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Articles by Yangchen He
Achieving Large Uniaxial and Homogeneous Strain in Two-Dimensional Materials
1 Introduction Strain in crystalline materials can strongly modify the electronic band structure and carrier interactions, enabling controlled tuning of their electronic [1, 2], optical [3], and magnetic properties [4]. Even modest values of strain ( < $<$ 1%) can impact sensitive materials properties, such as superconductivity [5-7] and correlated electronic states [8].
Electrostatic quantum nanocorral for composite charged excitons
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Abstract A tunable interface between flying photons and stationary quantum states is important for quantum networks. Quantum-confined charged excitons are attractive in this context because they combine single-photon emission with localized charge states. However, realizing nanoscale electrostatic confinement that is reversible, robust and spectroscopically resolvable remains challenging.
By Zhe Sun, Mohamed Shehabeldin, Jian Tang, Mingyang Guo, Zumeng Huang, Tianxing Tang, Tiema Qian, Vsevolod Belosevich, Thomas Ding, Yangchen He, Michael Geiwitz, Kenji Watanabe, Takashi Taniguchi, Efrén Navarro-Moratalla, Daniel Rhodes, Chun Hung Lui, Su-Yang Xu, Qiong Ma, Jingdi Tang, Ivona Košić, Kenneth Stephen Burch
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Nature
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Hybrid tungsten oxyselenide/graphene electrodes for near-lossless 2D semiconductor phase modulators - Light: Science & Applications
Abstract Optical phase modulators are critical components in integrated photonics, but conventional designs suffer from a trade-off between modulation efficiency and optical loss. Two-dimensional materials like graphene offer strong electro-optic effects, yet their high optical absorption at telecom wavelengths leads to significant insertion losses.
Probing interplay of topological properties and electron correlation in TaIrTe4 via nonlinear Hall effect - Nature Communications
Abstract Studying the interplay of electron correlation and topology is crucial for discovering new quantum states, such as the fractional quantum spin Hall effect and topological superconductors. Unlike linear transport, nonlinear electrical responses, which encode both symmetry and topological features remain largely unexplored in systems with electron correlation and topology.
Terahertz sensing based on the nonlinear electrodynamics of the two-dimensional correlated topological semimetal TaIrTe4 - Nature Electronics
Abstract The development of terahertz-sensing technologies has been limited by the lack of sensitive, broadband and fast terahertz detectors. Thermal bolometers are bulky and slow, whereas electronic terahertz detectors (such as Schottky diodes) are fast, but their sensitivity degrades quickly outside a narrow frequency window.
Quantum melting of generalized electron crystal in twisted bilayer MoSe2 - Nature Communications
Abstract Electrons can form an ordered solid crystal phase ascribed to the interplay between Coulomb repulsion and kinetic energy. Tuning these energy scales can drive a phase transition from electron solid to liquid, i.e., melting of Wigner crystal. Generalized Wigner crystals (GWCs) pinned to moiré superlattices have been reported by optical and scanning-probe-based methods.
Evidence for Topological States and a Lifshitz Transition in Metastable 2M‐WSe2
Conflict of Interest The authors declare no conflict of interest. Supporting Information Filename Description adfm202420356-sup-0001-SuppMat.pdf4.8 MB Supporting Information References 1, , , , , Phys. Rev. Lett. 2010, 105, 136805. 2, , , , , Nat. Nanotechnol. 2012, 7, 699. 3, , , , , , , , , Phys. Rev. Lett. 2016, 117, 056805. 4, , , , , , , Nature 2015, 527, 495. 5, , , , Science 2014, 346, 1344. 6, , , , , , , Science 2018, 359, 76. 7, , , , , , , , , , Nat. Phys. 2017, 13, 677.
Valley charge-transfer insulator in twisted double bilayer WSe2 - Nature Communications
Abstract In flat-band systems, emergent physics can be substantially modified by the presence of another nearby electronic band. For example, a Mott˘Hubbard insulator can turn into a charge transfer insulator if other electronic states enter between the upper and lower Hubbard bands. Here, we introduce twisted double bilayer (TDB) WSe2, with twist angles near 60°, as a controllable platform in which the K-valley band can be tuned to close vicinity of the Γ-valley moiré flat band.
Observation of Multi-Phonon Emission in Monolayer WS2 on Various Substrates
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