Increase in charge-density-wave potential of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>1</mml:mn><mml:mi>T</mml:mi><mml:mtext>−</mml:mtext><mml:msub><mml:mrow><mml:mi mathvariant="normal">TaS</mml:mi></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">Se</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>

Aiura, Y.; Hase, Izumi; Yagi-Watanabe, Kazutoshi; Bando, Hiroshi; Ozawa, K.; Tanaka, Kiyohisa; Kitagawa, Ryota; Maruyama, Shigeo; Iwase, Tetsuya; Nishihara, Y.; Horiba, Koji; Shiino, O.; Oshima, Masaharu; Nakatake, M.; Kubota, Masato; Ono, Kanta

doi:10.1103/physrevb.69.245123

Cited by 7 publications

(8 citation statements)

References 27 publications

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“…The results of ARPES measurements on 1T-TaS 2 are in principle consistent with this picture. The existence of the submanifolds has been confirmed [75,79,104] and some of the fine structure within the submanifolds, including subband dispersions, has been resolved [77,[109][110][111]. This is illustrated in figure 7(a) by the thick gray lines.…”

Section: Review Of Arpes Resultsmentioning

confidence: 89%

“…In the last couple of years, numerous ARPES studies have been performed on 1T-TaS 2 [68,77,79,92,[104][105][106][107][108][109][110][111][112], 2H-TaSe 2 [81,82,84,85,113,114] and 1T-TiSe 2 [11, 86-89, 115, 116]. Here, we will concentrate on the CDW/PLD-induced changes to the single-particle energies and the accompanying redistribution of spectral weight.…”

Section: Review Of Arpes Resultsmentioning

confidence: 99%

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On the origin of charge-density waves in select layered transition-metal dichalcogenides

Roßnagel

2011

J. Phys.: Condens. Matter

624

564

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The occurrence of charge-density waves in three selected layered transition-metal dichalcogenides-1T-TaS(2), 2H-TaSe(2) and 1T-TiSe(2)-is discussed from an experimentalist's point of view with a particular focus on the implications of recent angle-resolved photoelectron spectroscopy results. The basic models behind charge-density-wave formation in low-dimensional solids are recapitulated, the experimental and theoretical results for the three selected compounds are reviewed, and their band structures and spectral weight distributions in the commensurate charge-density-wave phases are calculated using an empirical tight-binding model. It is explored whether the origin of charge-density waves in the layered transition-metal dichalcogenides can be understood in a unified way on the basis of a few measured and calculated parameters characterizing the interacting electron-lattice system. It is found that the predictions of the standard mean-field model agree only semi-quantitatively with the experimental data and that there is not one generally dominant factor driving charge-density-wave formation in this family of layer compounds. The need for further experimental and theoretical scrutiny is emphasized.

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Section: Review Of Arpes Resultsmentioning

confidence: 89%

Section: Review Of Arpes Resultsmentioning

confidence: 99%

On the origin of charge-density waves in select layered transition-metal dichalcogenides

Roßnagel

2011

J. Phys.: Condens. Matter

624

564

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“…2b) can be used to estimate the lattice mismatches. Many TMD bulk alloys were synthesized in the last century such as Mo 1−x W x S 2 , 42 Mo 1−x W x Se 2 , 43 TaS 2(1−x) Se 2x , 44 ZrS 2(1−x) -Se 2x , 45 HfS 2(1−x) Se 2x 46 and ReS 2(1−x) Se 2x . 47 For TMD monolayer alloys, theoretical calculations have shown that ordered phases have a lower energy of a few meV than random phases 41,48 (Fig.…”

Section: Choices Of the End Materials For 2d Tmd Alloysmentioning

confidence: 99%

Two-dimensional transition metal dichalcogenide alloys: preparation, characterization and applications

2015

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Engineering electronic structure of atomically thin two-dimensional (2D) materials is of great importance to their potential applications. In comparison to numerous other approaches, such as strain and chemical functionization, alloying can continuously tune the band gaps in a wide energy range. Atomically thin 2D alloys have been prepared and studied recently due to their potential use in electronic and optoelectronic applications. In this review, we first summarize the preparation methods of 2D alloys (mainly on transition metal dichalcogenide (TMD) monolayer alloys), including mechanical exfoliation, physical vapor deposition (PVD), chemical vapor deposition (CVD) and chalcogen exchange. Then, atomic-resolution imaging, Raman and photoluminescence (PL) spectroscopy characterization of 2D alloys are reviewed, in which band gap tuning is discussed in detail based on the PL experiments and theoretical calculations. Finally, applications of 2D alloys in field-effect transistors (FETs), photocurrent generation and hydrogen evolution catalysis are reviewed.

