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10 papers
Organometallic Hexahapto Functionalization of Single Layer Graphene as a Route to High Mobility Graphene Devices
Santanu Sarkar, Hang Zhang, Jhao-Wun Huang +4
Organometallic hexahapto chromium metal complexation of single layer graphene, which involves constructive rehybridization of the graphene pi-system with the vacant chromium d orbi…
Transport in Suspended Monolayer and Bilayer Graphene Under Strain: A New Platform for Material Studies
Hang Zhang, Jhao-Wun Huang, Jairo Velasco +9
We develop two types of graphene devices based on nanoelectromechanical systems (NEMS), that allows transport measurement in the presence of in situ strain modulation. Different mo…
Visualizing Electrical Breakdown and ON/OFF States in Electrically Switchable Suspended Graphene Break Junctions
Hang Zhang, Wenzhong Bao, Zeng Zhao +8
Narrow gaps are formed in suspended single to few layer graphene devices using a pulsed electrical breakdown technique. The conductance of the resulting devices can be programmed b…
Aryl Functionalization as a Route to Band Gap Engineering in Single Layer Graphene Devices
Hang Zhang, Elena Bekyarova, Jhao-Wun Huang +5
Chemical functionalization is a promising route to band gap engineering of graphene. We chemically grafted nitrophenyl groups onto exfoliated single-layer graphene sheets in the fo…
Suspension and Measurement of Graphene and Bi2Se3 Atomic Membranes
Jairo Velasco, Zeng Zhao, Hang Zhang +7
Coupling high quality, suspended atomic membranes to specialized electrodes enables investigation of many novel phenomena, such as spin or Cooper pair transport in these two dimens…
Magnetoconductance Oscillations in High-Mobility Suspended Bilayer and Trilayer Graphene
Wenzhong Bao, Zeng Zhao, Hang Zhang +6
We report pronounced magnetoconductance oscillations observed on suspended bilayer and trilayer graphene devices with mobilities up to 270,000 cm2/Vs. For bilayer devices, we obser…
Lithography-free Fabrication of High Quality Substrate-supported and Freestanding Graphene devices
W. Bao, G. Liu, Z. Zhao +5
We present a lithography-free technique for fabrication of clean, high quality graphene devices. This technique is based on evaporation through hard Si shadow masks, and eliminates…
Probing Charging and Localization in the Quantum Hall Regime by Graphene pnp Junctions
Jairo Velasco, Gang Liu, Lei Jing +4
Using high quality graphene pnp junctions, we observe prominent conductance fluctuations on transitions between quantum Hall (QH) plateaus as the top gate voltage Vtg is varied. In…
Premature Switching in Graphene Josephson Transistors
Feng Miao, Wenzhong Bao, Hang Zhang +1
We investigate electronic transport in single layer graphene coupled to superconducting electrodes. In these Josephson transistors, we observe significant suppression in the critic…
Ripple Texturing of Suspended Graphene Atomic Membranes
Wenzhong Bao, Feng Miao, Zhen Chen +4
Graphene is the nature's thinnest elastic membrane, with exceptional mechanical and electrical properties. We report the direct observation and creation of one-dimensional (1D) and…