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Yang LX, Rohde G, Hanff K, Stange A, Xiong R, Shi J, Bauer M, Rossnagel K. Bypassing the Structural Bottleneck in the Ultrafast Melting of Electronic Order. PHYSICAL REVIEW LETTERS 2020; 125:266402. [PMID: 33449703 DOI: 10.1103/physrevlett.125.266402] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/29/2020] [Accepted: 11/23/2020] [Indexed: 06/12/2023]
Abstract
Impulsive optical excitation generally results in a complex nonequilibrium electron and lattice dynamics that involves multiple processes on distinct timescales, and a common conception is that for times shorter than about 100 fs the gap in the electronic spectrum is not seriously affected by lattice vibrations. Here, however, by directly monitoring the photoinduced collapse of the spectral gap in a canonical charge-density-wave material, the blue bronze Rb_{0.3}MoO_{3}, we find that ultrafast (∼60 fs) vibrational disordering due to efficient hot-electron energy dissipation quenches the gap significantly faster than the typical structural bottleneck time corresponding to one half-cycle oscillation (∼315 fs) of the coherent charge-density-wave amplitude mode. This result not only demonstrates the importance of incoherent lattice motion in the photoinduced quenching of electronic order, but also resolves the perennial debate about the nature of the spectral gap in a coupled electron-lattice system.
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Affiliation(s)
- L X Yang
- State Key Laboratory of Low Dimensional Quantum Physics, Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
- Frontier Science Center for Quantum Information, Beijing 100084, People's Republic of China
| | - G Rohde
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - K Hanff
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - A Stange
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - R Xiong
- Department of Physics, Wuhan University, Wuhan 430072, People's Republic of China
| | - J Shi
- Department of Physics, Wuhan University, Wuhan 430072, People's Republic of China
| | - M Bauer
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
| | - K Rossnagel
- Institut für Experimentelle und Angewandte Physik, Christian-Albrechts-Universität zu Kiel, 24098 Kiel, Germany
- Ruprecht-Haensel-Labor, Deutsches Elektronen-Synchrotron DESY, 22607 Hamburg, Germany
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Kupčić I, Rukelj Z, Barišić S. CDW fluctuations and the pseudogap in the single-particle conductivity of quasi-1D Peierls CDW systems: II. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2014; 26:195601. [PMID: 24762557 DOI: 10.1088/0953-8984/26/19/195601] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The current-dipole Kubo formula for the dynamical conductivity of interacting multiband electronic systems derived in Kupčić et al (2013 J. Phys.: Condens. Matter 25 145602) is illustrated on the Peierls model for quasi-one-dimensional systems with the charge-density-wave (CDW) instability. Using the microscopic representation of the Peierls model, it is shown in which way the scattering of conduction electrons by CDW fluctuations affects the dynamical conductivity at temperatures above and well below the CDW transition temperature. The generalized Drude formula for the intraband conductivity is derived in the ordered CDW state well below the transition temperature. The natural extension of this formula to the case where the intraband memory function is dependent on frequency and wave vectors is also presented. It is shown that the main adventage of such a memory-function conductivity model is that it can be easily extended to study the dynamical conductivity and the electronic Raman scattering in more complicated multiband electronic systems in a way consistent with the law of conservation of energy. The incoherent interband conductivity in the CDW pseudogap state is briefly discussed as well.
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Affiliation(s)
- I Kupčić
- Department of Physics, Faculty of Science, University of Zagreb, PO Box 331, HR-10002 Zagreb, Croatia
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Doná E, Loerting T, Penner S, Minca M, Menzel A, Bertel E, Schoiswohl J, Berkebile S, Netzer FP, Zucca R, Redinger J. Fluctuations and phase separation in a quasi-one-dimensional system. PHYSICAL REVIEW LETTERS 2007; 98:186101. [PMID: 17501588 DOI: 10.1103/physrevlett.98.186101] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/22/2006] [Indexed: 05/15/2023]
Abstract
Phase transitions in a quasi-one-dimensional surface system on a metal substrate are investigated as a function of temperature. Upon cooling the system shows a loss of long-range order, fluctuations, and a transition into an inhomogeneous ground state due to competition of local adsorbate-adsorbate interactions with an incommensurate charge density wave. This agrees with a general phase diagram for correlated systems and high-temperature superconductors. The model surface system allows direct imaging of the fluctuations and the glassy inhomogeneous ground state by scanning tunneling microscopy.
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Affiliation(s)
- Enrico Doná
- Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
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Perfetti L, Berger H, Reginelli A, Degiorgi L, Höchst H, Voit J, Margaritondo G, Grioni M. Spectroscopic indications of polaronic carriers in the quasi-one-dimensional conductor (TaSe4)2I. PHYSICAL REVIEW LETTERS 2001; 87:216404. [PMID: 11736358 DOI: 10.1103/physrevlett.87.216404] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2001] [Indexed: 05/23/2023]
Abstract
Angle-resolved photoemission (ARPES) on the quasi-one-dimensional conductor (TaSe4)2I shows a hidden Fermi-surface crossing in its metallic state and the opening of a Peierls gap at low temperatures. The underlying quasiparticles have vanishing spectral weight and extremely short coherence lengths. They are interpreted as polarons in the strong-coupling adiabatic limit, and almost all their ARPES weight is incoherent. These observations suggest a scenario where the long-standing contradictions between ARPES and other experiments on Peierls materials could be resolved.
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Affiliation(s)
- L Perfetti
- Institut de Physique Appliquée, Ecole Polytechnique Fédérale (EPFL), CH-1015 Lausanne, Switzerland
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Monien H. Exact results for the crossover from Gaussian to non-Gaussian order parameter fluctuations in quasi-one-dimensional electronic systems. PHYSICAL REVIEW LETTERS 2001; 87:126402. [PMID: 11580532 DOI: 10.1103/physrevlett.87.126402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/23/2001] [Indexed: 05/23/2023]
Abstract
The physics of quasi-one-dimensional Peierls systems is dominated by order parameter fluctuations. We present an algorithm which allows us for the first time to exactly calculate physical properties of the electrons gas coupled to classical order parameter fluctuations. The whole range from the Gaussian regime dominated by amplitude fluctuations to the non-Gaussian regime dominated by phase fluctuations is accessible. Our results provide insight into the "pseudogap" phenomenon occurring in underdoped high- T(c) superconductors, quasi-one-dimensional organic conductors, and liquid metals.
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Affiliation(s)
- H Monien
- Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502, Japan
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McKenzie RH, Scarratt D. Non-Fermi-liquid behavior due to short-range order. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R12709-R12712. [PMID: 9985225 DOI: 10.1103/physrevb.54.r12709] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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McKenzie RH, Athas GJ, Brooks JS, Clark RG, Dzurak AS, Newbury R, Starrett RP, Skougarevsky A, Tokumoto M, Kinoshita N, Kinoshita T, Tanaka Y. Magnetoresistance and magnetic breakdown in the quasi-two-dimensional conductors (BEDT-TTF)2MHg(SCN)4. PHYSICAL REVIEW. B, CONDENSED MATTER 1996; 54:R8289-R8292. [PMID: 9984577 DOI: 10.1103/physrevb.54.r8289] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
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