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Wu S, Chu W, Lu Y, Ji M. Imaging Ultrafast Dynamics of Pressure-Driven Phase Transitions in Black Phosphorus and Anomalous Coherent Phonon Softening. Nano Lett 2024; 24:424-432. [PMID: 38153402 DOI: 10.1021/acs.nanolett.3c04218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2023]
Abstract
Applying high pressure to effectively modulate the electronic and lattice structures of materials could unravel various physical properties associated with phase transitions. In this work, high-pressure-compatible femtosecond pump-probe microscopy was constructed to study the pressure-dependent ultrafast dynamics in black phosphorus (BP) thin films. We observed pressure-driven evolution of the electronic topological transition and three structural phases as the pressure reached ∼22 GPa, which could be clearly differentiated in the transient absorption images containing spatially resolved ultrafast carrier and coherent phonon dynamics. Surprisingly, an anomalous coherent acoustic phonon mode with pressure softening behavior was observed within the range of ∼3-8 GPa, showing distinct laser power and time dependences. Density functional theory calculations show that this mode, identified as the shear mode along the armchair orientation, gains significant electron-phonon coupling strength from out-of-plane compression that leads to decreased phonon frequency. Our results provide insights into the structure evolution of BP with pressure and hold potential for applications in microelectromechanical devices.
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Affiliation(s)
- Simin Wu
- State Key Laboratory of Surface Physics and Department of Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Shanghai Key Laboratory of Metasurfaces for Light Manipulation, Fudan University, Shanghai 200433, China
| | - Weibin Chu
- State Key Laboratory of Surface Physics and Department of Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Shanghai Key Laboratory of Metasurfaces for Light Manipulation, Fudan University, Shanghai 200433, China
- Key Laboratory of Computational Physical Science (MOE) and Institute of Computational Physical Science, Fudan University, Shanghai 200433, China
| | - Yang Lu
- Center for High Pressure Science & Technology Advanced Research, Shanghai 201203, China
- Shanghai Key Laboratory of Material Frontiers Research in Extreme Environments (MFree), Shanghai Advanced Research in Physical Sciences (SHARPS), Shanghai 201203, China
| | - Minbiao Ji
- State Key Laboratory of Surface Physics and Department of Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education), Shanghai Key Laboratory of Metasurfaces for Light Manipulation, Fudan University, Shanghai 200433, China
- Academy for Engineering and Technology, Yiwu Research Institute of Fudan University, Fudan University, Shanghai 200433, China
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2
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Zhao C, Yan W, Zhang W, Liu D. Coherent Phonon Manipulation via Electron-Phonon Interaction for Facilitated Relaxation of Metastable Centers in ZnO. Nano Lett 2023; 23:8995-9002. [PMID: 37733386 DOI: 10.1021/acs.nanolett.3c02536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/22/2023]
Abstract
Methods that allow versatile manipulation of metastable centers in semiconductors are highly important owing to their potential for quantum information processing and computations. In this study, we demonstrate that the electron-phonon interaction enables phonon participation to promote relaxation of metastable centers in ZnO, which is known for its persistent photoconductivity (PPC) effect. Experimentally, we show that continuous infrared (IR) radiation (1064 nm, ∼30 mW/cm2) promotes longitudinal optical phonons via the Fröhlich interaction and increases the PPC relaxation rate by ∼4 folds. More importantly, we discover that coherent phonons activated by an ultrashort pulse IR laser of the same power increased the relaxation rate by ∼1200-fold, as confirmed by ultrafast transient spectroscopy to be correlated to the excitation of coherent acoustic phonons via the inverse piezoelectric effect. We expect this study to provide valuable guidance for the development of novel quantum and photoactive devices.
