Femtosecond studies of the phase transition in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ti</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Zeiger, H. J.; Cheng, Tao; Ippen, Erich P.; Vidal, J.; Dresselhaus, G.; Dresselhaus, M. S.

doi:10.1103/physrevb.54.105

Cited by 27 publications

(8 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…It may indicate insulator-metal transition, which takes place on the surface. This is because that at about T c = 450 K, Ti 2 O 3 exhibits a smooth insulator-metal transition with increasing temperature [21][22][23][24][25][26]. The disappearance of the pseudo-gap was reversible and it appeared when the temperature was lowered to room temperature.…”

Section: Surface Modifications At High Temperaturesmentioning

confidence: 99%

“…As was established the change in the conductivity of Ti 2 O 3 above T c is caused by broad crossover between a 1g and e p g þ e p Ã g bands [21][22][23][24][25][26]. It should be stressed that at this temperature range the disappearance of very pronounced two surface states at energy about 0.4 eV below the Fermi level and at about 0.4 eV above the Fermi level (i.e.…”

Section: Surface Modifications At High Temperaturesmentioning

confidence: 99%

See 1 more Smart Citation

Room and high-temperature scanning tunnelling microscopy and spectroscopy (HT-STM/STS) investigations of surface nanomodifications created on the TiO2(110) surface

et al. 2007

View full text Add to dashboard Cite

Section: Surface Modifications At High Temperaturesmentioning

confidence: 99%

Section: Surface Modifications At High Temperaturesmentioning

confidence: 99%

Room and high-temperature scanning tunnelling microscopy and spectroscopy (HT-STM/STS) investigations of surface nanomodifications created on the TiO2(110) surface

et al. 2007

View full text Add to dashboard Cite

“…Ultrafast photoexcitation thus launches a coherent structural deformation of excited dimers [marker (ii) in Fig. 4(b)] followed by oscillations at 6 THz around the new potential minimum [11,25].…”

mentioning

confidence: 99%

Coherent Structural Dynamics and Electronic Correlations during an Ultrafast Insulator-to-Metal Phase Transition inVO2

et al. 2007

View full text Add to dashboard Cite

We directly trace the multi-THz conductivity of VO2 during an insulator-metal transition triggered by a 12-fs light pulse. The femtosecond dynamics of lattice and electronic degrees of freedom are spectrally discriminated. A coherent wave packet motion of V-V dimers at 6 THz modulates the lattice polarizability for approximately 1 ps. In contrast, the electronic conductivity settles to a constant value already after one V-V oscillation cycle. Based on our findings, we propose a qualitative model for the nonthermal phase transition.

show abstract

“…If the force generated is fast compared with the period of the phonon, then coherent motions of the lattice, or coherent phonons, are induced. This motion can be tracked in the time domain by measuring the effects of the coherent phonons on the transient reflectivity of a material and has been used extensively as a probe to study the lattice in near-equilibrium conditions in the vicinity of phase transitions 11 , as well as to look at phonon softening [12][13][14] and hardening 15 when the system is strongly driven. Phonon softening or hardening results from a change in the curvature 16,17 of the lattice potential, but not from a change in the symmetry of the potential.…”

mentioning

confidence: 99%

Ultrafast changes in lattice symmetry probed by coherent phonons

et al. 2012

View full text Add to dashboard Cite

The electronic and structural properties of a material are strongly determined by its symmetry. Changing the symmetry via a photoinduced phase transition offers new ways to manipulate material properties on ultrafast timescales. However, to identify when and how fast these phase transitions occur, methods that can probe the symmetry change in the time domain are required. Here we show that a time-dependent change in the coherent phonon spectrum can probe a change in symmetry of the lattice potential, thus providing an all-optical probe of structural transitions. We examine the photoinduced structural phase transition in Vo 2 and show that, above the phase transition threshold, photoexcitation completely changes the lattice potential on an ultrafast timescale. The loss of the equilibrium-phase phonon modes occurs promptly, indicating a non-thermal pathway for the photoinduced phase transition, where a strong perturbation to the lattice potential changes its symmetry before ionic rearrangement has occurred.

show abstract

Femtosecond studies of the phase transition inTi2O3

Cited by 27 publications

References 27 publications

Room and high-temperature scanning tunnelling microscopy and spectroscopy (HT-STM/STS) investigations of surface nanomodifications created on the TiO2(110) surface

Room and high-temperature scanning tunnelling microscopy and spectroscopy (HT-STM/STS) investigations of surface nanomodifications created on the TiO2(110) surface

Coherent Structural Dynamics and Electronic Correlations during an Ultrafast Insulator-to-Metal Phase Transition inVO2

Ultrafast changes in lattice symmetry probed by coherent phonons

Contact Info

Product

Resources

About