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14 papers
Broken Kramers' degeneracy in altermagnetic MnTe
Suyoung Lee, Sangjae Lee, Saegyeol Jung +9
Altermagnetism is a newly identified fundamental class of magnetism with vanishing net magnetization and time-reversal symmetry broken electronic structure. Probing the unusual ele…
Direct observation of orbital driven strong interlayer coupling in puckered two-dimensional PdSe2
Jung Hyun Ryu, Jeong-Gyu Kim, Bongjae Kim +6
Interlayer coupling between individual unit layers has played a critical role for layer-dependent properties in two-dimensional (2D) materials. While recent studies have revealed t…
Semimetallic Nature and Magnetic Polarons in EuB6 Studied by Angle-Resolved Photoemission Spectroscopy
Chul-Hee Min, Boyoun Kang, Beong Ki Cho +3
Temperature-dependent angle-resolved photoemission spectroscopy (ARPES) was carried out on single-crystalline EuB6 samples. By measuring ARPES spectra in an extended Brillouin zone…
Twofold van Hove singularity and origin of charge order in topological kagome superconductor CsV3Sb5
Mingu Kang, Shiang Fang, Jeong-Kyu Kim +14
The layered vanadium antimonides AV3Sb5 (A = K, Rb, Cs) are a recently discovered family of topological kagome metals with a rich phenomenology of strongly correlated electronic ph…
Gapped Nearly Free-Standing Graphene on an SiC(0001) Substrate Induced by Manganese Atoms
Jinwoong Hwang, Ji-Eun Lee, Minhee Kang +4
The electron band structure of manganese-adsorbed graphene on an SiC(0001) substrate has been studied using angle-resolved photoemission spectroscopy. Upon introducing manganese at…
Emergence of Kondo resonance in graphene intercalated with cerium
Jinwoong Hwang, Kyoo Kim, Hyejin Ryu +11
The interaction between a magnetic impurity, such as cerium (Ce) atom, and surrounding electrons has been one of the core problems in understanding many-body interaction in solid a…
Atomically Abrupt Topological p-n Junction
Sung Hwan Kim, Kyung-Hwan Jin, Byung Woo Kho +4
Topological insulators (TI's) are a new class of quantum matter with extraordinary surface electronic states, which bear great potential for spintronics and error-tolerant quantum…
Charge-spin correlation in van der Waals antiferromagenet NiPS3
So Yeun Kim, Tae Yun Kim, Luke J. Sandilands +13
Strong charge-spin coupling is found in a layered transition-metal trichalcogenide NiPS3, a van derWaals antiferromagnet, from our study of the electronic structure using several e…
Element-Specific Orbital Character in a Nearly-Free-Electron Superconductor AgPbO Revealed by Core-Level Photoemission
Soobin Sinn, Kyung Dong Lee, Choong Jae Won +8
AgPbO has attracted considerable attention due to its novel nearly-free-electron superconductivity, but its electronic structure and orbital character of the Cooper-pai…
Experimental Realization of Type-II Dirac Fermions in PdTe Superconductor
Han-Jin Noh, Jinwon Jeong, En-Jin Cho +3
A Dirac fermion in a topological Dirac semimetal is a quadruple-degenerate quasi-particle state with a relativistic linear dispersion. Breaking either time-reversal or inversion sy…
Electronic Structure of the Kitaev Material - Probed by Photoemission and Inverse Photoemission Spectroscopies
Soobin Sinn, Choong Hyun Kim, Beom Hyun Kim +11
Recently, - has attracted much attention as a possible material realization of the honeycomb Kitaev model, which may stabilize a quantum-spin-liquid state. Comp…
Observation of tunable bandgap and anisotropic Dirac semimetal state in black phosphorus
Jimin Kim, Seung Su Baik, Sae Hee Ryu +7
Black phosphorus consists of stacked layers of phosphorene, a two-dimensional semiconductor with promising device characteristics. We report the realization of a widely tunable ban…
Controlling the 2DEG states evolution at a metal/BiSe interface
Han-Jin Noh, Jinwon Jeong, En-Jin Cho +5
We have demonstrated that the evolution of the two-dimensional electron gas (2DEG) system at an interface of metal and the model topological insulator (TI) BiSe can be cont…
Novel Jeff = 1/2 Mott State Induced by Relativistic Spin-Orbit Coupling in Sr2IrO4
B. J. Kim, Hosub Jin, S. J. Moon +11
We investigated electronic structure of 5d transition-metal oxide Sr2IrO4 using angle-resolved photoemission, optical conductivity, and x-ray absorption measurements and first-prin…