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Spielman, Steven R.; Parks, Beth; Orenstein, Joseph; Nemeth, D. T.; Ludwig, Frank; Clarke, John; Merchant, Paul; D, Lew

doi:10.1103/physrevlett.73.1537

Cited by 75 publications

(55 citation statements)

References 9 publications

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“…195,191. The imaginary part of conductivity decreases with T at any frequency, and the peak in σ 2 (ω) increases in magnitude and shifts to lower T with decreasing T 190,191,189 . At frequencies above 1500cm −1 both σ 1 and σ 2 depend weakly on T and are comparable in amplitude.…”

Section: The Optical Conductivitymentioning

confidence: 93%

A Spin Fluctuation Model for d-Wave Superconductivity

Chubukov¹,

Pines²,

Schmalian³

2003

The Physics of Superconductors

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We review the results of the spin-fermion model for correlated electron materials that are sufficiently close to an antiferromagnatic instability that their staggered static magnetic susceptibility in the normal state is large compared to that found in a conventional Fermi liquid. We demonstrate that for such materials magnetically-mediated superconductivity, brought about by the exchange of spin fluctuations, is a viable alternative to conventional phonon-mediated pairing, and leads to pairing in the d x 2 −y 2 channel. If the dominant interaction between quasiparticles is of electronic origin and, at energies much smaller than the fermionic bandwidth, can be viewed as being due to the emission and absorption of a collective, soft spin degree of freedom, the low-energy physics of these materials is accurately described by the spin-fermion model. The derived dynamic magnetic susceptibility and quasiparticle interaction coincide with the the phenomenonological forms used to fit NMR experiments and in earlier Eliashberg calculations. In discussing normal state properties, the pairing instability and superconducting properties, we focus our attention on those materials that, like the cuprate, organic, and some heavy electron superconductors, display quasi-two dimensional behavior. In the absence of superconductivity, at sufficiently low temperatures and energies, a nearly antiferromagnetic Fermi liquid is unconventional, in that the characteristic energy above which a Landau Fermi liquid description is no longer valid is not the Fermi energy, but is the much smaller spin-fluctuation energy,ω sf . For energies (or temperatures) between ω sf and the Fermi energy, the system behavior is quite different from that in a conventional Fermi liquid. Importantly, it is universal in that it is governed by just two input parameters -an effective spin-fermion interaction energy that sets the overall energy scale, and a dimensionless spin-fermion coupling constant that diverges at the antiferromagnetic quantum critical point. We discuss the pairing instability cased by the spin-fluctuation exchange, and "fingerprints" of a spin mediated pairing that are chiefly associated with the emergence of the resonance peak in the spin response of a d-wave superconductor. We identify these fingerprints in spectroscopic experiments on cuprateb superconconductors. We conclude with a discussion of open questions associated primarily with the nature of the pseudogap state found in underdoped cuprates.

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Section: The Optical Conductivitymentioning

confidence: 93%

A Spin Fluctuation Model for d-Wave Superconductivity

Chubukov¹,

Pines²,

Schmalian³

2003

The Physics of Superconductors

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“…This peak was also observed at THz frequencies by Nuss et al [8], and was attributed to a competition between two temperature dependences; the overall decrease with temperature of the number of thermally excited quasiparticles competing with a rapid increase below T c of the transport lifetime of these quasiparticles. This rapid increase in lifetime has been interpreted as a collapse of the inelastic scattering processes responsible for the large normal state resistivity of the high temperature superconductors and is an effect that is observed in thermal conductivity measurements [9] as well as in other electromagnetic absorption measurements at microwave [2,[10][11][12][13][14][15][16], far infrared [17] and THz frequencies [8,18,19]. The rapid increase in quasiparticle lifetime is well established by these measurements and the very long quasiparticle mean free paths resulting from this have been corroborated further by the thermal Hall effect measurements of Krishana et al [20].…”

Section: Introductionmentioning

confidence: 99%

Microwave spectroscopy of thermally excited quasiparticles inYBa2Cu3O<

et al. 1999

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We present here the microwave surface impedance of a high purity crystal of Y Ba2Cu3O6.99 measured at 5 frequencies between 1 and 75 GHz. This data set reveals the main features of the conductivity spectrum of the thermally excited quasiparticles in the superconducting state. Below 20 K there is a regime of extremely long quasiparticle lifetimes, due to both the collapse of inelastic scattering below Tc and the very weak impurity scattering in the high purity BaZrO3-grown crystal used in this study. Above 20 K, the scattering increases dramatically, initially at least as fast as T 4 .74.25.Nf,74.25.Fy

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“…These observations are inconsistent with multi-wave mixing theory, but support the gas-ionization model. This study pushes the development of the two-color scheme and provides a new dimension to explore the long-standing problem of the THz generation mechanism.Terahertz (THz) waves have broad applications in THz spectroscopy [1,2] and THz-field matter interactions [3,4]. These applications can potentially benefit from powerful THz radiation sources with various parameters via different laser-plasma-based schemes [5][6][7][8][9].…”

mentioning

confidence: 99%

Observation of Terahertz Radiation via the Two-Color Laser Scheme with Uncommon Frequency Ratios

Zhang

Wang

et al. 2017

Phys. Rev. Lett.

