Charge-density-wave structure in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">NbSe</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>determined by scanning tunneling microscopy

Dai, Zhenxi; Slough, C. G.; Coleman, R. V.

doi:10.1103/physrevlett.66.1318

Cited by 52 publications

(23 citation statements)

References 11 publications

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“…When we consider the transition from the CDW band edge as the dominant process for the probe signal, the resonance energy should be shifted by the amount of gap energy. 2⌬ g2 is approximately 65-100 meV, 3,8,9 which is consistent with the difference in the resonance. Note that the probe signal also reflects the upper edge of the occupied electron band.…”

Section: Resultssupporting

confidence: 68%

Selective optical probing of the charge-density-wave phases inNbSe3

2007

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We report a study of the ultrafast single particle dynamics in quasi-one-dimensional NbSe 3 whisker crystals using a two-color pump-probe measurement. A selective enhancement of the relaxation dynamics connected with one of the two charge-density-wave ͑CDW͒ phases was realized by tuning the probe energy to around 1.5 eV, in which the temperature dependence across the corresponding phase transition shows a pronounced anomaly. A similar selective excitation was possible in the coherent CDW oscillation.

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Section: Resultssupporting

confidence: 68%

Selective optical probing of the charge-density-wave phases inNbSe3

2007

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“…However, in addition we find that Se atoms of column I1 also take part in the modulation, with amplitudes comparable to Se(II1) and Se(1). Contrary to the interpretation of (Dai et al, 1991) this does not imply that the CDW 213 S. VAN …”

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confidence: 54%

Structure of the double charge-density-wave state of NbSe₃

1993

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“…Results obtained at 4 K in liquid helium suggested that all three chains carry a strong CDW modulation. [17][18][19] A controversy arose because x-ray diffraction results showed that the largest displacive modulations occur on Nb͑III͒ and Nb͑I͒ while smaller displacive modulations affect the Se atoms of chains I, II, and III directly bonded to Nb͑III͒ and Nb͑I͒. 15 This discrepancy between x-ray diffraction and STM results, concerning the strong q 2 CDW modulation measured by STM on chains II, was partially solved by tight-binding calculations for a slab.…”

Section: Introductionmentioning

confidence: 93%

Scanning tunneling microscopy at theNbSe3surface: Evidence for interaction betweenq1and
Brun
¹
,
Wang
²
,
Monçeau
³

2009
Phys. Rev. B

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We have investigated both q 1 and q 2 charge density wave ͑CDW͒ states taking place in NbSe 3 by means of low-temperature scanning tunneling microscopy ͑STM͒ under ultrahigh vacuum on the in situ cleaved ͑b , c͒ surface. High-resolution topographical images with atomic lattice resolution were obtained in the temperature range between 5 and 140 K. The careful and thorough analysis of the dependence of the STM images on bias polarity, energy, and temperature allowed us to identify unambiguously the three different types of chains composing the NbSe 3 unit cell at all temperatures, resolving contradictions from previous STM results. From two-dimensional Fourier transform of the STM images, we show that at the surface plane both CDW's wave vectors are in very good agreement with bulk reported values projected on the ͑b , c͒ plane. The q 1 CDW has, for wave vector, q 1 = 0.24b ‫ء‬ . Spatially, the q 1 modulation is essentially developed on type III chains with a weak contribution on type II neighboring chains. The q 2 CDW has, for wave vector, the projected value q 2p = 0.26b ‫ء‬ + 0.5c ‫ء‬ . This modulation is mainly developed on type I chains but surprisingly has an important contribution on type III chains with an amplitude similar to the q 1 contribution on these chains. This simultaneous double modulation on chain III leads to a beating phenomenon between the q 1 and q 2p periodicities and gives rise to a new domain superstructure developed along the chain axis which is characterized by the vector u =2ϫ ͑q 2p − q 1 ͒ − c ‫ء‬ =2ϫ ͑0.26− 0.24͒b ‫ء‬ . We believe that these new features give a clue of the coupling between the q 1 and q 2 CDWs in the pinned regime. Whereas most studies investigated the various characteristics of both CDWs by probing the Nb atoms properties, our results are consistent with the interpretation according to which the electronic local density of states probed by STM is mostly that of the surface Se atoms.

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Charge-density-wave structure inNbSe3determined by scanning tunneling microscopy

Cited by 52 publications

References 11 publications

Selective optical probing of the charge-density-wave phases inNbSe3

Selective optical probing of the charge-density-wave phases inNbSe3

Structure of the double charge-density-wave state of NbSe₃

Scanning tunneling microscopy at theNbSe3surface: Evidence for interaction betweenq1and
Brun
¹
,
Wang
²
,
Monçeau
³

2009
Phys. Rev. B

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Charge-density-wave structure inNbSe3determined by scanning tunneling microscopy

Cited by 52 publications

References 11 publications

Selective optical probing of the charge-density-wave phases inNbSe3

Selective optical probing of the charge-density-wave phases inNbSe3

Structure of the double charge-density-wave state of NbSe3

Scanning tunneling microscopy at theNbSe3surface: Evidence for interaction betweenq1andBrun1, Wang2, Monçeau3 2009Phys. Rev. B

Contact Info

Product

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About

Structure of the double charge-density-wave state of NbSe₃

Scanning tunneling microscopy at theNbSe3surface: Evidence for interaction betweenq1and
Brun
¹
,
Wang
²
,
Monçeau
³

2009
Phys. Rev. B