of doping in graphene/hexagonal boron nitride heterostructures”, J. Appl.Phys. 127, 044303 (2020);DOI:10.1063/1.5127770

2019

T. He, B. Lu, Y. Chen, Y. Wang, Y. Zhang, J. L. Davenport, A.P. Chen, C.W. Pao, M. Liu, Z. Sun, A. Stram, A. Mordaunt, J. Velasco Jr., Y. Ping, Y. Zhang, S.Chen, “Nanowrinkled Carbon Aerogels Embedded with FeN_x Sites as Effective Oxygen Electrodes for Rechargeable Zinc-Air Battery”, Research 2019, 6813585 (2019); DOI:10.34133

J. L. Davenport, Z. Ge, J. Liu, C. Nuñez-Lobato, S. Moon, Z. Lu, E. A. Quezada-Lopez, K. Hellier, P. G. LaBarre, T. Taniguchi, K. Watanabe, S. Carter, A. P. Ramirez, D. Smirnov, and J. Velasco Jr., “Probing the electronic structure of graphene near and far from the Fermi level via planar tunneling spectroscopy”, Applied Physics Letters 115, 163504 (2019); DOI: 10.1063/1.5118422

F. Joucken, E. Quezada-López, J. Avila, C. Chen, J. L Davenport, H. Chen, K. Watanabe, T. Taniguchi, M. Carmen Asensio, J. Velasco Jr., “Nanospot angle-resolved photoemission study of Bernal-stacked bilayer graphene on hexagonal boron nitride: Band structure and local variation of lattice alignment”, Physical Review B 99, 161406(R) (2019) DOI: doi.org/10.1103/PhysRevB.99.161406

F. Joucken*, J. Avila*, Z. Ge, E. Quezada-Lopez, H. Yi, R. Le Goff, E. Baudin, J. L. Davenport, K. Watanabe, T. Taniguchi, M. Carmen Asensio, and J. Velasco Jr., “Visualizing the Effect of an Electrostatic Gate with Angle-Resolved Photoemission Spectroscopy”, Nano Letters (2019) DOI:10.1021/acs.nanolett.9b00649

2018

J. Velasco Jr.*, J. Lee*, D. Wong*, S. Kahn, H.Z. Tsai, J. Costello, T. Umeda, T. Taniguchi, K. Watanabe, A. Zettl, F. Wang, and M. F. Crommie, “Visualization and Control of Single-Electron Charging in Bilayer Graphene Quantum Dots”, Nano Letters (2018) DOI: https://doi.org/10.1021/acs.nanolett.8b01972

2016

J. Lee*, D. Wong*, J. Velasco Jr. ^†, J. F Rodriguez-Nieva, S. Kahn, H.Z. Tsai, T. Taniguchi, K. Watanabe, A. Zettl, F. Wang, L. Levitov, M. F. Crommie^†, “Imaging Electrostatically Confined Dirac Fermions in Graphene Quantum Dots”, Nature Physics, (2016), DOI: http://dx.doi.org/10.1038/nphys3805

Publications prior to start of research program at UCSC:

2015

D. Wong*, J. Velasco Jr.*, L. Ju*, J. Lee, S. Kahn, H.Z. Tsai, C. Germany, T. Taniguchi, K. Watanabe, A. Zettl, F. Wang, M. F. Crommie, “Characterization and manipulation of individual defects in insulating hexagonal boron nitride using scanning tunneling microscopy”, Nature Nanotechnology (2015)

2014

Y. Lee, D. Tran, K. Myhro, J. Velasco Jr., N. Gillgren, C. N. Lau, Y. Barlas, J.M. Poumirol, D. Smirnov, F. Guinea, “Competition between spontaneous symmetry breaking and single-particle gaps in trilayer graphene” Nature Communications 5, Article number: 5656 (2014)

J. Velasco Jr.*, Y. Lee*, F. Zhang*, K. Myhro, D. Tran, M. Deo, D. Smirnov, A. H. MacDonald, C. N. Lau, “Competing Ordered Filling Factor Two States in Bilayer Graphene”, Nature Communications 5, Article number :4550 (2014)

L. Ju*, J. Velasco Jr.*, E. Huang, S. Kahn, C. Nosiglia, Hsin-Zon Tsai, W. Yang, T. Taniguchi, K. Watanabe, Y. Zhang, G. Zhang, M. Crommie, A. Zettl, F. Wang, “Photo-induced Doping in Graphene/Boron Nitride Heterostructures” Nature Nanotechnology 9, 348–352 (2014)

