Perturbation of charge density waves in 
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Mulani, Imrankhan; Rajput, Umashankar; Harnagea, Luminita; Deshpande, Aparna

doi:10.1103/physrevb.103.125430

Cited by 7 publications

(3 citation statements)

References 49 publications

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“…While it is generally considered a prime candidate for an excitonic insulator with finite momentum transfer [4,32,61,[119][120][121], a clear-cut consensus has not been reached since the resultant CDW phase and PLD is hard to discern between the electronically driven excitonic insulator and the conventional CDW. The successful epitaxial growth of ML 1T-TiSe 2 has allowed the control of the dimensionality of this material [122][123][124][125], which inspires new experimental and theoretical investigations on the origin of the CDW transition [126][127][128][129].…”

Section: Tise 2 Tite 2 : the Role Of Substratementioning

confidence: 99%

Charge density waves in two-dimensional transition metal dichalcogenides

Hwang,

Ruan,

Chen

et al. 2024

Rep. Prog. Phys.

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Charge density wave (CDW) is one of the most ubiquitous electronic orders in quantum materials. While the essential ingredients of CDW order have been extensively studied, a comprehensive microscopic understanding is yet to be reached. Recent research eﬀorts on the CDW phenomena in two-dimensional (2D) materials provide a new pathway toward a deeper understanding of its complexity. This review provides an overview of the CDW orders in 2D with atomically thin transition metal dichalcogenides (TMDCs) as the materials platform. We mainly focus on the electronic structure investigations on the epitaxially grown TMDC samples with angle-resolved photoemission spectroscopy and scanning tunneling microscopy/spectroscopy as complementary experimental tools. We discuss the possible origins of the 2D CDW, novel quantum states co-existing with them, and exotic types of charge orders that can only be realized in the 2D limit.

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Section: Tise 2 Tite 2 : the Role Of Substratementioning

confidence: 99%

Charge density waves in two-dimensional transition metal dichalcogenides

Hwang,

Ruan,

Chen

et al. 2024

Rep. Prog. Phys.

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“…[18][19][20] The electronic configuration of a low carrier density semimetallic system with a small overlap can lead to the spontaneous formation of excitonic condensation [21][22][23] below its transition temperature, such as titanium diselenide (TiSe 2 ), 24 owing to the screened attractive Coulomb force. 25 The BEC state in TiSe 2 has been extensively studied by a variety of means, such as examining electronic collective modes through momentum-resolved electron energy-loss spectroscopy (M-EELS), 26 observing flat valence-band dispersion by angle-resolved photoemission spectroscopy (ARPES), 27,28 and investigating the lattice structure using low-temperature scanning tunneling microscopy (STM), 29,30 femtosecond resolution x-ray diffraction (XRD) 31 and a variational Monte Carlo computation. 32 Notably, despite various routes were reported to investigate the BEC in TiSe 2 , no optoelectronic approach is discovered to reveal the BEC in TiSe 2 .…”

Section: Introductionmentioning

confidence: 99%

High sensitivity of semimetal photodetection via Bose–Einstein condensation

Wu,

Qiu,

et al. 2023

InfoMat

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The discovery of semiconductor has witnessed remarkable strides toward high performance of photodetectors attributed to its excellent carrier properties. However, semimetal, owning to the high carrier concentration and low carrier mobility compared to those of semiconductor, is generally considered unsuitable for photodetection. Herein, we demonstrate an outstanding photodetection in a layered semimetal titanium diselenide (TiSe2) in Bose–Einstein condensation (BEC) state. High sensitivity of semimetal photodetector is realized in the range of visible, infrared and terahertz bands. The noise equivalent power (NEP) has threefold improvement at the visible and infrared wavebands, and significant decrease by one order of magnitude in the terahertz frequencies via BEC phenomenon, attributed to the electrical parameter variation after condensation. The best NEP value in the terahertz frequency is comparable to that of commercial Si photodetector. Our results show another recipe to fabricate high performance of photodetection via semimetal except for semiconductor and pave the way to exploit macroscopic quantum phenomena for optoelectronics.image

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“…The suppression of the CDW order in TiSe 2 has been studied upon Cu intercalation [13,14], Ti intercalation [22,23], and at high pressures [12,17,24,25]. However, these high-pressure studies obtained different critical pressures of the CDW phase, P CDW , ranging from ≈3.5 GPa to 5.1 GPa.…”

Section: Introductionmentioning

confidence: 99%

Suppression of charge-density-wave order in TiSe₂ studied with high-pressure magnetoresistance

et al. 2022

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TiSe2 undergoes charge density wave (CDW) order which can be suppressed under pressure. We use high-resolution electrical resistivity and magnetoresistance measurements to trace the CDW to the highest pressures of any transport study so far. Comparison with previous work shows that the CDW is very sensitive to pressure conditions resulting in a reduced critical pressure in the presence of non-hydrostaticity. Our analysis indicates that in perfect pressure conditions the intrinsic critical pressure might be as high as 5.6 GPa. At the same time, we observe signatures of enhanced scattering linked to the critical pressure, PCDW. The sensitivity of PCDW to non-hydrostaticity and the enhanced scattering linked to it raises questions of how the superconductivity induced in TiSe2 under pressure is related to the CDW order.

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Perturbation of charge density waves in 1T−TiSe2

Cited by 7 publications

References 49 publications

Charge density waves in two-dimensional transition metal dichalcogenides

Charge density waves in two-dimensional transition metal dichalcogenides

High sensitivity of semimetal photodetection via Bose–Einstein condensation

Suppression of charge-density-wave order in TiSe₂ studied with high-pressure magnetoresistance

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Perturbation of charge density waves in 1T−TiSe2

Cited by 7 publications

References 49 publications

Charge density waves in two-dimensional transition metal dichalcogenides

Charge density waves in two-dimensional transition metal dichalcogenides

High sensitivity of semimetal photodetection via Bose–Einstein condensation

Suppression of charge-density-wave order in TiSe2 studied with high-pressure magnetoresistance

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Product

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Suppression of charge-density-wave order in TiSe₂ studied with high-pressure magnetoresistance