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Pressure tunable quantum anomalous Hall states in a topological antiferromagnet
Su Kong Chong, Chao Lei, Jie Li +8
Mechanical modulation of the lattice parameter can modify the electronic structure and manipulate the magnetic coupling of a material without introducing impurities. Inspired by su…
Fermi Surface Evolution and Anomalous Hall Effect in an Ideal Type-II Weyl Semimetal
Qianni Jiang, Johanna C. Palmstrom, John Singleton +11
Weyl semimetals (WSMs) are three-dimensional topological materials that exhibit fascinating properties due to the presence of Weyl nodes in their band structure. However, existing…
Structural tuning magnetism and topology in a magnetic topological insulator
Christopher Eckberg, Gang Qiu, Tao Qu +10
To date, the most widely-studied quantum anomalous Hall insulator (QAHI) platform is achieved by dilute doping of magnetic ions into thin films of the alloyed tetradymite topologic…
Surprisingly large anomalous Hall effect and giant negative magnetoresistance in half-topological semimetals
Yanglin Zhu, Cheng-Yi Huang, Yu Wang +9
Large intrinsic anomalous Hall effect (AHE) due to the Berry curvature in magnetic topological semimetals is attracting enormous interest due to its fundamental importance and tech…
Correlated states of 2D electrons near the Landau level filling
Yoon Jang Chung, D. Graf, L. W. Engel +6
The ground state of two-dimensional electron systems (2DESs) at low Landau level filling factors () has long been a topic of interest and controversy in condensed mat…
High Fermi velocities and small cyclotron masses in LaAlGe
Zhixiang Hu, Qianheng Du, Yu Liu +2
We report quantum oscillation measurements of LaAlGe, a Lorentz-violating type-II Weyl semimetal with tilted Weyl cones. Very small quasiparticle masses and very high Fermi velocit…
Exceptionally large anomalous Hall effect due to anticrossing of spin-split bands in the antiferromagnetic half-Heusler compound TbPtBi
Yanglin Zhu, Bahadur Singh, Yu Wang +9
We have investigated magnetotransport properties and the topological electronic structure of the half-Heusler compound TbPtBi. Our experiments reveal an exceptionally large anomalo…
Switching 2D Magnetic States via Pressure Tuning of Layer Stacking
Tiancheng Song, Zaiyao Fei, Matthew Yankowitz +15
The physical properties of two-dimensional van der Waals (2D vdW) crystals depend sensitively on the interlayer coupling, which is intimately connected to the stacking arrangement…
Tuning superconductivity in twisted bilayer graphene
Matthew Yankowitz, Shaowen Chen, Hryhoriy Polshyn +5
Materials with flat electronic bands often exhibit exotic quantum phenomena owing to strong correlations. Remarkably, an isolated low-energy flat band can be induced in bilayer gra…
Non-Classical Longitudinal Magneto-Resistance in Anisotropic Black Phosphorus
Francesca Telesio, Nicholas Hemsworth, William Dickerson +11
Resistivity measurements of a few-layer black phosphorus (bP) crystal in parallel magnetic fields up to 45 T are reported as a function of the angle between the in-plane field and…
Absence of Dirac states in BaZnBi induced by spin-orbit coupling
Weijun Ren, Aifeng Wang, D. Graf +4
We report magnetotransport properties of BaZnBi single crystals. Whereas electronic structure features Dirac states, such states are removed from the Fermi level by spin-orbi…
Dynamic band structure tuning of graphene moiré superlattices with pressure
Matthew Yankowitz, Jeil Jung, Evan Laksono +7
Heterostructures of atomically-thin materials have attracted significant interest owing to their ability to host novel electronic properties fundamentally distinct from their const…
Large magnetoresistance and Fermi surface study of SbSeTe single crystal
K. Shrestha, V. Marinova, D. Graf +2
We have studied the magnetotransport properties of a SbSeTe single crystal. Magnetoresistance (MR) is maximum when the magnetic field is perpendicular to the sample surface…
Interlayer electronic transport in CaMnBi antiferromagnet
Aifeng Wang, D. Graf, Lijun Wu +4
We report interlayer electronic transport in CaMnBi single crystals. Quantum oscillations and angular magnetoresistance suggest coherent electronic conduction and valley pola…
Large magnetothermopower and Fermi surface reconstruction in SbTeSe
Kefeng Wang, D. Graf, C. Petrovic
We report the magnetoresistance, magnetothermopower and quantum oscillation study of SbTeSe single crystal. The in-plane transverse magnetoresistance exhibits a crossover a…
Quasi-two-dimensional Dirac fermions and quantum magnetoresistance in LaAgBi
Kefeng Wang, D. Graf, C. Petrovic
We report quasi-two-dimensional Dirac fermions and quantum magnetoresistance in LaAgBi. The band structure shows several narrow bands with nearly linear energy dispersion and D…
Two-dimensional Dirac fermions in YbMnBi2 antiferromagnet
Aifeng Wang, I. Zaliznyak, Weijun Ren +7
We report two-dimensional quantum transport and Dirac fermions in YbMnBi2 single crystals. YbMnBi2 is a layered material with anisotropic conductivity and magnetic order below 290…
Inter-planar coupling dependent magnetoresistivity in high purity layered metals
N. Kikugawa, P. Goswami, A. Kiswandhi +15
The magnetic field-induced changes in the conductivity of metals are the subject of intense interest, both for revealing new phenomena and as a valuable tool for determining their…
Evidence of topological two-dimensional metallic surface states in thin bismuth nanoribbons
Wei Ning, Fengyu Kong, Chuanying Xi +7
Understanding of the exotic quantum phenomena in bulk bismuth beyond its ultraquantum limit still remains controversial and gives rise to a renewed interest. The focus of the issue…
Coulomb oscillations in three-layer graphene nanostructures
J. Guettinger, C. Stampfer, F. Molitor +3
We present transport measurements on a tunable three-layer graphene single electron transistor (SET). The device consists of an etched three-layer graphene flake with two narrow co…
Tunable Coulomb blockade in nanostructured graphene
C. Stampfer, J. Guettinger, F. Molitor +3
We report on Coulomb blockade and Coulomb diamond measurements on an etched, tunable single-layer graphene quantum dot. The device consisting of a graphene island connected via two…
Raman imaging and electronic properties of graphene
F. Molitor, D. Graf, C. Stampfer +2
Graphite is a well-studied material with known electronic and optical properties. Graphene, on the other hand, which is just one layer of carbon atoms arranged in a hexagonal latti…
Local gating of a graphene Hall bar by graphene side gates
F. Molitor, J. Güttinger, C. Stampfer +3
We have investigated the magnetotransport properties of a single-layer graphene Hall bar with additional graphene side gates. The side gating in the absence of a magnetic field can…
Phase coherent transport in a side-gated mesoscopic graphite wire
D. Graf, F. Molitor, T. Ihn +1
We investigate the magnetotransport properties of a thin graphite wire resting on a silicon oxide substrate. The electric field effect is demonstrated with back and side gate elect…