Highlighted by ScienceDaily

J. Velasco Jr., Y. Lee, Z. Zhao, L. Jing, P. Kratz, M. Bockrath, C. N. Lau, “Transport Measurement of Landau Level Gaps in Bilayer Graphene with Layer Polarization”, Nano Letters Vol. 14, 1324 (2014)

H. Zhang*, J.W. Huang*, J. Velasco Jr., K. Myhro, M. Maldonado, D. Tran, Z. Zhao, F. Wang, Y. Lee, G. Liu, W. Bao, C. N. Lau, “Transport in Suspended Monolayer and Bilayer Graphene Under Strain: A New Platform for Material Studies”, Carbon Volume 69, 336–341 (2014)

2013

Y. Lee, J. Velasco Jr., D. Tran, F. Zhang, W. Bao, L. Jing, K. Myhro, D. Smirnov, C.N. Lau, “Broken Symmetry Quantum Hall States in Dual Gated ABA Trilayer Graphene”, Nano Letters Vol. 4, 1627 (2013)

2012

C.N. Lau, W. Bao, J. Velasco Jr., “Properties of Suspended Graphene Membranes” Materials Today 15, 238-245 (2012)

J. Velasco Jr., Y. Lee, L. Jing, G. Liu, W. Bao, and C. N. Lau, “Quantum Transport in Double-gated Graphene Devices”, Solid State Communications 152, 1301 (2012)

W.Bao*, J. Velasco Jr. *, F. Zhang*, L. Jing, B. Standley, D. Smirnov, M. Bockrath, A. MacDonald, C.N. Lau, “Evidence for a Spontaneous Gapped State in Ultra-Clean Bilayer Graphene” Proceedings of the National Academy of Sciences 109, 10802 (2012)

J. Velasco Jr., L. Jing, W. Bao, Y. Lee, P. Kratz, V. Aji, M. Bockrath, C.N. Lau, C. Varma, R. Stillwell, D. Smirnov, F. Zhang, J. Jung, A.H. MacDonald, “Transport Spectroscopy of Symmetry-Broken Insulating States in Bilayer Graphene”, Nature Nanotechnology 7, 156–160 (2012)
Highlighted by International Journal Club for Condensed Matter Physics
Highlighted by American Chemical Society

2011

W. Bao, L. Jing, J. Velasco Jr., Y. Lee, D. Tran, B. Standley, M. Aykol, S. B. Cronin, D. Smirnov, M. Koshino, E. McCann, M. Bockrath, C. N. Lau. “Stacking-dependent band gap and transport in trilayer graphene” Nature Physics 7, 948–952 (2011)

J. Velasco Jr., Z. Zhao, H. Zhang, F. Wang, Z. Wang, P. Kratz, L. Jing, W. Bao, J. Shi and C. N. Lau, “Suspension and Measurement of Graphene and Bi₂Se₃ Thin Crystals” Nanotechnology 22, 285305 (2011)- Selected for cover

2010

L. Jing,* J. Velasco Jr.,* P. Kratz, G. Liu, W. Bao, M. Bockrath, and C. N. Lau, “Quantum Transport and Field-Induced Insulating States in Bilayer Graphene pnp Junctions” Nano Letters Vol.10, 4000 (2010)

J. Velasco Jr., G. Liu, L. Jing, P. Kratz, H. Zhang, W.Z. Bao, M. Bockrath, C.N. Lau, “Probing charging and localization in the quantum Hall regime by graphene pnp junctions”, Phys. Rev. B(R) 81, 121407 (2010) – Selected for Rapid Communications and Editor’s choice

2009

J. Velasco Jr. and G. Liu, W. Bao and C. N. Lau, “Electrical Transport in High Quality Graphene pnp Junctions” New J. Phys. 11, 095008 (2009)

G. Liu, J. Velasco Jr., W. Bao and C. N. Lau, “Fabrication of Graphene pnp Junctions with Contactless Top Gates” Appl. Phys. Lett., 92, 203103 (2008)

PATENTS:

“Suspended Structures”, Chun Ning Lau, Gang Liu, Jairo Velasco Jr., patent#7948042

“Local Doping of Two-Dimensional Materials”, Dillon Wong, Jairo Velasco Jr., Long Ju, Salman Kahn, Juwon Lee, Chad E. Germany, Alexander K. Zettl, Feng Wang, Michael F. Crommie, patent# 20160064249