Article
Chemistry, Multidisciplinary
Anil Kumar Rajapitamahuni, Anusha Kamath Manjeshwar, Avinash Kumar, Animesh Datta, Praneeth Ranga, Laxman Raju Thoutam, Sriram Krishnamoorthy, Uttam Singisetti, Bharat Jalan
Summary: In this study, the highly reversible, electrostatic doping of beta-Ga2O3 films with tunable carrier densities using ion-gel-gated electric double-layer transistor configuration was reported. The plasmon-phonon coupling that dictates electron transport properties was investigated, and it was found that the room-temperature mobility initially increased and then decreased with increasing carrier density due to the plasmon-phonon coupling. The study also revealed the important antiscreening effect arising from dynamic screening of the electron-phonon interactions from the hybrid plasmon-phonon modes. Higher room-temperature mobility can be achieved by harnessing the dynamic screening of the electron-phonon interactions.
Article
Multidisciplinary Sciences
Hong Zhou, Zhihao Ren, Dongxiao Li, Cheng Xu, Xiaojing Mu, Chengkuo Lee
Summary: The failure of molecular identification due to the overlap of infrared vibrational fingerprints is a fundamental issue in infrared spectroscopy. This study investigates the coupling mode of localized surface plasmon and surface phonon polaritons to disentangle overlapping vibrational modes. The researchers find that the refractive index dependence of surface phonon polaritons vibrations effectively achieves high identification accuracy for strongly overlapping vibrational modes.
NATURE COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Gergely Nemeth, Keigo Otsuka, Daniel Datz, Aprimeron Pekker, Shigeo Maruyama, Ferenc Borondics, Katalin Kamaras
Summary: The ultrastrong coupling of light and matter provides new opportunities for modifying chemical reactions and developing novel nanoscale devices. In this study, we investigated the interaction between one-dimensional Luttinger-liquid plasmons in metallic carbon nanotubes and surface phonon polaritons of silica and hexagonal boron nitride. The dispersion relation of the hybrid Luttinger-liquid plasmon-phonon polaritons (LPPhPs) was extracted and explained using the coupled harmonic oscillator model. The findings suggest potential applications of carbon nanotube plasmons in nanoscale plasmonic circuits and ultrasensitive molecular sensing.
Article
Optics
Chenran Xu, Han Cai, Da-Wei Wang
Summary: The research team proposed a new configuration based on the Tamm structure to support the excitation of PhPs in both transverse-electric and transverse-magnetic modes, achieving VSC in a 300 nm thick molecular layer. This study provides a new platform for sensing vibrational modes in free space and controlling chemical reactions.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Alexey Y. Nikitin, Rainer Hillenbrand, Andrei Bylinkin, Francesco Calavalle, Maria Barra-Burillo, Roman V. Kirtaev, Elizaveta Nikulina, Evgeny Modin, Eli Janzen, James H. Edgar, Felix Casanova, Luis E. Hueso, Valentyn S. Volkov, Paolo Vavassori, Igor Aharonovich, Pablo Alonso-Gonzalez
Summary: Strong coupling between light and matter excitations in both mid-IR and visible frequency bands is achieved by introducing polaritonic nanoresonators, which can manipulate material properties and have potential applications in optoelectronics, nanophotonics, and quantum information.
Article
Chemistry, Multidisciplinary
Ting-Xiao Qin, En-Ming You, Jia-Ye Zhang, Hai-Long Wang, Kelvin H. L. Zhang, Bing-Wei Mao, Zhong-Qun Tian
Summary: In this study, we used infrared-spectroscopic nanoimaging to investigate the interaction of electron-phonon coupling and the spatial distribution of local charge carriers at the oxide heterointerface. We found an increased dielectric constant and charge carrier density near the heterointerface. The relationship between charge carrier density and extension thickness across the heterointerface was also quantitatively determined using monochromatic near-field imaging.
Article
Materials Science, Multidisciplinary
Y. in't Veld, M. Katsnelson, A. J. Millis, M. Rosner
Summary: The coupling between electrons and plasmons in two-dimensional metals has a significant impact on superconductivity. This study investigates the interplay between electron-electron and electron-phonon interactions in the theory of 2D superconductivity using a one-loop theory with accurate treatment of electron-phonon, electron-plasmon, and phonon-plasmon coupling. The results show that the strength of the Coulomb interaction and external screening can control the enhancement or suppression of superconductivity.
