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14 papers
On the Electron Pairing Mechanism of Copper-Oxide High Temperature Superconductivity
S. M. O'Mahony, Wangping Ren, Weijiong Chen +6
The elementary CuO2 plane sustaining cuprate high-temperature superconductivity occurs typically at the base of a periodic array of edge-sharing CuO5 pyramids. Virtual transitions…
Atomic-scale Visualization of Electronic Fluid Flow
Xiaolong Liu, Yi Xue Chong, Rahul Sharma +1
The most essential characteristic of any fluid is the velocity field v(r) and this is particularly true for macroscopic quantum fluids. Although rapid advances have occurred in qua…
Nanoscale probing of image-potential states and electron transfer doping in borophene polymorphs
Xiaolong Liu, Luqing Wang, Boris I. Yakobson +1
Using field-emission resonance spectroscopy with an ultrahigh vacuum scanning tunneling microscope, we reveal Stark-shifted image-potential states of the v_1/6 and v_1/5 borophene…
Severe Dirac Mass Gap Suppression in Sb_2Te_3-based Quantum Anomalous Hall Materials
Yi Xue Chong, Xiaolong Liu, Rahul Sharma +5
Quantum anomalous Hall (QAH) effect appears in ferromagnetic topological insulators (FMTI) when a Dirac mass gap opens in the spectrum of the topological surface states (SS). Unacc…
Discovery of a Cooper-Pair Density Wave State in a Transition-Metal Dichalcogenide
Xiaolong Liu, Yi Xue Chong, Rahul Sharma +1
Pair density wave (PDW) states are defined by a spatially modulating superconductive order-parameter. To search for such states in transition metal dichalcogenides (TMD) we use hig…
Coefficient of performance at maximum cooling power of a simplified quantum dot refrigerator model with resistance
Xiaolong Liu, Xiaoguang Luo, Chengyun Hong +4
A simplified analytical model of single-level quantum dot (QD) refrigerator was studied without considering the electron spin and Coulomb interaction. Based on the ballistic transp…
Stable Aqueous Dispersions of Optically and Electronically Active Phosphorene
Joohoon Kang, Spencer A. Wells, Joshua D. Wood +7
Understanding and exploiting the remarkable optical and electronic properties of phosphorene require mass production methods that avoid chemical degradation. While solution-based s…
Point Defects and Grain Boundaries in Rotationally Commensurate MoS2 on Epitaxial Graphene
Xiaolong Liu, Itamar Balla, Hadallia Bergeron +1
With reduced degrees of freedom, structural defects are expected to play a greater role in two-dimensional materials in comparison to their bulk counterparts. In particular, mechan…
Rotationally Commensurate Growth of MoS2 on Epitaxial Graphene
Xiaolong Liu, Itamar Balla, Hadallia Bergeron +3
Atomically thin MoS2/graphene heterostructures are promising candidates for nanoelectronic and optoelectronic technologies. Among different graphene substrates, epitaxial graphene…
Planar carbon nanotube-graphene hybrid films for high-performance broadband photodetectors
Yuanda Liu, Fengqiu Wang, Xiaomu Wang +8
Graphene has emerged as a promising material for photonic applications fuelled by its superior electronic and optical properties. However, the photoresponsivity is limited by the l…
Solvent Exfoliation of Electronic-Grade, Two-Dimensional Black Phosphorus
Joohoon Kang, Joshua D. Wood, Spencer A. Wells +4
Solution dispersions of two-dimensional (2D) black phosphorus (BP), often referred to as phosphorene, are achieved by solvent exfoliation. These pristine, electronic-grade BP dispe…
In Situ Thermal Decomposition of Exfoliated Two-Dimensional Black Phosphorus
Xiaolong Liu, Joshua D. Wood, Kan-Sheng Chen +2
With a semiconducting band gap and high charge carrier mobility, two-dimensional (2D) black phosphorus (BP), often referred to as phosphorene, holds significant promise for next ge…
Effective Passivation of Exfoliated Black Phosphorus Transistors against Ambient Degradation
Joshua D. Wood, Spencer A. Wells, Deep Jariwala +7
Unencapsulated, exfoliated black phosphorus (BP) flakes are found to chemically degrade upon exposure to ambient conditions. Atomic force microscopy, electrostatic force microscopy…
A Geometric Action for the Courant Bracket
Xiaolong Liu, Leopoldo A. Pando Zayas, V. G. J. Rodgers +1
An important operation in generalized complex geometry is the Courant bracket which extends the Lie bracket that acts only on vectors to a pair given by a vector and a p-form. We e…