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Ionic liquid gating induced self-intercalation of transition metal chalcogenides
Fei Wang, Yang Zhang, Zhijie Wang +6
Ionic liquids provide versatile pathways for controlling the structures and properties of quantum materials. Previous studies have reported electrostatic gating of nanometre-thick…
Angle-resolved photoemission spectroscopy
Hongyun Zhang, Tommaso Pincelli, Chris Jozwiak +4
For solid-state materials, the electronic structure, E(k), is critical in determining a crystal's physical properties. By experimentally detecting the electronic structure, the fun…
Ultrafast photothermoelectric effect in Dirac semimetallic Cd3As2 revealed by terahertz emission
Wei Lu, Zipu Fan, Yunkun Yang +11
The thermoelectric effects of topological semimetals have attracted tremendous research interest because many topological semimetals are excellent thermoelectric materials and ther…
Light-Tunable Surface State and Hybridization Gap in Magnetic Topological Insulator MnBiTe
Haoyuan Zhong, Changhua Bao, Huan Wang +6
MnBiTe is an intrinsic ferromagnetic (FM) topological insulator with different complex surface terminations. Resolving the electronic structures of different termination…
Seeded growth of high-quality transition metal dichalcogenide single crystals via chemical vapor transport
Hao Li, Junku Liu, Nan Guo +5
Transition metal dichalcogenides (TMDs) are van der Waals layered materials with sizable and tunable bandgaps, offering promising platforms for two-dimensional electronics and opto…
Enhancement of superconductivity in organic-inorganic hybrid topological materials
Haoxiong Zhang, Awabaikeli Rousuli, Shengchun Shen +10
Inducing or enhancing superconductivity in topological materials is an important route toward topological superconductivity. Reducing the thickness of transition metal dichalcogeni…
Electronic structure of molecular beam epitaxy grown 1T-MoTe film and strain effect
Xue Zhou, Zeyu Jiang, Kenan Zhang +5
Atomically thin transition metal dichalcogenide films with distorted trigonal (1T) phase have been predicted to be candidates for realizing quantum spin Hall effect. Growt…
Interlayer quantum transport in Dirac semimetal BaGa
Sheng Xu, Changhua Bao, Yi-Yan Wang +8
Quantum limit is quite easy to achieve once the band crossing exists exactly at the Fermi level () in topological semimetals. In multilayered Dirac fermion system, the density…
Crossover from 2D metal to 3D Dirac semimetal in metallic PtTe2 films with local Rashba effect
Ke Deng, Mingzhe Yan, Chu-Ping Yu +10
PtTe2 and PtSe2 with trigonal structure have attracted extensive research interests since the discovery of type-II Dirac fermions in the bulk crystals. The evolution of the electro…
Evidence of charge density wave with anisotropic gap in monolayer VTe film
Yuan Wang, Junhai Ren, Jiaheng Li +5
We report experimental evidence of charge density wave (CDW) transition in monolayer 1T-VTe film. 44 reconstruction peaks are observed by low energy electron diffractio…
Evidence for quasi-one-dimensional charge density wave in CuTe by angle-resolved photoemission spectroscopy
Kenan Zhang, Xiaoyu Liu, Haoxiong Zhang +10
We report the electronic structure of CuTe with a high charge density wave (CDW) transition temperature Tc = 335 K by angle-resolved photoemission spectroscopy (ARPES). An anisotro…
Barkhausen effect in the first order structural phase transition in type-II Weyl semimetal MoTe2
Chuanwu Cao, Xin Liu, Xiao Ren +7
We report the first observation of the non-magnetic Barkhausen effect in van der Waals layered crystals, specifically, between the Td and 1T' phases in type-II Weyl semimetal MoTe2…
Widely tunable band gap in a multivalley semiconductor SnSe by potassium doping
Kenan Zhang, Ke Deng, Jiaheng Li +6
SnSe, a group IV-VI monochalcogenide with layered crystal structure similar to black phosphorus, has recently attracted extensive interests due to its excellent thermoelectric prop…
Quasicrystalline 30° Twisted Bilayer Graphene as an Incommensurate Superlattice with Strong Interlayer Coupling
Wei Yao, Eryin Wang, Changhua Bao +9
The interlayer coupling can be used to engineer the electronic structure of van der Waals heterostructures (superlattices) to obtain properties that are not possible in a single ma…
Extremely Large Magnetoresistance and Electronic Structure of TmSb
Yi-Yan Wang, Hongyun Zhang, Xiao-Qin Lu +6
We report the magneto-transport properties and the electronic structure of TmSb. TmSb exhibits extremely large transverse magnetoresistance and Shubnikov-de Haas (SdH) oscillation…
Ultrafast Electronic Dynamics of a Weyl Semimetal MoTe Revealed by Time and Angle Resolved Photoemission Spectroscopy
Guoliang Wan, Wei Yao, Kenan Zhang +5
A Weyl semimetal is a new type of topological quantum phase with intriguing physics near the Weyl nodes. Although the equilibrium state of Weyl semimetals has been investigated, th…
High quality atomically thin PtSe2 films grown by molecular beam epitaxy
Mingzhe Yan, Eryin Wang, Xue Zhou +13
Atomically thin PtSe2 films have attracted extensive research interests for potential applications in high-speed electronics, spintronics and photodetectors. Obtaining high quality…
Experimental evidence of type-II Dirac fermions in PtSe2
Kenan Zhang, Mingzhe Yan, Haoxiong Zhang +6
Topological semimetals have attracted extensive research interests for realizing condensed matter physics counterparts of three-dimensional Dirac and Weyl fermions, which were orig…
Stacking-dependent electronic structure of trilayer graphene resolved by nanospot angle-resolved photoemission spectroscopy
Changhua Bao, Wei Yao, Eryin Wang +4
The crystallographic stacking order in multilayer graphene plays an important role in determining its electronic structure. In trilayer graphene, rhombohedral stacking (ABC) is par…
Electronic structure of transferred graphene/h-BN van der Waals heterostructures with nonzero stacking angles by nano-ARPES
Eryin Wang, Guorui Chen, Guoliang Wan +8
In van der Waals heterostructures, the periodic potential from the Moiré superlattice can be used as a control knob to modulate the electronic structure of the constituent material…
Lorentz-violating type-II Dirac fermions in transition metal dichalcogenide PtTe
Mingzhe Yan, Huaqing Huang, Kenan Zhang +13
Topological semimetals have recently attracted extensive research interests as host materials to condensed matter physics counterparts of Dirac and Weyl fermions originally propose…
Type-II Dirac fermions in the PtSe class of transition metal dichalcogenides
Huaqing Huang, Shuyun Zhou, Wenhui Duan
Recently, a new "type-II" Weyl fermion, which exhibits exotic phenomena such as angle-dependent chiral anomaly, was discovered in a new phase of matter where electron and hole pock…
Raman signatures of inversion symmetry breaking and structural phase transition in type-II Weyl semimetal MoTe2
Kenan Zhang, Changhua Bao, Qiangqiang Gu +7
Transition metal dichalcogenide MoTe is an important candidate for realizing the newly predicted type-IIWeyl fermions, for which the breaking of the inversion symmetry is a pre…
Direct observation of local Rashba spin polarization and spin-layer locking in centrosymmetric monolayer PtSe
Wei Yao, Eryin Wang, Huaqing Huang +10
The generally accepted view that spin polarization is induced by the asymmetry of the global crystal space group has limited the search for spintronics [1] materials to non-centros…