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In the widely-studied two-color laser scheme for terahertz (THz) radiation from a gas, the frequency ratio of the two lasers is usually fixed at ω2/ω1 =1:2. We investigate THz generation with uncommon frequency ratios. Our experiments show, for the first time, efficient THz generation with new ratios of ω2/ω1 =1:4 and 2:3. We observe that the THz polarization can be adjusted by rotating the longer-wavelength laser polarization and the polarization adjustment becomes inefficient by rotating the other laser polarization; the THz energy shows similar scaling laws with different frequency ratios. These observations are inconsistent with multi-wave mixing theory, but support the gas-ionization model. This study pushes the development of the two-color scheme and provides a new dimension to explore the long-standing problem of the THz generation mechanism.Terahertz (THz) waves have broad applications in THz spectroscopy [1,2] and THz-field matter interactions [3,4]. These applications can potentially benefit from powerful THz radiation sources with various parameters via different laser-plasma-based schemes [5][6][7][8][9]. For example, MV/cm-scale THz radiation with either linear [5,10,11] or elliptical polarization [12][13][14][15] can be generated from gas plasma. THz radiation of near mJ can be produced via relativistic laser interaction with solid plasma [8,[16][17][18]. Among these schemes, the two-color laser scheme [5] has been studied most widely [19][20][21][22][23][24][25][26][27][28] because it can provide high-efficiency tabletop broadband sources. Generally, an 800nm pump laser pulse passes through a frequency-doubling crystal to generate a second-harmonic pulse and then the two pulses are mixed to produce gas plasma. Up to now, the frequency ratio of the two-color pulses has been always taken as ω 2 /ω 1 =1:2 in experiments, although the fundamentalpulse wavelength longer than 800nm was adopted in recent experiments to enhance the THz strength [29][30][31] and the second-harmonic-pulse frequency was detuned to yield ultra-broadband radiation [32]. Since 2013 a few theoretical reports [33][34][35] have predicted that the twocolor scheme could be extended to uncommon frequency ratios such as ω 2 /ω 1 =1:4, 2:3, but these predictions have not yet been verified experimentally.In this Letter, we present the first experimental demonstration of THz generation with uncommon frequency ratios. With the ω 1 -laser wavelength fixed at 800nm and 400nm, respectively, a scan of the ω 2 -laser wavelength from 1200nm to 1600nm shows that the THz energies have three resonantlike peaks located near ω 2 /ω 1 = 1:4, 1:2, and 2:3. The energies at these peaks are at the same order. Beyond the previous predictions [33][34][35], we find that the THz polarization can be adjusted by rotating the ω 2 -pulse polarization and however, the polarization adjustment becomes inefficient by rotating the ω 1 -pulse polarization. In this Letter we define the ω 1 pulse as the higher-frequency one. These observations agree with our particle-in...

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Observation of the Quasiparticle Hall Effect in SuperconductingYBa2Cu3
Steven R. Spielman
¹
,
Beth Parks
²
,
Joseph Orenstein
³

et al.

Cited by 75 publications

References 9 publications

A Spin Fluctuation Model for d-Wave Superconductivity

A Spin Fluctuation Model for d-Wave Superconductivity

Microwave spectroscopy of thermally excited quasiparticles inYBa2Cu3O<

Observation of Terahertz Radiation via the Two-Color Laser Scheme with Uncommon Frequency Ratios

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Observation of the Quasiparticle Hall Effect in SuperconductingYBa2Cu3Steven R. Spielman1, Beth Parks2, Joseph Orenstein3 et al.

Cited by 75 publications

References 9 publications

A Spin Fluctuation Model for d-Wave Superconductivity

A Spin Fluctuation Model for d-Wave Superconductivity

Microwave spectroscopy of thermally excited quasiparticles inYBa2Cu3O<

Observation of Terahertz Radiation via the Two-Color Laser Scheme with Uncommon Frequency Ratios

Contact Info

Product

Resources

About

Observation of the Quasiparticle Hall Effect in SuperconductingYBa2Cu3
Steven R. Spielman
¹
,
Beth Parks
²
,
Joseph Orenstein
³

et al.