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“…A third half-filled band straddling E F is further split at T MI with the opening of a correlation gap between an occupied lower Hubbard band ͑LHB͒ at −0.2 eV and an unoccupied upper band above E F . [18][19][20][21] Clearly, the three CDW subbands are not well defined for d-TaS 2 but the incipient CDW-induced splitting is revealed by strong deviations from the TB dispersion. This is again typical of the NC phase, where free electrons from the discommensurations can provide enough screening to prevent the Mott transition within the locally commensurate CDW islands.…”

mentioning

confidence: 99%

Superconducting phase in the layered dichalcogenide1T-TaS2upon inhibition of the metal-insulator transition

Piatek

Lin

et al. 2010

Phys. Rev. B

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When a Mott metal-insulator transition is inhibited by a small amount of disorder in the layered dichalcogenide 1T-TaS 2 , an inhomogeneous superconducting state arises below T = 2.1 K and coexists with a nearly commensurate charge-density wave. By angle-resolved photoelectron spectroscopy, we show that it emerges from a bad metal state with strongly damped quasiparticles. Superconductivity is almost entirely suppressed by an external magnetic field of 0.1 T. DOI: 10.1103/PhysRevB.81.172503 PACS number͑s͒: 74.62.Dh, 71.30.ϩh, 71.45.Lr, 74.25.Jb One of the most intriguing phenomena in the solid state is the occurrence of electronic instabilities toward broken symmetry states such as superconductivity ͑SC͒, density waves, charge and orbital order, or the Mott insulating state. When two or more instabilities are simultaneously at work, complex phase diagrams and unusual physical properties are found. Understanding such a coexistence or competition is therefore important. A related open issue is the emergence of SC from a normal state where the nature of the quasiparticles ͑QPs͒ is strongly modified by the interactions. Spectroscopic probes of the electronic states with momentum selectivity, namely, angle-resolved photoelectron spectroscopy ͑ARPES͒, can address these issues.Broken-symmetry phases are especially prominent in lowdimensional-quasi-one-dimensional ͑1D͒ and quasi-twodimensional ͑2D͒-materials.1 The 2D transition metal dichalcogenides ͑TMDs͒, in particular, exhibit a variety of charge-density wave ͑CDW͒ transitions.2 In their trigonal prismatic ͑2H͒ polytypes some of them also support SC, with critical temperatures as high as 7.2 K for NbSe 2 . ARPES has been used to identify in the band structure the favorable conditions for electronic instabilities. [3][4][5][6] According to the simplest Peierls scenario, the CDW is the result of a moderately strong electron-phonon ͑e-ph͒ interaction connecting electron and hole states across the well-nested Fermi surface ͑FS͒. SC is also a consequence of e-ph coupling, leading to the formation of Cooper pairs at the FS. Even if alternative scenarios been proposed which do not rely on nesting, 7,8 both CDW and SC tend to gap parts of the same FS and are generally considered to be competing.SC is usually not found in TMDs of the 1 T polytype, with TM ions in octahedral coordination, but it can be induced by doping or by external pressure. Recently, much interest has been raised by the observation that the balance between CDW and SC can be continuously tuned in the TMD TiSe 2 by a controlled intercalation of Cu atoms. 9 Here we consider the occurrence of SC in the isostructural TMD 1T-TaS 2 , which exhibits a unique sequence of CDW and Mott phases, as a result of the interplay of e-ph and Coulomb interactions.2 At room temperature ͑RT͒, the CDW is nearly commensurate ͑NC͒. It consists of a hexagonal array of domains separated by domain walls ͑discommensurations͒ where the CDW phase changes rapidly. The domain size and the CDW amplitude grow as temperature is reduced, ...

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Increase in charge-density-wave potential of1T−TaSxSe2−x

Cited by 7 publications

References 27 publications

On the origin of charge-density waves in select layered transition-metal dichalcogenides

On the origin of charge-density waves in select layered transition-metal dichalcogenides

Two-dimensional transition metal dichalcogenide alloys: preparation, characterization and applications

Superconducting phase in the layered dichalcogenide1T-TaS2upon inhibition of the metal-insulator transition

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