Scanning tunneling microscopy of 1<i>T</i>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">TiSe</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>and 1<i>T</i>-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">TiS</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:ma

Slough, C. G.; Giambattista, B.; Johnson, Amber; McNairy, W. W.; Wang, C.; Coleman, R. V.

doi:10.1103/physrevb.37.6571

Cited by 40 publications

(14 citation statements)

References 9 publications

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“…18 The CDW phase could be identified using scanning tunneling microscopy (STM) via the opening of a gap in the Fermi surface which modifies the local density of states. [22][23][24][25] Such a CDW has been also predicted in graphene/h-BN/graphene heterostructures in a high magnetic field. 19 The experimental consequence of a CDW state in such systems would be the reentrant integer quantum Hall effect behavior of electrons in a perpendicular magnetic field.…”

Section: Introductionsupporting

confidence: 55%

Anisotropic charge density wave in electron-hole double monolayers: Applied to phosphorene

et al. 2018

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The possibility of an inhomogeneous charge density wave phase is investigated in a system of two coupled electron and hole monolayers separated by a hexagonal boron nitride insulating layer. The charge density wave state is induced through the assumption of negative compressibility of electron/hole gases in a Coulomb drag configuration between the electron and hole sheets. Under equilibrium conditions, we derive analytical expressions for the density oscillation along the zigzag and armchair directions. We find that the density modulation not only depends on the sign of the compressibility but also on the anisotropy of the low energy bands. Our results are applicable to any two dimensional system with anisotropic parabolic bands, characterized by different effective masses. For equal effective masses, i.e., isotropic energy bands, our results agree with Hrolak et al.. 1 Our numerical results are applied to phosphorene. PACS numbers: 71.35.-y, 73.21.-b, 74.78.Fk arXiv:1811.12268v1 [cond-mat.mes-hall]

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Section: Introductionsupporting

confidence: 55%

Anisotropic charge density wave in electron-hole double monolayers: Applied to phosphorene

et al. 2018

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“…Angle-resolved photoemission of TiS 2 showed the presence of electrons in the Ti 3d band, consistent with the observed n-type conductivity. [12][13][14][15][21][22][23][24] These experimental data did not reveal the presence of holes in the S 3p valence band of TiS 2 . This was taken as evidence for the semiconducting character of TiS 2 , and from the data an energy gap of 0.3Ϯ0.2 eV was deduced.…”

Section: Introductionmentioning

confidence: 99%

Bulk and surface electronic structure of1T−TiS2and1T−
Fang
¹
,
Groot
²
,
Haas
³

1997
Phys. Rev. B
185
10
107
1
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Ab initio band-structure calculations were performed for bulk, single slab, and thin films of TiX 2 ͑XϭS, Se͒ using the localized spherical wave method. According to these calculations, bulk TiS 2 and TiSe 2 are semimetallic. The calculations show that TiS 2 thin films are semiconductors, but thin films of TiSe 2 are semimetallic. The indirect gap for single slab TiS 2 is about 1.0 eV, and the gap becomes smaller with increasing number of layers. When the number of layers increases to 11, the TiS 2 thin films are semimetallic. All but the surface layers are found to be electrically neutral. The density of states as a function of the energy for the surface layer is different from that of the bulk. The Madelung energy of the Ti atoms on the surface is about 0.35 eV lower than that for the Ti atoms in the bulk. The calculations are compared with photoemission spectra, reported in the literature. ͓S0163-1829͑97͒05532-X͔

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“…In this paper we report the chirality of a CDW in 1T-TiSe 2 [5][6][7][8][9][10][11][12] measured directly by using STM and optical ellipsometry. STM is used to investigate the microscopic electron distribution and the phase of the CDW order parameter in real space [5,6,13]. In the measurement, the CDW intensity becomes Ia 1 : Ia 2 : Ia 3 = 1 : 0.7 ± 0.1 : 0.5 ± 0.1, where Ia i (i =1, 2, 3) is the amplitude of the tunnelling current contributed by the CDWs.…”

mentioning

confidence: 99%

Chiral Charge-Density Waves

et al. 2010

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We discovered the chirality of charge density waves (CDW) in 1T-TiSe 2 by using scanning tunnelling microscopy (STM) and optical ellipsometry. We found that the CDW intensity becomes Ia 1 : Ia 2 : Ia 3 = 1 : 0.7 ± 0.1 : 0.5 ± 0.1, where Ia i (i =1, 2, 3) is the amplitude of the tunnelling current contributed by the CDWs. There were two states, in which the three intensity peaks of the CDW decrease clockwise and anticlockwise when we index each nesting vector in order of intensity in the Fourier transformation of the STM images. The chirality in CDW results in the three-fold symmetry breaking. Macroscopically, two-fold symmetry was indeed observed in optical measurement. We propose the new generalized CDW chirality H CDW ≡ q 1 · (q 2 × q 3 ), where q i are the nesting vectors, which is independent of the symmetry of components. The nonzero H CDW -the triple-q vectors do not exist in an identical plane in the reciprocal space -should induce a real-space chirality in CDW system.

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Scanning tunneling microscopy of 1T-TiSe2and 1T-TiS2

Cited by 40 publications

References 9 publications

Anisotropic charge density wave in electron-hole double monolayers: Applied to phosphorene

Anisotropic charge density wave in electron-hole double monolayers: Applied to phosphorene

Bulk and surface electronic structure of1T−TiS2and1T−
Fang
¹
,
Groot
²
,
Haas
³

1997
Phys. Rev. B
185
10
107
1
View full text Add to dashboard Cite

Chiral Charge-Density Waves

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Scanning tunneling microscopy of 1T-TiSe2and 1T-TiS2

Cited by 40 publications

References 9 publications

Anisotropic charge density wave in electron-hole double monolayers: Applied to phosphorene

Anisotropic charge density wave in electron-hole double monolayers: Applied to phosphorene

Bulk and surface electronic structure of1T−TiS2and1T−Fang1, Groot2, Haas3 1997Phys. Rev. B185101071View full textAdd to dashboardCite

Chiral Charge-Density Waves

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About

Bulk and surface electronic structure of1T−TiS2and1T−
Fang
¹
,
Groot
²
,
Haas
³

1997
Phys. Rev. B
185
10
107
1
View full text Add to dashboard Cite