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Affiliation(s)
- Chaopeng Zhao
- Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, P. R. China
| | - Weishan Yan
- Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, P. R. China
| | - Wangyang Zhang
- Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, P. R. China
| | - Duo Liu
- Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, P. R. China
- Jinan Institute of Quantum Technology, Jinan, Shandong 250101, P. R. China
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3
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Sun T, Zhou C, Guo H, Meng Z, Liu X, Wang Z, Zhou H, Fei Y, Qiu K, Zhang F, Li B, Zhu X, Yang F, Zhao J, Guo J, Zhao J, Sheng Z. Coherent Phonon-Induced Gigahertz Optical Birefringence and Its Manipulation in SrTiO 3. Adv Sci (Weinh) 2023; 10:e2205707. [PMID: 36646514 PMCID: PMC9982545 DOI: 10.1002/advs.202205707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/01/2022] [Revised: 11/30/2022] [Indexed: 06/17/2023]
Abstract
Birefringence, which modulates the polarization of electromagnetic wave, has been commercially developed and widely used in modern photonics. Fostered by high-frequency signal processing and communications, feasible birefringence technologies operating in gigahertz (GHz) range are highly desired. Here, a coherent phonon-induced GHz optical birefringence and its manipulation in SrTiO3 (STO) crystals are demonsrated. With ultrafast laser pumping, the coherent acoustic phonons with low damping are created in the transducer/STO structures. A series of transducer layers are examined and the optimized one with relatively high photon-phonon conversion efficiency, i.e., semiconducting LaRhO3 film, is obtained. The most intriguing finding here is that, by virtue of high sensitivity to strain perturbation of STO, GHz optical birefringence can be induced by the coherent acoustic phonons and the birefringent amplitudes possess crystal orientation dependence. Optical manipulation of both coherent phonons and its induced GHz birefringence by double pump technique are also realized. These findings reveal an alternative mechanism of ultrafast optical birefringence control, and offer prospects for applications in high-frequency acoustic-optics devices.
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Affiliation(s)
- Tao Sun
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
- University of Science and Technology of ChinaHefei230026P. R. China
- Present address:
Institute of Plasma PhysicsHFIPSChinese Academy of SciencesHefei230031P. R. China
| | - Chun Zhou
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
- Present address:
Institute of Plasma PhysicsHFIPSChinese Academy of SciencesHefei230031P. R. China
| | - Hongli Guo
- ICQD/Hefei National Laboratory for Physical Sciences at Microscaleand CAS Key Laboratory of Strongly‐Coupled Quantum Matter Physicsand Department of PhysicsUniversity of Science and Technology of ChinaHefei230026P. R. China
| | - Zhi Meng
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
| | - Xinyu Liu
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
| | - Zhou Wang
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
- University of Science and Technology of ChinaHefei230026P. R. China
| | - Han Zhou
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
- University of Science and Technology of ChinaHefei230026P. R. China
| | - Yuming Fei
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
- University of Science and Technology of ChinaHefei230026P. R. China
| | - Kang Qiu
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
| | - Fapei Zhang
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
| | - Bolin Li
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
| | - Xuetao Zhu
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190P. R. China
| | - Fang Yang
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190P. R. China
| | - Jimin Zhao
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190P. R. China
| | - Jiandong Guo
- Beijing National Laboratory for Condensed Matter PhysicsInstitute of PhysicsChinese Academy of SciencesBeijing100190P. R. China
| | - Jin Zhao
- ICQD/Hefei National Laboratory for Physical Sciences at Microscaleand CAS Key Laboratory of Strongly‐Coupled Quantum Matter Physicsand Department of PhysicsUniversity of Science and Technology of ChinaHefei230026P. R. China
| | - Zhigao Sheng
- Anhui Key Laboratory of Condensed Matter Physics at Extreme ConditionsHigh Magnetic Field LaboratoryHFIPSAnhui, Chinese Academy of SciencesHefei230031P. R. China
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Li X, Wang A, Chen H, Tao W, Chen Z, Zhang C, Li Y, Zhang Y, Shang H, Weng YX, Zhao J, Zhu H. Ultrafast Spontaneous Localization of a Jahn-Teller Exciton Polaron in Two-Dimensional Semiconducting CrI 3 by Symmetry Breaking. Nano Lett 2022; 22:8755-8762. [PMID: 36305523 DOI: 10.1021/acs.nanolett.2c03689] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
The excited state species and properties in low-dimensional semiconductors can be completely redefined by electron-lattice coupling or a polaronic effect. Here, by combining ultrafast broadband pump-probe spectroscopy and first-principles GW and Bethe-Salpeter equation calculations, we show semiconducting CrI3 as a prototypical 2D polaronic system with characteristic Jahn-Teller exciton polaron induced by symmetry breaking. A photogenerated electron and hole in CrI3 localize spontaneously in ∼0.9 ps and pair geminately to a Jahn-Teller exciton polaron with elongated Cr-I octahedra, large binding energy, and an unprecedentedly small exciton-exciton annihilation rate constant (∼10-20 cm3 s-1). Coherent phonon dynamics indicates the localization is mainly triggered by the coherent nuclear vibration of the I-Cr-I out-of-plane stretch mode at 128.5 ± 0.1 cm-1. The excited state Jahn-Teller exciton polaron in CrI3 broadens the realm of 2D polaron systems and reveals the decisive role of coupled electron-lattice motion on excited state properties and exciton physics in 2D semiconductors.
