1
|
Matson JR, Alam MN, Varnavides G, Sohr P, Knight S, Darakchieva V, Stokey M, Schubert M, Said A, Beechem T, Narang P, Law S, Caldwell JD. The Role of Optical Phonon Confinement in the Infrared Dielectric Response of III-V Superlattices. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2305106. [PMID: 38039437 DOI: 10.1002/adma.202305106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 07/16/2023] [Indexed: 12/03/2023]
Abstract
Polar dielectrics are key materials of interest for infrared (IR) nanophotonic applications due to their ability to host phonon-polaritons that allow for low-loss, subdiffractional control of light. The properties of phonon-polaritons are limited by the characteristics of optical phonons, which are nominally fixed for most "bulk" materials. Superlattices composed of alternating atomically thin materials offer control over crystal anisotropy through changes in composition, optical phonon confinement, and the emergence of new modes. In particular, the modified optical phonons in superlattices offer the potential for so-called crystalline hybrids whose IR properties cannot be described as a simple mixture of the bulk constituents. To date, however, studies have primarily focused on identifying the presence of new or modified optical phonon modes rather than assessing their impact on the IR response. This study focuses on assessing the impact of confined optical phonon modes on the hybrid IR dielectric function in superlattices of GaSb and AlSb. Using a combination of first principles theory, Raman, FTIR, and spectroscopic ellipsometry, the hybrid dielectric function is found to track the confinement of optical phonons, leading to optical phonon spectral shifts of up to 20 cm-1 . These results provide an alternative pathway toward designer IR optical materials.
Collapse
Affiliation(s)
- Joseph R Matson
- Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, TN, 37212, USA
| | - Md Nazmul Alam
- Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA
| | - Georgios Varnavides
- John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA, 02138, USA
| | - Patrick Sohr
- Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA
| | - Sean Knight
- Solid State Physics and NanoLund, Lund University, Lund, 22100, Sweden
- Competence Center for III-Nitride Technology, C3NiT - Janzèn, Linköping University, Linköping, 58183, Sweden
- Terahertz Materials Analysis Center (THeMAC), Linköping University, Linköping, 58183, Sweden
| | - Vanya Darakchieva
- Solid State Physics and NanoLund, Lund University, Lund, 22100, Sweden
- Competence Center for III-Nitride Technology, C3NiT - Janzèn, Linköping University, Linköping, 58183, Sweden
- Terahertz Materials Analysis Center (THeMAC), Linköping University, Linköping, 58183, Sweden
| | - Megan Stokey
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Mathias Schubert
- Solid State Physics and NanoLund, Lund University, Lund, 22100, Sweden
- Department of Electrical and Computer Engineering, University of Nebraska-Lincoln, Lincoln, NE, 68588, USA
| | - Ayman Said
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, 60439, USA
| | - Thomas Beechem
- School of Mechanical Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, IN, 47907, USA
| | - Prineha Narang
- Physical Sciences Division, College of Letters and Science, University of California, Los Angeles (UCLA), Los Angeles, CA, 90095, USA
| | - Stephanie Law
- Department of Materials Science and Engineering, University of Delaware, Newark, DE, 19716, USA
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA, 16802, USA
| | - Joshua D Caldwell
- Interdisciplinary Materials Science Program, Vanderbilt University, Nashville, TN, 37212, USA
- Department of Mechanical Engineering, Vanderbilt University, Nashville, TN, 37212, USA
| |
Collapse
|
2
|
Shen X, Heid R, Hott R, Haghighirad AA, Salzmann B, Dos Reis Cantarino M, Monney C, Said AH, Frachet M, Murphy B, Rossnagel K, Rosenkranz S, Weber F. Precursor region with full phonon softening above the charge-density-wave phase transition in 2H-TaSe 2. Nat Commun 2023; 14:7282. [PMID: 37949889 PMCID: PMC10638379 DOI: 10.1038/s41467-023-43094-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Accepted: 10/31/2023] [Indexed: 11/12/2023] Open
Abstract
Research on charge-density-wave (CDW) ordered transition-metal dichalcogenides continues to unravel new states of quantum matter correlated to the intertwined lattice and electronic degrees of freedom. Here, we report an inelastic x-ray scattering investigation of the lattice dynamics of the canonical CDW compound 2H-TaSe2 complemented by angle-resolved photoemission spectroscopy and density functional perturbation theory. Our results rule out the formation of a central-peak without full phonon softening for the CDW transition in 2H-TaSe2 and provide evidence for a novel precursor region above the CDW transition temperature TCDW, which is characterized by an overdamped phonon mode and not detectable in our photoemission experiments. Thus, 2H-TaSe2 exhibits structural before electronic static order and emphasizes the important lattice contribution to CDW transitions. Our ab-initio calculations explain the interplay of electron-phonon coupling and Fermi surface topology triggering the CDW phase transition and predict that the CDW soft phonon mode promotes emergent superconductivity near the pressure-driven CDW quantum critical point.
