Quantum Composites with Charge‐Density‐Wave Fillers

Barani, Zahra; Tekwam, Geremew,; Stokey, Megan; Sesing, Nicholas R.; Taheri, Maedeh; Hilfiker, Matthew; Kargar, Fariborz; Schubert, M.; Salguero, Tina T.; Balandin, Alexander A.

doi:10.1002/adma.202209708

Cited by 3 publications

(2 citation statements)

References 80 publications

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“…Not only an ever-increasing number of CDW materials have been prepared but also many challenging properties have emerged. For instance, topologically non-trivial CDW systems, broad-band and narrow-band electronic noise in CDW materials, optical and electrical switching of CDW phases, multiple CDW systems, control of the CDW instability by stress, photoinduced CDW melting and possible associated photo-caloric effects just to name a few have been recently reported [409][410][411][412][413][414][415][416][417][418][419][420]. Many of these properties have paved the way for practical applications.…”

Section: Discussionmentioning

confidence: 99%

Structural approach to charge density waves in low-dimensional systems: electronic instability and chemical bonding

Pouget,

Canadell

2024

Rep. Prog. Phys.

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Abstract. The charge density wave (CDW) instability, usually occurring in low-dimensional materials, has been a topic of interest for longtime. However, some very fundamental aspects of the mechanism remain unclear. Recently, a plethora of new CDW materials, a substantial fraction of which is 2D (two-dimensional) or even 3D (three-dimensional), has been prepared and characterized as bulk and/or single-layers. As a result, the need for revisiting the primary mechanism of the instability, based on the electron-hole instability established more than 50 years ago for quasi-1D (quasi-one-dimensional) conductors, has clearly emerged. In this work, we consider a large number of CDW materials to revisit the main concepts used in understanding the CDW instability, and emphasize the key role of the momentum dependent electron-phonon coupling in linking electronic and structural degrees of freedom. We argue that for quasi-1D systems, earlier weak coupling theories work appropriately and the energy gain due to the CDW and the concomitant periodic lattice distortion (PLD) remains primarily due to a Fermi surface nesting mechanism. However, for materials with higher dimensionality, intermediate and strong coupling regimes are generally at work and the modification of the chemical bonding network by the PLD is at the heart of the instability. We emphasize the need for a microscopic approach blending condensed matter physics concepts and state-of-the-art first-principles calculations with quite fundamental chemical bonding ideas in understanding the CDW phenomenon in these materials.

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Section: Discussionmentioning

confidence: 99%

Structural approach to charge density waves in low-dimensional systems: electronic instability and chemical bonding

Pouget,

Canadell

2024

Rep. Prog. Phys.

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“…15 The additional difficulties with the interpretation of Raman spectrum features in van der Waals materials, typically synthesized via the vapor transport methods, are associated with possible deviations from the stoichiometry, unintentional doping, and defects that may affect the Raman selection rules. 36,37 In this paper, we report the results of the combined experimental and computational study of phonon states in quasi-1D NbTe 4 and TaTe 4 materials and discuss possible physical mechanisms behind the drastic difference in the intensity of the Raman spectra.…”

Section: Introductionmentioning

confidence: 99%

Raman spectroscopy of phonon states in NbTe₄ and TaTe₄ quasi‐one‐dimensional van der Waals crystals

Nataj,

Kargar,

Krylyuk

et al. 2024

J Raman Spectroscopy

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We report the results of polarization‐dependent Raman spectroscopy of phonon states in single‐crystalline quasi‐one‐dimensional NbTe4 and TaTe4 van der Waals materials. The measurements were conducted in the wide temperature range from 80 to 560 K. Our results show that although both materials have identical crystal structures and symmetries, there is a drastic difference in the intensity of their Raman spectra. While TaTe4 exhibits well‐defined peaks through the examined wavenumber and temperature ranges, NbTe4 reveals extremely weak Raman signatures. The measured spectral positions of the phonon peaks agree with the phonon band structure calculated using the density‐functional theory. We offer possible reasons for the intensity differences between the two van der Waals materials. Our results provide insights into the phonon properties of NbTe4 and TaTe4 van der Waals materials and indicate the potential of Raman spectroscopy for studying charge‐density‐wave quantum condensate phases.

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The noise of the charge density waves in quasi-1D NbSe3 nanowires — contributions of electrons and quantum condensate

Ghosh,

Rumyantsev,

Balandin

2024

Applied Physics Reviews

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Low-frequency electronic noise in charge-density-wave van der Waals materials has been an important characteristic, providing information about the material quality, phase transitions, and collective current transport. However, the noise sources and mechanisms have not been completely understood, particularly for the materials with a non-fully gapped Fermi surface where the electrical current includes components from individual electrons and the sliding charge-density wave. We investigated noise in nanowires of quasi-one-dimensional NbSe3, focusing on a temperature range near the Pearls transition TP1 ∼ 145 K. The data analysis allowed us to separate the noise produced by the individual conduction electrons and the quantum condensate of the charge density waves before and after the onset of sliding. The noise as a function of temperature and electric bias reveals several intriguing peaks. We explained the observed features by the depinning threshold field, the creep and sliding of the charge density waves, and the possible existence of the hidden phases. It was found that the charge density wave condensate is particularly noisy at the moment of depinning. The noise of the collective current reduces with the increasing bias voltage in contrast to the noise of the individual electrons. Our results shed light on the behavior of the charge density wave quantum condensate and demonstrate the potential of noise spectroscopy for investigating the properties of low-dimensional quantum materials.

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Quantum Composites with Charge‐Density‐Wave Fillers

Cited by 3 publications

References 80 publications

Structural approach to charge density waves in low-dimensional systems: electronic instability and chemical bonding

Structural approach to charge density waves in low-dimensional systems: electronic instability and chemical bonding

Raman spectroscopy of phonon states in NbTe₄ and TaTe₄ quasi‐one‐dimensional van der Waals crystals

The noise of the charge density waves in quasi-1D NbSe3 nanowires — contributions of electrons and quantum condensate

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Quantum Composites with Charge‐Density‐Wave Fillers

Cited by 3 publications

References 80 publications

Structural approach to charge density waves in low-dimensional systems: electronic instability and chemical bonding

Structural approach to charge density waves in low-dimensional systems: electronic instability and chemical bonding

Raman spectroscopy of phonon states in NbTe4 and TaTe4 quasi‐one‐dimensional van der Waals crystals

The noise of the charge density waves in quasi-1D NbSe3 nanowires — contributions of electrons and quantum condensate

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Raman spectroscopy of phonon states in NbTe₄ and TaTe₄ quasi‐one‐dimensional van der Waals crystals