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Affiliation(s)
- Xufeng Li
- State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited-State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang310027, China
| | - Aolei Wang
- Department of Physics, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and ICQD/Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui230026, China
| | - Hailong Chen
- Beijing National Laboratory for Condensed Matter Physics, The Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing100190, China
| | - Weijian Tao
- State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited-State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang310027, China
| | - Zeng Chen
- State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited-State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang310027, China
| | - Chi Zhang
- State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited-State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang310027, China
| | - Yujie Li
- State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited-State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang310027, China
| | - Yiran Zhang
- State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited-State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang310027, China
| | - Honghui Shang
- Department of Physics, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and ICQD/Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui230026, China
| | - Yu-Xiang Weng
- Beijing National Laboratory for Condensed Matter Physics, The Laboratory of Soft Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing100190, China
| | - Jin Zhao
- Department of Physics, CAS Key Laboratory of Strongly-Coupled Quantum Matter Physics, and ICQD/Hefei National Laboratory for Physical Sciences at Microscale, University of Science and Technology of China, Hefei, Anhui230026, China
| | - Haiming Zhu
- State Key Laboratory of Modern Optical Instrumentation, Key Laboratory of Excited-State Materials of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang310027, China
- ZJU-Hangzhou Global Scientific and Technological Innovation Center, Hangzhou, Zhejiang311200, China
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5
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Afalla J, Prieto EA, Husay HA, Gonzales KC, Catindig G, Abulikemu A, Somintac A, Salvador A, Estacio E, Tani M, Hase M. Effect of heteroepitaxial growth on LT-GaAs: ultrafast optical properties. J Phys Condens Matter 2021; 33:315704. [PMID: 34034248 DOI: 10.1088/1361-648x/ac04cc] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Accepted: 05/25/2021] [Indexed: 06/12/2023]
Abstract
Epitaxial low temperature grown GaAs (LT-GaAs) on silicon (LT-GaAs/Si) has the potential for terahertz (THz) photoconductive antenna applications. However, crystalline, optical and electrical properties of heteroepitaxial grown LT-GaAs/Si can be very different from those grown on semi-insulating GaAs substrates ('reference'). In this study, we investigate optical properties of an epitaxial grown LT-GaAs/Si sample, compared to a reference grown under the same substrate temperature, and with the same layer thickness. Anti-phase domains and some crystal misorientation are present in the LT-GaAs/Si. From coherent phonon spectroscopy, the intrinsic carrier densities are estimated to be 1015 cm-3for either sample. Strong plasmon damping is also observed. Carrier dynamics, measured by time-resolved THz spectroscopy at high excitation fluence, reveals markedly different responses between samples. Below saturation, both samples exhibit the desired fast response. Under optical fluences ⩾54μJ cm-2, the reference LT-GaAs layer shows saturation of electron trapping states leading to non-exponential behavior, but the LT-GaAs/Si maintains a double exponential decay. The difference is attributed to the formation of As-As and Ga-Ga bonds during the heteroepitaxial growth of LT-GaAs/Si, effectively leading to a much lower density of As-related electron traps.