Collapse
Affiliation(s)
- Xingchen Shen
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany
- College of Physics, Chongqing University, Chongqing, 401331, P. R. China
| | - Rolf Heid
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany
| | - Roland Hott
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany
| | - Amir-Abbas Haghighirad
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany
| | - Björn Salzmann
- Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, 1700, Fribourg, Switzerland
| | - Marli Dos Reis Cantarino
- Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, 1700, Fribourg, Switzerland
- Instituto de Física, Universidade de São Paulo, São Paulo, São Paulo, 05508-090, Brazil
| | - Claude Monney
- Département de Physique and Fribourg Center for Nanomaterials, Université de Fribourg, 1700, Fribourg, Switzerland
| | - Ayman H Said
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Mehdi Frachet
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany
| | - Bridget Murphy
- Institute of Experimental and Applied Physics and KiNSIS, Kiel University, 24098, Kiel, Germany
- Ruprecht Haensel Laboratory, Kiel University, 24098, Kiel, Germany
| | - Kai Rossnagel
- Institute of Experimental and Applied Physics and KiNSIS, Kiel University, 24098, Kiel, Germany
- Ruprecht Haensel Laboratory, Kiel University, 24098, Kiel, Germany
- Ruprecht Haensel Laboratory, Deutsches Elektronen-Synchrotron DESY, 22607, Hamburg, Germany
| | - Stephan Rosenkranz
- Materials Science Division, Argonne National Laboratory, Lemont, IL, 60439, USA
| | - Frank Weber
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021, Karlsruhe, Germany.
| |
Collapse
|
3
|
Li S, Qin Z, Wu H, Li M, Kunz M, Alatas A, Kavner A, Hu Y. Anomalous thermal transport under high pressure in boron arsenide. Nature 2022; 612:459-464. [PMID: 36418403 DOI: 10.1038/s41586-022-05381-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2021] [Accepted: 09/22/2022] [Indexed: 11/25/2022]
Abstract
High pressure represents extreme environments and provides opportunities for materials discovery1-8. Thermal transport under high hydrostatic pressure has been investigated for more than 100 years and all measurements of crystals so far have indicated a monotonically increasing lattice thermal conductivity. Here we report in situ thermal transport measurements in the newly discovered semiconductor crystal boron arsenide, and observe an anomalous pressure dependence of the thermal conductivity. We use ultrafast optics, Raman spectroscopy and inelastic X-ray scattering measurements to examine the phonon bandstructure evolution of the optical and acoustic branches, as well as thermal conductivity under varied temperatures and pressures up to 32 gigapascals. Using atomistic theory, we attribute the anomalous high-pressure behaviour to competitive heat conduction channels from interactive high-order anharmonicity physics inherent to the unique phonon bandstructure. Our study verifies ab initio theory calculations and we show that the phonon dynamics-resulting from competing three-phonon and four-phonon scattering processes-are beyond those expected from classical models and seen in common materials. This work uses high-pressure spectroscopy combined with atomistic theory as a powerful approach to probe complex phonon physics and provide fundamental insights for understanding microscopic energy transport in materials of extreme properties.
Collapse
Affiliation(s)
- Suixuan Li
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, USA
| | - Zihao Qin
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, USA
| | - Huan Wu
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, USA
| | - Man Li
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, USA
| | - Martin Kunz
- Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA, USA
| | - Ahmet Alatas
- Advanced Photon Source, Argonne National Laboratory, Argonne, IL, USA
| | - Abby Kavner
- Department of Earth and Space Sciences, University of California, Los Angeles, Los Angeles, CA, USA
| | - Yongjie Hu
- Department of Mechanical and Aerospace Engineering, University of California, Los Angeles, Los Angeles, CA, USA.
