Theory of Laser-Controlled Competing Superconducting and Charge Orders

Sentef, Michael A.; Tokuno, Akiyuki; Georges, Antoine; Kollath, Corinna

doi:10.1103/physrevlett.118.087002

Cited by 99 publications

(98 citation statements)

References 42 publications

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“…The differences may derive from more complex physics including amplitude fluctuations, lattice distortion, 14,23 or competing charge order. 25,27 We have also demonstrated that admixing higher harmonics in the driving operation can result in an additional enhancement of the c-axis transport. This observation opens the door towards optimal control of superconductivity via optical driving, by combining several higher harmonics.…”

Section: Bilayer Josephson Junctionsmentioning

confidence: 73%

“…56 These discrepancies may arise due to physics that is not included in our simulation such as finite temperature effects, amplitude fluctuations of the order parameter, nonlinear lattice distortion, 14,23 and competing orders. 25,27 V. CONCLUSIONS…”

Section: Bilayer Josephson Junctionsmentioning

confidence: 99%

“…These intriguing experimental results were studied theoretically in Refs. [22][23][24][25][26][27]. However, these studies primarily focused on the steady state of this driven system, while the experimental operation uses a pump pulse, with a pulse length that is typically around five times of the inverse optical frequency.…”

Section: Introductionmentioning

confidence: 99%

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Transiently enhanced interlayer tunneling in optically driven high- Tc superconductors

Okamoto

Cavalleri

et al. 2017

Phys. Rev. B

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Recent pump-probe experiments reported an enhancement of superconducting transport along the c axis of underdoped YBa2Cu3O 6+δ (YBCO), induced by a midinfrared optical pump pulse tuned to a specific lattice vibration. To understand this transient nonequilibrium state, we develop a pump-probe formalism for a stack of Josephson junctions, and we consider the tunneling strengths in the presence of modulation with an ultrashort optical pulse. We demonstrate that a transient enhancement of the Josephson coupling can be obtained for pulsed excitation and that this can be even larger than in a continuously driven steady state. Especially interesting is the conclusion that the effect is largest when the material is parametrically driven at a frequency immediately above the plasma frequency, in agreement with what is found experimentally. For bilayer Josephson junctions, an enhancement similar to that experimentally is predicted below the critical temperature Tc. This model reproduces the essential features of the enhancement measured below Tc. To reproduce the experimental results above Tc, we will explore extensions of this model, such as in-plane and amplitude fluctuations, elsewhere.

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Section: Bilayer Josephson Junctionsmentioning

confidence: 73%

Section: Bilayer Josephson Junctionsmentioning

confidence: 99%

See 1 more Smart Citation

Transiently enhanced interlayer tunneling in optically driven high- Tc superconductors

Okamoto

Cavalleri

et al. 2017

Phys. Rev. B

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“…The main advantage of the general relation (49) is that the computation of the nonlinear optical kernel K(ω) within a specific and controlled approximation allows one to address separately the various physical processes relevant for each system, and to test the results against the experiments. This approach can lead to a considerable advantage in the case of collective electronic modes across a phase transition, when the full numerical solution of a time-dependent problem is computationally challenging [19][20][21][22][23][24][25][26][27][28] , and does not always allow one to disentangle the contributions from different excitations channels. This is exactly what happens for the 2∆ oscillations in a superconductor, that have been ascribed so far either to the excitation of densitylike fluctuations 14 or to the Higgs mode [4][5][6] .…”

Section: Discussionmentioning

confidence: 99%

Theory of coherent-oscillations generation in terahertz pump-probe spectroscopy: From phonons to electronic collective modes

2019

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Time-resolved spectroscopies using intense THz pulses appear as a promising tool to address collective electronic excitations in condensed matter. In particular recent experiments showed the possibility to selectively excite collective modes emerging across a phase transition, as it is the case for superconducting and charge-density-wave (CDW) systems. One possible signature of these excitations is the emergence of coherent oscillations of the differential probe field in pump-probe protocols. While the analogy with the case of phonon modes suggests that the basic underlying mechanism should be a sum-frequency stimulated Raman process, a general theoretical scheme able to describe the experiments and to define the relevant optical quantity is still lacking. Here we provide this scheme by showing that coherent oscillations as a function of the pump-probe time delay can be linked to the convolution in the frequency domain between the squared pump field and a Raman-like non-linear optical kernel. This approach is applied and discussed in few paradigmatic examples: ordinary phonons in an insulator, and collective charge and Higgs fluctuations across a superconducting and a CDW transition. Our results not only account very well for the existing experimental data in a wide variety of systems, but they also offer an useful perspective to design future experiments in emerging materials.In the last decade, a significant advance in the investigation of complex systems has been gained thanks to the huge experimental progress in time-resolved spectroscopic techniques 1,2 . On very general grounds, the basic idea behind any pump-probe protocol is to first excite the system with a short and very intense electromagnetic pulse (pump), and then to monitor its relaxation towards equilibrium by using a secondary, weak pulse (probe) applied with a finite time delay with respect to the pump. This general protocol can then be implemented in several different ways, according to the nature of the spectroscopic measurement (angle-resolved photoemission, optical reflection or transmission, etc.) or to the wavelength of the pump/probe fields. However, in all cases one has to face with two phenomena which mark the difference with respect to ordinary equilibrium spectroscopies: (i) the use of an intense pulse triggers in general non-linear optical processes; (ii) the subsequent relaxation encodes by definition non-equilibrium phenomena on time scales which depend on the characteristics of the experiment and of the system under investigation. Due in part to these innovative aspects, many pump-probe protocols still lack a general theoretical framework able to connect the measured quantities to the material properties. More specifically, while Kubo linear-response theory 3 represents nowadays the standard theoretical tool needed to compute the optical response of any system to a weak external perturbation, an analogous protocol for timeresolved spectroscopies has not been established yet.The present work aims at filling in part this knowl- * mat...

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“…This model describing CDW and SC order [40,50,51] and its experimental realizations in cold atom systems has recently shed new light on the dynamics of charge and spin fluctuations [52][53][54][55].…”

Section: Model and Formalismmentioning

confidence: 99%

Nonthermal switching of charge order: Dynamical slowing down and optimal control

2018

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We investigate the laser-induced dynamics of electronically driven charge-density-wave (CDW) order. A comprehensive mean-field analysis of the attractive Hubbard model in the weak-coupling regime reveals ultrafast switching and ultrafast melting of the order via a nonthermal pathway. The resulting nonequilibrium phase diagram exhibits multiple distinct regimes of the order parameter dynamics upon increasing field strength, indicative of multiple dynamical phase transitions. Using an intuitive pseudospin picture, we show how the distinct dynamical regimes can be connected to the spin precession angle. We furthermore study the effects of electron-electron interactions beyond mean field to show that the main features of the phase diagram are robust against scattering or thermalization processes. For example, the nonthermal state with switched order is characterized by a particularly slow relaxation. The nonthermal phases can be stabilized by tailoring the pulse shape with optimal control theory. We also demonstrate how the dynamics allows to distinguish an electron-electron interaction driven CDW from an electron-phonon interaction driven CDW.

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Theory of Laser-Controlled Competing Superconducting and Charge Orders

Cited by 99 publications

References 42 publications

Transiently enhanced interlayer tunneling in optically driven high- Tc superconductors

Transiently enhanced interlayer tunneling in optically driven high- Tc superconductors

Theory of coherent-oscillations generation in terahertz pump-probe spectroscopy: From phonons to electronic collective modes

Nonthermal switching of charge order: Dynamical slowing down and optimal control

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