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Affiliation(s)
- Jessica Afalla
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
| | - Elizabeth Ann Prieto
- National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
- MSEP - College of Science, University of the Philippines Diliman, Quezon City, Philippines
| | - Horace Andrew Husay
- National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
| | - Karl Cedric Gonzales
- National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
- Institute of Advanced Materials, Universitat Jaume I, Castelló, Spain
| | - Gerald Catindig
- National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
| | | | - Armando Somintac
- National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
- MSEP - College of Science, University of the Philippines Diliman, Quezon City, Philippines
| | - Arnel Salvador
- National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
- MSEP - College of Science, University of the Philippines Diliman, Quezon City, Philippines
| | - Elmer Estacio
- National Institute of Physics, University of the Philippines Diliman, Quezon City, Philippines
- MSEP - College of Science, University of the Philippines Diliman, Quezon City, Philippines
| | - Masahiko Tani
- Research Center for Development of Far Infrared Region, University of Fukui, Fukui, Japan
| | - Muneaki Hase
- Faculty of Pure and Applied Sciences, University of Tsukuba, Tsukuba, Japan
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6
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Quan LN, Park Y, Guo P, Gao M, Jin J, Huang J, Copper JK, Schwartzberg A, Schaller R, Limmer DT, Yang P. Vibrational relaxation dynamics in layered perovskite quantum wells. Proc Natl Acad Sci U S A 2021; 118:e2104425118. [PMID: 34131083 DOI: 10.1073/pnas.2104425118] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Organic-inorganic layered perovskites, or Ruddlesden-Popper perovskites, are two-dimensional quantum wells with layers of lead-halide octahedra stacked between organic ligand barriers. The combination of their dielectric confinement and ionic sublattice results in excitonic excitations with substantial binding energies that are strongly coupled to the surrounding soft, polar lattice. However, the ligand environment in layered perovskites can significantly alter their optical properties due to the complex dynamic disorder of the soft perovskite lattice. Here, we infer dynamic disorder through phonon dephasing lifetimes initiated by resonant impulsive stimulated Raman photoexcitation followed by transient absorption probing for a variety of ligand substitutions. We demonstrate that vibrational relaxation in layered perovskite formed from flexible alkyl-amines as organic barriers is fast and relatively independent of the lattice temperature. Relaxation in layered perovskites spaced by aromatic amines is slower, although still fast relative to bulk inorganic lead bromide lattices, with a rate that is temperature dependent. Using molecular dynamics simulations, we explain the fast rates of relaxation by quantifying the large anharmonic coupling of the optical modes with the ligand layers and rationalize the temperature independence due to their amorphous packing. This work provides a molecular and time-domain depiction of the relaxation of nascent optical excitations and opens opportunities to understand how they couple to the complex layered perovskite lattice, elucidating design principles for optoelectronic devices.
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Vialla F, Del Fatti N. Time-Domain Investigations of Coherent Phonons in van der Waals Thin Films. Nanomaterials (Basel) 2020; 10:E2543. [PMID: 33348750 PMCID: PMC7766349 DOI: 10.3390/nano10122543] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 12/11/2020] [Accepted: 12/14/2020] [Indexed: 01/31/2023]
Abstract
Coherent phonons can be launched in materials upon localized pulsed optical excitation, and be subsequently followed in time-domain, with a sub-picosecond resolution, using a time-delayed pulsed probe. This technique yields characterization of mechanical, optical, and electronic properties at the nanoscale, and is taken advantage of for investigations in material science, physics, chemistry, and biology. Here we review the use of this experimental method applied to the emerging field of homo- and heterostructures of van der Waals materials. Their unique structure corresponding to non-covalently stacked atomically thin layers allows for the study of original structural configurations, down to one-atom-thin films free of interface defect. The generation and relaxation of coherent optical phonons, as well as propagative and resonant breathing acoustic phonons, are comprehensively discussed. This approach opens new avenues for the in situ characterization of these novel materials, the observation and modulation of exotic phenomena, and advances in the field of acoustics microscopy.