| |
Collapse
|
4
|
Yu XJ, Chi X, Smulders T, Wee ATS, Rusydi A, Sanchez del Rio M, Breese MBH. Beamline simulations using monochromators with high d-spacing crystals. JOURNAL OF SYNCHROTRON RADIATION 2022; 29:1157-1166. [PMID: 36073874 PMCID: PMC9455208 DOI: 10.1107/s160057752200707x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/18/2022] [Accepted: 07/10/2022] [Indexed: 06/15/2023]
Abstract
Monochromators for synchrotron radiation beamlines typically use perfect crystals for the hard X-ray regime and gratings for soft X-rays. There is an intermediate range, typically 1-3 keV (tender X-rays), which common perfect crystals have difficulties covering and gratings have low efficiency, although some less common crystals with high d-spacing could be suitable. To evaluate the suitability of these crystals for a particular beamline, it is useful to evaluate the crystals' performance using tools such as ray-tracing. However, simulations for double-crystal monochromators are only available for the most used crystals such as Si, Ge or diamond. Here, an upgrade of the SHADOW ray-tracing code and complementary tools in the OASYS suite are presented to simulate high d-spacing crystals with arbitrary, and sometimes complex, structures such as beryl, YB66, muscovite, etc. Isotropic and anisotropic temperature factors are also considered. The YB66 crystal with 1936 atomic sites in the unit cell is simulated, and its applicability for tender X-ray monochromators is discussed in the context of new low-emittance storage rings.
Collapse
Affiliation(s)
- X. J. Yu
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 117603, Singapore
| | - X. Chi
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 117603, Singapore
- Department of Physics, National University of Singapore, Singapore 117576, Singapore
| | - T. Smulders
- Department of Engineering Physics, Fonty University of Applied Sciences, 5615DB Eindhoven, The Netherlands
| | - A. T. S. Wee
- Department of Physics, National University of Singapore, Singapore 117576, Singapore
- Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117546, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, Singapore 117456, Singapore
| | - A. Rusydi
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 117603, Singapore
- Department of Physics, National University of Singapore, Singapore 117576, Singapore
- Centre for Advanced 2D Materials and Graphene Research Centre, National University of Singapore, Singapore 117546, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, Singapore 117456, Singapore
| | | | - M. B. H. Breese
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore 117603, Singapore
- Department of Physics, National University of Singapore, Singapore 117576, Singapore
| |
Collapse
|
5
|
Altering Terahertz Sound Propagation in a Liquid upon Nanoparticle Immersion. NANOMATERIALS 2022; 12:nano12142401. [PMID: 35889625 PMCID: PMC9318512 DOI: 10.3390/nano12142401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/24/2022] [Revised: 07/11/2022] [Accepted: 07/12/2022] [Indexed: 11/25/2022]
Abstract
One of the grand challenges of new generation Condensed Matter physicists is the development of novel devices enabling the control of sound propagation at terahertz frequency. Indeed, phonon excitations in this frequency window are the leading conveyor of heat transfer in insulators. Their manipulation is thus critical to implementing heat management based on the structural design. To explore the possibility of controlling the damping of sound waves, we used high spectral contrast Inelastic X-ray Scattering (IXS) to comparatively study terahertz acoustic damping in a dilute suspension of 50 nm nanospheres in glycerol and on pure glycerol. Bayesian inference-based modeling of measured spectra indicates that, at sufficiently large distances, the spectral contribution of collective modes in the glycerol suspension becomes barely detectable due to the enhanced damping, the weakening, and the slight softening of the dominant acoustic mode.
Collapse
|
6
|
Ding J, Lanigan-Atkins T, Calderón-Cueva M, Banerjee A, Abernathy DL, Said A, Zevalkink A, Delaire O. Soft anharmonic phonons and ultralow thermal conductivity in Mg 3(Sb, Bi) 2 thermoelectrics. SCIENCE ADVANCES 2021; 7:7/21/eabg1449. [PMID: 34020958 PMCID: PMC8139592 DOI: 10.1126/sciadv.abg1449] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/14/2020] [Accepted: 04/01/2021] [Indexed: 06/12/2023]
Abstract
The candidate thermoelectric compounds Mg3Sb2 and Mg3Bi2 show excellent performance near ambient temperature, enabled by an anomalously low lattice thermal conductivity (κl) comparable to those of much heavier PbTe or Bi2Te3 Contrary to common mass-trend expectations, replacing Mg with heavier Ca or Yb yields a threefold increase in κl in CaMg2Sb2 and YbMg2Bi2 Here, we report a comprehensive analysis of phonons in the series AMg2 X 2 (A = Mg, Ca, and Yb; X = Bi and Sb) based on inelastic neutron/x-ray scattering and first-principles simulations and show that the anomalously low κl of Mg3 X 2 has inherent phononic origins. We uncover a large phonon softening and flattening of low-energy transverse acoustic phonons in Mg3 X 2 compared to the ternary analogs and traced to a specific Mg-X bond, which markedly enlarges the scattering phase-space, enabling the threefold tuning in κl These results provide key insights for manipulating phonon scattering without the traditional reliance on heavy elements.