Article
Chemistry, Multidisciplinary
Mathieu Mirjolet, Francisco Rivadulla, Premysl Marsik, Vladislav Borisov, Roser Valenti, Josep Fontcuberta
Summary: The article discusses the physics of strongly correlated electronic systems in transition metal oxides, using SrVO3 as an example to illustrate the limitations of electron-electron correlations in a Fermi liquid.
Article
Multidisciplinary Sciences
Qiankun Zhang, Cheng Yang, Jiteng Sheng, Haibin Wu
Summary: In this study, we experimentally demonstrate a mechanism of generating phonon lasers from the dissipative coupling and reveal the differences between our method and conventional phonon lasers. The findings can be applied to various disciplines such as optics, acoustics, and quantum many-body physics.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Chemistry, Physical
Lu Cheng, Yanming Zhu, Weiliang Wang, Wei Zheng
Summary: This study carefully investigates the temperature dependence of self-trapped exciton emission and optical absorption edge in monoclinic gallium oxide. The results show that with increasing temperature, both the self-trapped exciton and the direct bandgap exhibit significant broadening and red shift. These temperature-dependent changes are attributed to the strong electron-phonon coupling effect caused by the high localization of carriers in the crystal. This finding emphasizes the importance of considering lattice vibrations in the process of carrier absorption and photon release.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2022)
Article
Chemistry, Physical
Zhongyu Liu, Yingwei Li, Wonyong Shin, Rongchao Jin
Summary: This study compared thin-film and solution-based measurements to reveal the existence of core phonons in Au-25 nanoclusters, as well as the suppression mechanism of staple-shell phonons in the solid state.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Chemistry, Physical
Luca Tomarchio, Lorenzo Mosesso, Salvatore Macis, Loi T. Nguyen, Antonio Grilli, Martina Romani, Mariangela Cestelli Guidi, Robert J. Cava, Stefano Lupi
Summary: We report the far-infrared, temperature-dependent optical properties of a CrI3 single crystal, which is a van der Waals ferromagnet with a Curie temperature of 61 K. In addition to the expected phonon modes determined by the crystalline symmetry, the optical reflectance and transmittance spectra of CrI3 single crystals show many other excitations as a result of strong lattice anharmonicity and spin-phonon coupling. This complex vibrational spectrum highlights the entangled interactions among different degrees of freedom in CrI3.
Article
Materials Science, Multidisciplinary
Jiaxuan Xu, Yue Hu, Xiulin Ruan, Xinyu Wang, Tianli Feng, Hua Bao
Summary: In the heat conduction process of nanomaterials, different phonons may exhibit different temperatures at the same location, known as the local phonon nonequilibrium phenomenon. The study reveals that phonon-phonon coupling can lead to new trends in nonequilibrium phonon temperature gradients, where diffusive phonons may decrease to lattice temperature and some semiballistic phonons may surpass diffusive phonons in temperature gradient. This finding provides insights for understanding and predicting phonon nonequilibrium temperatures within nanodevices.
Article
Chemistry, Multidisciplinary
Matthew Gebert, Semonti Bhattacharyya, Christopher C. Bounds, Nitu Syed, Torben Daeneke, Michael S. Fuhrer
Summary: We demonstrate a large-area passivation layer for graphene by transferring ultrathin amorphous Ga2O3 synthesized on liquid Ga metal. The passivated graphene maintains its high mobility and shows reduced resistivity over a range of temperatures, thanks to the interplay of Ga2O3's high-dielectric-constant screening and its high characteristic phonon frequencies. Ga2O3 passivation also protects graphene from further processing like plasma-enhanced atomic layer deposition of Al2O3, as indicated by Raman spectroscopy and electrical measurements.
Article
Materials Science, Multidisciplinary
Benjamin M. Janzen, Piero Mazzolini, Roland Gillen, Andreas Falkenstein, Manfred Martin, Hans Tornatzky, Janina Maultzsch, Oliver Bierwagen, Markus R. Wagner
Summary: The study investigates the phonon modes of beta-Ga2O3 in different oxygen isotope compositions and reveals that the substitution of oxygen isotopes affects the Raman frequencies. By conducting experiments and theoretical calculations, the study identifies the atomistic origin of Raman modes and presents a blueprint for future identification of different point defects in Ga2O3 using Raman spectroscopy.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)