776 citations · 1.8k across the 28 of their papers we have counts for
28 papers
Plasmonic nanocavity-enabled universal detection of layer-breathing vibrations in two-dimensional materials
Wu Heng, Lin Miao-Ling, Yan Sen +12
Conventional Raman spectroscopy faces inherent limitations in detecting interlayer layer breathing (LB) vibrations with inherently weak electron-phonon coupling or Raman inactivity…
Roadmap: 2D Materials for Quantum Technologies
Qimin Yan, Tongcang Li, Xingyu Gao +29
Two-dimensional (2D) materials have emerged as a versatile and powerful platform for quantum technologies, offering atomic-scale control, strong quantum confinement, and seamless i…
Variational Scarring in Graphene Quantum Dots
J. Keski-Rahkonen, C. Zou, A. M. Graf +4
A quantum eigenstate of a classically chaotic system is referred as scarred by an unstable periodic orbit if its probability density is concentrated in the vicinity of that orbit.…
Visualizing and manipulating chiral interface states in a moiré quantum anomalous Hall insulator
Canxun Zhang, Tiancong Zhu, Salman Kahn +7
Moiré systems made from stacked two-dimensional materials host novel correlated and topological states that can be electrically controlled via applied gate voltages. We have used t…
A novel superstructure in epitaxially grown 1T-TaTe
Jinwoong Hwang, Yeongrok Jin, Canxun Zhang +13
The spontaneous formation of electronic orders is a crucial element for understanding complex quantum states and engineering heterostructures in two-dimensional materials. We repor…
Local spectroscopy of a gate-switchable moiré quantum anomalous Hall insulator
Canxun Zhang, Tiancong Zhu, Tomohiro Soejima +7
In recent years, correlated insulating states, unconventional superconductivity, and topologically non-trivial phases have all been observed in several moiré heterostructures. Howe…
Large-gap insulating dimer ground state in monolayer IrTe2
Jinwoong Hwang, Kyoo Kim, Canxun Zhang +11
Monolayers of two-dimensional van der Waals materials exhibit novel electronic phases distinct from their bulk due to the symmetry breaking and reduced screening in the absence of…
Evidence for a spinon Kondo effect in cobalt atoms on single-layer 1T-TaSe
Yi Chen, Wen-Yu He, Wei Ruan +13
Quantum spin liquids (QSLs) are highly entangled, disordered magnetic states that arise in frustrated Mott insulators and host exotic fractional excitations such as spinons and cha…
Imaging gate-tunable Tomonaga-Luttinger liquids in 1H-MoSe mirror twin boundaries
Tiancong Zhu, Wei Ruan, Yan-Qi Wang +15
One-dimensional electron systems (1DESs) exhibit properties that are fundamentally different from higher-dimensional systems. For example, electron-electron interactions in 1DESs h…
Atomic scale visualization of topological spin textures in the chiral magnet MnGe
Jacob Repicky, Po-Kuan Wu, Tao Liu +8
Spin polarized scanning tunneling microscopy is used to directly image topological magnetic textures in thin films of MnGe, and to correlate the magnetism with structure probed at…
Visualizing delocalized correlated electronic states in twisted double bilayer graphene
Canxun Zhang, Tiancong Zhu, Salman Kahn +12
The discovery of interaction-driven insulating and superconducting phases in moiré van der Waals heterostructures has sparked considerable interest in understanding the novel corre…
Chemical Migration and Dipole Formation at van der Waals Interfaces between Magnetic Transition Metal Chalcogenides and Topological Insulators
Brenton A. Noesges, Tiancong Zhu, Jacob J. Repicky +5
Metal and magnetic overlayers alter the surface of the topological insulator (TI) bismuth selenide (BiSe) through proximity effects but also by changing the composition and…
Coherent Growth and Characterization of van der Waals 1T-VSe Layers on GaAs(111)B Using Molecular Beam Epitaxy