Collapse
Affiliation(s)
- Jingxuan Ding
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA
| | - Tyson Lanigan-Atkins
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA
| | - Mario Calderón-Cueva
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48910, USA
| | - Arnab Banerjee
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
- Department of Physics and Astronomy, Purdue University, West Lafayette, IN 47906, USA
| | - Douglas L Abernathy
- Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA
| | - Ayman Said
- Advanced Photon Source, Argonne National Laboratory, Lemont, IL 60439, USA
| | - Alexandra Zevalkink
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI 48910, USA
| | - Olivier Delaire
- Department of Mechanical Engineering and Materials Science, Duke University, Durham, NC 27708, USA.
- Department of Chemistry, Duke University, Durham, NC 27708, USA
- Department of Physics, Duke University, Durham, NC 27708, USA
| |
Collapse
|
7
|
Wu S, Song Y, He Y, Frano A, Yi M, Chen X, Uchiyama H, Alatas A, Said AH, Wang L, Wolf T, Meingast C, Birgeneau RJ. Short-Range Nematic Fluctuations in Sr_{1-x}Na_{x}Fe_{2}As_{2} Superconductors. PHYSICAL REVIEW LETTERS 2021; 126:107001. [PMID: 33784111 DOI: 10.1103/physrevlett.126.107001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 02/02/2021] [Indexed: 06/12/2023]
Abstract
Interactions between nematic fluctuations, magnetic order and superconductivity are central to the physics of iron-based superconductors. Here we report on in-plane transverse acoustic phonons in hole-doped Sr_{1-x}Na_{x}Fe_{2}As_{2} measured via inelastic x-ray scattering, and extract both the nematic susceptibility and the nematic correlation length. By a self-contained method of analysis, for the underdoped (x=0.36) sample, which harbors a magnetically ordered tetragonal phase, we find it hosts a short nematic correlation length ξ∼10 Å and a large nematic susceptibility χ_{nem}. The optimal-doped (x=0.55) sample exhibits weaker phonon softening effects, indicative of both reduced ξ and χ_{nem}. Our results suggest short-range nematic fluctuations may favor superconductivity, placing emphasis on the nematic correlation length for understanding the iron-based superconductors.
Collapse
Affiliation(s)
- Shan Wu
- Department of Physics, University of California, Berkeley, California 94720, USA
- Material Sciences Division, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
| | - Yu Song
- Department of Physics, University of California, Berkeley, California 94720, USA
- Material Sciences Division, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
| | - Yu He
- Department of Physics, University of California, Berkeley, California 94720, USA
| | - Alex Frano
- Department of Physics, University of California, San Diego, California 92093, USA
| | - Ming Yi
- Department of Physics and Astronomy, Rice University, Houston, Texas 77005, USA
| | - Xiang Chen
- Department of Physics, University of California, Berkeley, California 94720, USA
- Material Sciences Division, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
| | - Hiroshi Uchiyama
- Japan Synchrotron Radiation Research Institute, SPring-8, 1-1-1 Kouto, Sayo, Hyogo 679-5198, Japan
| | - Ahmet Alatas
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Ayman H Said
- Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA
| | - Liran Wang
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | - Thomas Wolf
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | - Christoph Meingast
- Institute for Quantum Materials and Technologies, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
| | - Robert J Birgeneau
- Department of Physics, University of California, Berkeley, California 94720, USA
- Material Sciences Division, Lawrence Berkeley National Lab, Berkeley, California 94720, USA
| |
Collapse
|
8
|
van der Waals driven anharmonic melting of the 3D charge density wave in VSe 2. Nat Commun 2021; 12:598. [PMID: 33500397 PMCID: PMC7838422 DOI: 10.1038/s41467-020-20829-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2020] [Accepted: 12/22/2020] [Indexed: 11/24/2022] Open
Abstract
Understanding of charge-density wave (CDW) phases is a main challenge in condensed matter due to their presence in high-Tc superconductors or transition metal dichalcogenides (TMDs). Among TMDs, the origin of the CDW in VSe2 remains highly debated. Here, by means of inelastic x-ray scattering and first-principles calculations, we show that the CDW transition is driven by the collapse at 110 K of an acoustic mode at qCDW = (2.25 0 0.7) r.l.u. The softening starts below 225 K and expands over a wide region of the Brillouin zone, identifying the electron-phonon interaction as the driving force of the CDW. This is supported by our calculations that determine a large momentum-dependence of the electron-phonon matrix-elements that peak at the CDW wave vector. Our first-principles anharmonic calculations reproduce the temperature dependence of the soft mode and the TCDW onset only when considering the out-of-plane van der Waals interactions, which reveal crucial for the melting of the CDW phase. The nature of the charge density wave transition in VSe2 is still debated. Here, the authors demonstrate that the transition is mainly driven by electron-phonon interactions, despite the presence of the Fermi-surface nesting, and that Wan-der-Waals forces are responsible for melting of the charge density wave order.
Collapse
|