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Affiliation(s)
- Fabien Vialla
- Institut Lumière Matière UMR 5306, Université Claude Bernard Lyon 1, CNRS, Université de Lyon, F-69622 Villeurbanne, France;
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8
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Heinz S, Angel EC, Trapp M, Kleebe HJ, Jakob G. Phonon Bridge Effect in Superlattices of Thermoelectric TiNiSn/HfNiSn With Controlled Interface Intermixing. Nanomaterials (Basel) 2020; 10:E1239. [PMID: 32630581 DOI: 10.3390/nano10061239] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 06/21/2020] [Accepted: 06/22/2020] [Indexed: 11/17/2022]
Abstract
The implementation of thermal barriers in thermoelectric materials improves their power conversion rates effectively. For this purpose, material boundaries are utilized and manipulated to affect phonon transmissivity. Specifically, interface intermixing and topography represents a useful but complex parameter for thermal transport modification. This study investigates epitaxial thin film multilayers, so called superlattices (SL), of TiNiSn/HfNiSn, both with pristine and purposefully deteriorated interfaces. High-resolution transmission electron microscopy and X-ray diffractometry are used to characterize their structural properties in detail. A differential 3ω-method probes their thermal resistivity. The thermal resistivity reaches a maximum for an intermediate interface quality and decreases again for higher boundary layer intermixing. For boundaries with the lowest interface quality, the interface thermal resistance is reduced by 23% compared to a pristine SL. While an uptake of diffuse scattering likely explains the initial deterioration of thermal transport, we propose a phonon bridge interpretation for the lowered thermal resistivity of the interfaces beyond a critical intermixing. In this picture, the locally reduced acoustic contrast of the less defined boundary acts as a mediator that promotes phonon transition.
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Abstract
Black phosphorus is a layered semiconducting material, demonstrating strong layer-dependent optical and electronic properties. Probing the photophysical properties on ultrafast time scales is of central importance in understanding many-body interactions and nonequilibrium quasiparticle dynamics. Here, we applied temporally, spectrally, and spatially resolved pump-probe microscopy to study the transient optical responses of mechanically exfoliated few-layer black phosphorus, with layer numbers ranging from 2 to 9. We have observed layer-dependent resonant transient absorption spectra with both photobleaching and red-shifted photoinduced absorption features, which could be attributed to band gap renormalization of higher subband transitions. Surprisingly, coherent phonon oscillations with unprecedented intensities were observed when the probe photons were in resonance with the optical transitions, which correspond to the low-frequency layer-breathing mode. Our results reveal strong Coulomb interactions and electron-phonon couplings in photoexcited black phosphorus, providing important insights into the ultrafast optical, nanomechanical, and optoelectronic properties of this novel two-dimensional material.
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Affiliation(s)
- Xianchong Miao
- State Key Laboratory of Surface Physics and Department of Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) , Fudan University , Shanghai 200433 , China
- Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093 , China
| | - Guowei Zhang
- State Key Laboratory of Surface Physics and Department of Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) , Fudan University , Shanghai 200433 , China
- Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093 , China
| | - Fanjie Wang
- State Key Laboratory of Surface Physics and Department of Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) , Fudan University , Shanghai 200433 , China
- Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093 , China
| | - Hugen Yan
- State Key Laboratory of Surface Physics and Department of Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) , Fudan University , Shanghai 200433 , China
- Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093 , China
| | - Minbiao Ji
- State Key Laboratory of Surface Physics and Department of Physics, Key Laboratory of Micro and Nano Photonic Structures (Ministry of Education) , Fudan University , Shanghai 200433 , China
- Collaborative Innovation Center of Advanced Microstructures , Nanjing 210093 , China
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10
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Yi C, Dongare PD, Su MN, Wang W, Chakraborty D, Wen F, Chang WS, Sader JE, Nordlander P, Halas NJ, Link S. Vibrational coupling in plasmonic molecules. Proc Natl Acad Sci U S A 2017; 114:11621-6. [PMID: 29078373 DOI: 10.1073/pnas.1712418114] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
Plasmon hybridization theory, inspired by molecular orbital theory, has been extremely successful in describing the near-field coupling in clusters of plasmonic nanoparticles, also known as plasmonic molecules. However, the vibrational modes of plasmonic molecules have been virtually unexplored. By designing precisely configured plasmonic molecules of varying complexity and probing them at the individual plasmonic molecule level, intramolecular coupling of acoustic modes, mediated by the underlying substrate, is observed. The strength of this coupling can be manipulated through the configuration of the plasmonic molecules. Surprisingly, classical continuum elastic theory fails to account for the experimental trends, which are well described by a simple coupled oscillator picture that assumes the vibrational coupling is mediated by coherent phonons with low energies. These findings provide a route to the systematic optical control of the gigahertz response of metallic nanostructures, opening the door to new optomechanical device strategies.
