2014
DOI: 10.1021/nl500042x
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Direct Observation of Nanoscale Peltier and Joule Effects at Metal–Insulator Domain Walls in Vanadium Dioxide Nanobeams

Abstract: The metal to insulator transition (MIT) of strongly correlated materials is subject to strong lattice coupling, which brings about the unique one-dimensional alignment of metal−insulator (M−I) domains along nanowires or nanobeams. Many studies have investigated the effects of stress on the MIT and hence the phase boundary, but few have directly examined the temperature profile across the metal−insulating interface. Here, we use thermoreflectance microscopy to create two-dimensional temperature maps of singlecr… Show more

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Cited by 41 publications
(44 citation statements)
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“…3(a), and a current density of 27 × 10 8 A/m 2 (I = 15 µA) exerts the maximum cooling ability of approximately ∆T=3 K. The required current in calculation for the cooling provides good agreement with the experimental values for Peltier cooling at the metal-insulator boundary in VO 2 nanobeams. 6 In Fig. 2(b), current density ranging from 2.7 × 10 8 A/m 2 to 7 × 10 8 A/m 2 induced the resistance leaps, which is well acceptable by theoretical calculation because the temperature cooling ability occurs roughly from 0.3 K to 1.1 K, which is expected to cause a M-to-I transition in a domain.…”
Section: Resultssupporting
confidence: 67%
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“…3(a), and a current density of 27 × 10 8 A/m 2 (I = 15 µA) exerts the maximum cooling ability of approximately ∆T=3 K. The required current in calculation for the cooling provides good agreement with the experimental values for Peltier cooling at the metal-insulator boundary in VO 2 nanobeams. 6 In Fig. 2(b), current density ranging from 2.7 × 10 8 A/m 2 to 7 × 10 8 A/m 2 induced the resistance leaps, which is well acceptable by theoretical calculation because the temperature cooling ability occurs roughly from 0.3 K to 1.1 K, which is expected to cause a M-to-I transition in a domain.…”
Section: Resultssupporting
confidence: 67%
“…By substituting the empirical parameters for VO 2 into Eq. (2) and supposing that the local area corresponds to one domain size, which is 100 nm (l) × 120 nm (w) × 70 nm (t), and the gradient length is 100 nm, which is a reasonable order from the observation of the nanoscale Peltier effect at the interface, 6 we can obtain the guideline for the magnitude of the cooling and heating ability against current density in the local area. This model is useful in spite of simple one under adiabatic and equilibrium states.…”
Section: Resultsmentioning
confidence: 99%
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“…It is worth mentioning that there is still no model about the MIT that can explain all experiment results, and the precise mechanism of the MIT in VO 2 is mainly dispute among electron‐correlation‐driven Mott transition, structure‐driven Peierls transition, and the cooperation of these two mechanisms . Based on the MIT, VO 2 is candidates for a variety of important technologies, including thermochromic smart windows, thermoelectrics, hydrogen storage, sensors, field‐effect, memories, terahertz and photoelectric devices …”
Section: Introductionmentioning
confidence: 99%