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Gate-tunable quantum pathways of high harmonic generation in graphene
Soonyoung Cha, Minjeong Kim, Youngjae Kim +14
Under strong laser fields, electrons in solids radiate high-harmonic fields by travelling through quantum pathways in Bloch bands in the sub-laser-cycle timescales. Understanding t…
γ-GeSe:a new hexagonal polymorph from group IV-VI monochalcogenides
Sol Lee, Joong-Eon Jung, Han-gyu Kim +12
The family of group IV-VI monochalcogenides has an atomically puckered layered structure, and their atomic bond configuration suggests the possibility for the realization of variou…
Strongly-bound excitons and trions in anisotropic 2D semiconductors
Sangho Yoon, Taeho Kim, Seung-Young Seo +9
Monolayer and few-layer phosphorene are anisotropic quasi-two-dimensional (quasi-2D) van der Waals (vdW) semiconductors with a linear-dichroic light-matter interaction and a widely…
Evidence of Higher Order Topology in Multilayer WTe from Josephson Coupling through Anisotropic Hinge States
Yong-Bin Choi, Yingming Xie, Chui-Zhen Chen +12
The noncentrosymmetric Td-WTe, previously known as a type-II Weyl semimetal, is expected to have higher order topological phases with topologically protected, helical one-dimen…
The role of momentum-dark excitons in the elementary optical response of bilayer WSe
Jessica Lindlau, Malte Selig, Andre Neumann +6
Monolayer (ML) transition metal dichalcogenides (TMDs) undergo substantial changes in the single-particle band structure and excitonic optical response upon the addition of just on…
Ultrafast Charge Transfer in Atomically Thin MoS2/WS2 Heterostructures
Xiaoping Hong, Jonghwan Kim, Su-Fei Shi +7
Van der Waals heterostructures have recently emerged as a new class of materials, where quantum coupling between stacked atomically thin two-dimensional (2D) layers, including grap…
Ultrafast Generation of Pseudo-magnetic Field for Valley Excitons in WSe2 Monolayers
Jonghwan Kim, Xiaoping Hong, Chenhao Jin +5
A new degree of freedom, the valley pseudospin, emerges in atomically thin two-dimensional transition metal dichalcogenides (MX2) and has attracted great scientific interest. The c…
Electrical Control of Silicon Photonic Crystal Cavity by Graphene
Arka Majumdar, Jonghwan Kim, Jelena Vuckovic +1
Efficient conversion of electrical signal to optical signal in nano-photonics enables solid state integration of electronics and photonics. Combination of graphene with photonic cr…