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11
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Nie Z, Long R, Li J, Zheng YY, Prezhdo OV, Loh ZH. Selective Excitation of Atomic-Scale Dynamics by Coherent Exciton Motion in the Non-Born-Oppenheimer Regime. J Phys Chem Lett 2013; 4:4260-4266. [PMID: 26296176 DOI: 10.1021/jz401945m] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Time-domain investigations of the nonadiabatic coupling between electronic and vibrational degrees of freedom have focused primarily on the formation of electronic superpositions induced by atomic motion. The effect of electronic nonstationary-state dynamics on atomic motion remains unexplored. Here, phase-coherent excitation of the two lowest electronic transitions in semiconducting single-walled carbon nanotubes by broadband <5-fs pulses directly triggers coherent exciton motion along the axis of the nanotubes. Optical pump-probe spectroscopy with sub-10-fs time resolution reveals that exciton motion selectively excites the high-frequency G mode coherent phonon, in good agreement with results obtained from time-domain ab initio simulations. This observed phenomenon arises from the direct modulation of the C-C interatomic potential by coherent exciton motion on a time scale that is commensurate with atomic motion. Our results suggest the possibility of employing light-field manipulation of electron densities in the non-Born-Oppenheimer regime to initiate selective atomic motion.
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Affiliation(s)
- Zhaogang Nie
- †Division of Chemistry and Biological Chemistry, and Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 631371, Singapore
| | - Run Long
- ‡Department of Chemistry, University of Rochester, RC Box 270216, Rochester, New York 14627, United States
- §School of Physics, Complex Adaptive Systems Laboratory, University College Dublin, Belfield, Dublin 4, Ireland
| | - Jialin Li
- †Division of Chemistry and Biological Chemistry, and Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 631371, Singapore
| | - Yi Ying Zheng
- †Division of Chemistry and Biological Chemistry, and Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 631371, Singapore
| | - Oleg V Prezhdo
- ‡Department of Chemistry, University of Rochester, RC Box 270216, Rochester, New York 14627, United States
| | - Zhi-Heng Loh
- †Division of Chemistry and Biological Chemistry, and Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore 631371, Singapore
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12
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Hu J, Misochko OV, Takahashi H, Koguchi H, Eda T, Nakamura KG. Ultrafast zone-center coherent lattice dynamics in ferroelectric lithium tantalate. Sci Technol Adv Mater 2011; 12:034409. [PMID: 27877400 PMCID: PMC5090472 DOI: 10.1088/1468-6996/12/3/034409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2011] [Revised: 06/16/2011] [Accepted: 05/08/2011] [Indexed: 06/06/2023]
Abstract
Femtosecond time-resolved pump-probe experiments were carried out to study ultrafast lattice dynamics of ferroelectric lithium tantalate. Both the fully symmetric (A1 mode) and doubly degenerate (E mode) coherent phonons at the center of the Brillouin zone were excited via impulsive stimulated Raman scattering, as confirmed by the excitation intensity dependence.
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Affiliation(s)
- Jianbo Hu
- Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
- Institute of Fluid Physics, Chinese Academy of Engineering Physics, PO Box 919-102, Mianyang, Sichuan 621900, Peoples Republic of China
| | - Oleg V Misochko
- Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Moscow region, Russia
| | - Hiroshi Takahashi
- Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Hiroaki Koguchi
- Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Takayuki Eda
- Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
| | - Kazutaka G Nakamura
- Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, 4259 Nagatsuta, Yokohama 226-8503, Japan
- CREST, Japan Science and Technology Agency, Kawaguchi, Saitama 332-0012, Japan
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