Ultrafast terahertz conductivity of photoexcited nanocrystalline silicon

Cooke, David G.; MacDonald, A. Nicole; Hryciw, Aaron C.; Meldrum, A.; Wang, Juan; Li, Quan; Hegmann, Frank A.

doi:10.1007/s10854-007-9248-y

Cited by 25 publications

(41 citation statements)

References 17 publications

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“…TRTS has since evolved into a free-space pump-probe technique, and has had a wide impact on our understanding of ultrafast phenomena, particularly in condensed matter systems such as bulk semiconductors [2,5,[168][169][170][171][172][173] and their nanostructures [5,7,[174][175][176][177][178][179][180][181][182][183][184], dielectrics [185], organic semiconductors [186][187][188][189][190][191][192][193][194][195][196] or semimetals [197] and correlated electron materials [7,184,[198][199][200]. The power of the technique lies in mapping the dynamics of the broadband optical response functions, such as the complex optical conductivity, over THz frequencies as it evolves after photoexcitation.…”

Section: Methodsmentioning

confidence: 99%

Terahertz spectroscopy and imaging – Modern techniques and applications

Jepsen

Cooke

Koch

2010

Laser & Photonics Reviews

1,693

977

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Over the past three decades a new spectroscopic technique with unique possibilities has emerged. Based on coherent and time-resolved detection of the electric field of ultrashort radiation bursts in the far-infrared, this technique has become known as terahertz time-domain spectroscopy (THz-TDS). In this review article the authors describe the technique in its various implementations for static and time-resolved spectroscopy, and illustrate the performance of the technique with recent examples from solid-state physics and physical chemistry as well as aqueous chemistry. Examples from other fields of research, where THz spectroscopic techniques have proven to be useful research tools, and the potential for industrial applications of THz spectroscopic and imaging techniques are discussed.

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Section: Methodsmentioning

confidence: 99%

Terahertz spectroscopy and imaging – Modern techniques and applications

Jepsen

Cooke

Koch

2010

Laser & Photonics Reviews

1,693

977

View full text Add to dashboard Cite

show abstract

“…23,29,[34][35][36]39,71,73,76 Alternatively, the Drude-Smith model has also been used as an EMT in its own right and fit directly to the measured THz conductivity. [9][10][11][12][13][14][15][16][17][18][19]21,22,[25][26][27]30,31,33,38,[41][42][43][44][45]48 Each approach begins with a different physical process and leads to its own difficulties when one interprets the subsequent fits to the data. In the former case, depolarization fields are included explicitly and treated as independent from weak confinement.…”

Section: −48mentioning

confidence: 99%

Microscopic origin of the Drude-Smith model

et al. 2017

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The Drude-Smith model has been used extensively in fitting the THz conductivities of nanomaterials with carrier confinement on the mesoscopic scale. Here, we show that the conventional 'backscattering' explanation for the suppression of low-frequency conductivities in the Drude-Smith model is not consistent with a confined Drude gas of classical non-interacting electrons and we derive a modified Drude-Smith conductivity formula based on a diffusive restoring current. We perform Monte Carlo simulations of a model system and show that the modified Drude-Smith model reproduces the extracted conductivities without free parameters. This alternate route to the DrudeSmith model provides the popular formula with a more solid physical foundation and well-defined fit parameters.

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“…It is of interest to know what happen in inhomogeneous media. It is known that a deviation from Drude behavior is observed in most electronically conductive nanostructured materials, such as metals [4][5][6], semiconductors [7][8][9][10][11][12][13][14][15][16], and oxides [17][18][19]. The non-Drude behavior in nanomaterials is a kind of Lorentz resonance.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of Carrier Transport in Nanoscale Materials: Origin of Non-Drude Behavior in the Terahertz Frequency Range

Shimakawa

Kasap

2016

Applied Sciences

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Abstract:It is known that deviation from the Drude law for free carriers is dramatic in most electronically conductive nanomaterials. We review recent studies of the conductivity of nanoscale materials at terahertz (THz) frequencies. We suggest that among a variety of theoretical formalisms, a model of series sequence of transport involving grains and grain boundaries provides a reasonable explanation of Lorentz-type resonance (non-Drude behavior) in nanomaterials. Of particular interest is why do free carriers exhibit a Lorentz-type resonance.

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Ultrafast terahertz conductivity of photoexcited nanocrystalline silicon

Cited by 25 publications

References 17 publications

Terahertz spectroscopy and imaging – Modern techniques and applications

Terahertz spectroscopy and imaging – Modern techniques and applications

Microscopic origin of the Drude-Smith model

Dynamics of Carrier Transport in Nanoscale Materials: Origin of Non-Drude Behavior in the Terahertz Frequency Range

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