148 citations · 364 across the 23 of their papers we have counts for
23 papers
Direct Measurement of Exciton Dispersion in the Long-Wavelength Limit
Peiyi He, Jiade Li, Jiakai Wang +15
Exciton dispersion, which governs the propagation, scattering and radiative decay of electron-hole pairs, is essential to optoelectronics and quantum materials. In two-dimensional…
Nanoscale Thermal Imaging of Dislocation-Mediated Heat Transport
Ruilin Mao, Bingyao Liu, Jiaxin Liu +7
Dislocations in crystalline materials are widely exploited to tailor the thermal conductivity of semiconductors and thermoelectrics, yet a critical gap persists: direct measurement…
Monolithic integration of diverse crystalline thin films on diamond for near-junction thermal management
Tiancheng Zhao, Tianqi Bai, Yang He +20
The pursuit of extreme miniaturization and high power in 6G RF front-ends has cast thermal dissipation as the central challenge. Here, we have demonstrated the monolithic integrati…
Resolving Phonons in Superconductor Bi2Sr2CaCu2O8+δ at Sub-Unit-Cell Resolution
Xiaowen Zhang, Jiade Li, Xiaoyue Gao +9
The role of phonons in cuprates remains controversial, with their complex lattice structure complicating the investigation. Here, we identify phonon modes originating from charge r…
Strongly confined Mid-infrared to Terahertz Phonon Polaritons in Ultra-thin SrTiO3
Peiyi He, Jiade Li, Cong Li +7
Phonon polaritons (PhPs) enable subwavelength light control for infrared sensing, imaging, and optoelectronics, but conventional polar materials have narrow Reststrahlen bands, lim…
Precise structure and polarization determination of Hf0.5Zr0.5O2 with electron ptychography
Xiaoyue Gao1, Zhuohui Liu, Bo Han +8
Hf0.5Zr0.5O2 (HZO) is a promising candidate for next generation ferroelectric memories and transistors. However, its ferroelectricity origin is still under debate due to the comple…
Single-atom-resolved vibrational spectroscopy of a dislocation
Hailing Jiang, Tao Wang, Zhenyu Zhang +10
Phonon resistance from dislocation scattering is often divided into short-range core interactions and long-range strain field interactions. Using electron energy-loss spectroscopy…
Atomic-scale mechanism of enhanced electron-phonon coupling at the interface of MgB thin film
Xiaowen Zhang, Tiequan Xu, Ruochen Shi +7
In this study, we explore the heterointerface of MgB film on SiC substrate at atomic scale using electron microscopy and spectroscopy. We detect ~1 nm MgO between MgB and S…
Atomic-scale observation of localized phonons at FeSe/SrTiO3 interface
Ruochen Sh, Qize Li, Xiaofeng Xu +11
In single unit-cell FeSe grown on SrTiO3, the superconductivity transition temperature features a significant enhancement. Local phonon modes at the interface associated with elect…
Atomically localized ingredient-dependent interface phonon in heterogeneous solids
Mei Wu, Ruochen Shi, Ruishi Qi +12
Phonons are the primary heat carriers in non-metallic solids. In compositionally heterogeneous materials, the thermal properties are believed to be mainly governed by the disrupted…
Phonon transition across an isotopic interface
Ning Li, Ruochen Shi, Yifei Li +13
Natural materials usually consist of isotopic mixtures, for which different isotopic ratios can lead to distinct material properties such as thermal conductivity and nucleation pro…
Tunable Interband Transitions in Twisted h-BN/Graphene Heterostructures
Bingyao Liu, Yu-Tian Zhang, Ruixi Qiao +12
In twisted h-BN/graphene heterostructures, the complex electronic properties of the fast-traveling electron gas in graphene are usually considered to be fully revealed. However, th…
Single-dislocation phonons: atomic-scale measurement and their thermal properties
Yuehui Li, Bo Han, Xiaolong Yang +12
Nanoscale defects such as dislocations, have a significant impact on the phonon thermal transport properties in non-metallic materials. To unravel these effects, understanding of d…
Electron microscopy probing electron-photon interactions in SiC nanowires with ultra-wide energy and momentum match
Jinlong Du, Jin-hui Chen, Yuehui Li +4
Nanoscale materials usually can trap light and strongly interact with it leading to many photonic device applications. The light-matter interactions are commonly probed by optical…
Direct observation of local antiferroelectricity induced phonon softening at a SrTiO3 defect
Bo Han, Ruochen Shi, Huining Peng +7
Defects in oxides usually exhibit exotic properties that may be associated with the local lattice dynamics. Here, at atomic spatial resolution, we directly measure phonon modes of…
Suppression of ferromagnetism and influence of disorder in silicon-substituted CeRh6Ge4
Y. J. Zhang, Z. Y. Nie, R. Li +10
We report a study of isoelectronic chemical substitution in the recently discovered quantum critical ferromagnet CeRhGe. Upon silicon-doping, the ferromagnetic ordering tem…
Approaching the Purcell factor limit with whispering-gallery hyperbolic phonon polaritons in hBN nanotubes
Xiangdong Guo, Ning Li, Xiaoxia Yang +9
Enhanced light-matter interaction at the nanoscale is pivotal in the foundation of nonlinear optics, quantum optics, and nanophotonics, which are essential for a vast range of appl…
Electric-field control of the nucleation and motion of isolated three-fold polar vertices
Mingqiang Li, Tiannan Yang, Pan Chen +12
Recently various topological polar structures have been discovered in oxide thin films. Despite the increasing evidence of their switchability under electrical and/or mechanical fi…
Atomic-Scale Probing of Heterointerface Phonon Bridges in Nitride Semiconductor
Yue-Hui Li, Rui-Shi Qi, Ruo-Chen Shi +12
Interface phonon modes that are generated by several atomic layers at the heterointerface play a major role in the interface thermal conductance for nanoscale high-power devices su…
Measuring phonon dispersion at an interface
Ruishi Qi, Ruochen Shi, Yuanwei Sun +9
The breakdown of translational symmetry at heterointerfaces leads to the emergence of new phonon modes localized near the interface. These interface phonons play an essential role…
Four-dimensional Vibrational Spectroscopy for Nanoscale Mapping of Phonon Dispersion in BN Nanotubes
Ruishi Qi, Ning Li, Jinlong Du +8
Direct measurement of local phonon dispersion in individual nanostructures can greatly advance our understanding of their electrical, thermal, and mechanical properties. However, s…
Correlating the Electronic Structures of Metallic/Semiconductor MoTe2 Interface to its Atomic Structures
Bo Han, Chen Yang, Xiaolong Xu +8
Contact interface properties are important in determining the performances of devices based on atomically thin two-dimensional (2D) materials, especially those with short channels.…
Nanoscale Probing of Localized Surface Phonon Polaritons in SiC Nanorods with Swift Electrons
Yuehui Li, Ruishi Qi, Ruochen Shi +4
Surface phonon polaritons hold much potential for subwavelength control and manipulation of light at the infrared to terahertz wavelengths. Here, aided by monochromatic scanning tr…