Tiancong Zhu, Dante J. O'Hara, Brenton A. Noesges +7
We report epitaxial growth of vanadium diselenide (VSe) thin films in the octahedrally-coordinated (1T) structure on GaAs(111)B substrates by molecular beam epitaxy. Film thick…
Magnetic Properties and Electronic Structure of Magnetic Topological Insulator MnBiSe
Tiancong Zhu, Alexander J. Bishop, Tong Zhou +12
The intrinsic magnetic topological insulators MnBiX (X = Se, Te) are promising candidates in realizing various novel topological states related to symmetry breaking by magn…
Transport Spectroscopy of Sublattice-Resolved Resonant Scattering in Hydrogen-Doped Bilayer Graphene
Jyoti Katoch, Tiancong Zhu, Denis Kochan +3
We report the experimental observation of sublattice-resolved resonant scattering in bilayer graphene by performing simultaneous cryogenic atomic hydrogen doping and electron trans…
Importance of Paramagnetic Background Subtraction for Determining the Magnetic Moment in Epitaxially Grown Monolayer and Few-Layer van der Waals Magnets
Dante J. O'Hara, Tiancong Zhu, Roland K. Kawakami
Due to the atomically thin nature of monolayer and few-layer van der Waals magnets, the undesired background signal from the substrate can have significant contribution when charac…
Surface Structures of Epitaxial B20 FeGe(-1-1-1) Thin Films via Scanning Tunneling Microscopy
J. P. Corbett, T. Zhu, A. S. Ahmed +5
We grew 20-100 nm thick films of B20 FeGe by molecular beam epitaxy and investigated the surface structures via scanning tunneling microscopy. We observed the atomic resolution of…
Probing Tunneling Spin Injection into Graphene via Bias Dependence
Tiancong Zhu, Simranjeet Singh, Jyoti Katoch +4
The bias dependence of spin injection in graphene lateral spin valves is systematically studied to determine the factors affecting the tunneling spin injection efficiency. Three ty…
Strong and Tunable Spin Lifetime Anisotropy in Dual-Gated Bilayer Graphene
Jinsong Xu, Tiancong Zhu, Yunqiu Kelly Luo +2
We report the discovery of a strong and tunable spin lifetime anisotropy with excellent spin lifetimes up to 7.8 ns in dual-gated bilayer graphene. Remarkably, this realizes the ma…
Topological Dirac Semimetal Na3Bi Films in the Ultrathin Limit via Alternating Layer Molecular Beam Epitaxy
Igor V. Pinchuk, Thaddeus J. Asel, Andrew Franson +6
Ultrathin films of Na3Bi on insulating substrates are desired for opening a bulk band gap and generating the quantum spin Hall effect from a topological Dirac semimetal, though con…
Room Temperature Intrinsic Ferromagnetism in Epitaxial Manganese Selenide Films in the Monolayer Limit
Dante J. O'Hara, Tiancong Zhu, Amanda H. Trout +9
Monolayer van der Waals (vdW) magnets provide an exciting opportunity for exploring two-dimensional (2D) magnetism for scientific and technological advances, but the intrinsic ferr…
Spin inversion in graphene spin valves by gate-tunable magnetic proximity effect at one-dimensional contacts
Jinsong Xu, Simranjeet Singh, Jyoti Katoch +4
Graphene has remarkable opportunities for spintronics due to its high mobility and long spin diffusion length, especially when encapsulated in hexagonal boron nitride (h-BN). Here,…
Modeling the Oblique Spin Precession in Lateral Spin Valves for Accurate Determination of Spin Lifetime Anisotropy: Effect of Finite Contact Resistance and Channel Length
Tiancong Zhu, Roland K Kawakami
The spin lifetime anisotropy is an important quantity for investigating the spin relaxation mechanisms in graphene and in heterostructures of two-dimensional materials. We generali…
Opto-Valleytronic Spin Injection in Monolayer MoS2/Few-Layer Graphene Hybrid Spin Valves
Yunqiu, Luo, Jinsong Xu +6
Two dimensional (2D) materials provide a unique platform for spintronics and valleytronics due to the ability to combine vastly different functionalities into one vertically-stacke…