Efficient prediction of time- and angle-resolved photoemission spectroscopy measurements on a nonequilibrium BCS superconductor

Xu, Tianrui; Morimoto, Takahiro; Lanzara, Alessandra; Moore, Joel E.

doi:10.1103/physrevb.99.035117

Cited by 8 publications

(11 citation statements)

References 61 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also for k < 0.75 the oscillation affects the effective energy bands in terms of a small shift in the chemical potential. The observation of both amplitude and energy oscillations has also been proposed to observe superconducting Higgs modes in tr-ARPES type experiments [43][44][45][46]. To further elucidate the effect of stronger pump pulses we investigate a case, in which the Kondo screening is more strongly affected.…”

Section: Resultsmentioning

confidence: 96%

Ultrafast Optical Control of Magnetic Order and Fermi Surface Topology at a Quantum Critical Point

Fauseweh,

Zhu

2021

Preprint

View full text Add to dashboard Cite

Designing material properties on demand has important implications to potential future technological applications. While theoretically it is always possible to tune various intrinsic energy scales, there are fundamental limitations to this approach in experiment. In recent years, ultrafast spectroscopy has evolved as a promising tool to use light to dynamically induce non-trivial electronic states of matter. Here we theoretically investigate light pulse driven dynamics in a Kondo system close to quantum criticality. We show, that light can dehybridize the local Kondo screening and induce magnetic order out of a previously paramagnetic state. We demonstrate that, depending on the laser pulse field parameters, it is possible to deconfine the Kondo singlet and thereby induce second order phase transition to a dynamically ordered state, as well as a dynamic Lifshitz transition that changes the Fermi surface topology from hole-to electron-like.

show abstract

Section: Resultsmentioning

confidence: 96%

Ultrafast Optical Control of Magnetic Order and Fermi Surface Topology at a Quantum Critical Point

Fauseweh,

Zhu

2021

Preprint

View full text Add to dashboard Cite

show abstract

“…Following Refs. [34,35] we consider a mechanism for dissipation that couples each pair of states k ↑, −k ↓ with a reservoir described by a time-independent one body Hamiltonian…”

Section: A Model and Formalismmentioning

confidence: 99%

“…When considering the coupling to a reservoir, the lesser Green function satisfies the Keldysh equation in time domain [28,[32][33][34]]…”

mentioning

confidence: 99%

“…Following Refs. [34,35] we consider a mechanism for dissipation that couples each pair of states k ↑, −k ↓ with a reservoir described by a time-independent one body Hamiltonian H b = ∑ ,σ E d † σ d σ where d † σ creates a state in a single particle bath state with energy E . In the limit of a wide-band reservoir with identical coupling V k = V for each k all details of the bath dropout and its effects can be described by a single frequency independent parameter γ describing the effects of inelastic scattering and producing a level broadening ∼ γ and a finite lifetime τ = 1 γ.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Nonlinear dynamics of driven superconductors with dissipation

et al. 2020

View full text Add to dashboard Cite

We study the out-of-equilibrium dynamics of a BCS superconductor in the presence of a periodic drive with a frequency ω d larger than the equilibrium superconducting gap and an external bath providing dissipation. Similar to the dissipationless case, a subset of quasiparticles, resonant with the drive, synchronizes and produces interesting non-linear phenomena. For small dissipation Rabi-Higgs oscillations [Collado et al. Phys. Rev. B 98, 214519 (2018)] can be observed as a transient effect. At long-times in contrast, dissipation leads to a steady state with a population imbalance that increases quadratically for small drives and saturates for large drives as in non-linear quantum optics. We show also that second harmonic generation is allowed for a drive which acts on the BCS coupling constant. We also compute the intensity of time-and angle-resolved photo-emission spectroscopy (tr-ARPES) and time-resolved tunneling spectra. The excited quasiparticle population appears as a decrease (increase) in the photo-emission intensity at energy −ω d 2 (+ω d 2) measured from the chemical potential. The tunneling intensity shows a time-dependent depression at ±ω d 2 due to the lacking of spectral density and population unbalance causing Pauli blockade. We predict that at short times, compared to the energy relaxation time, both experiments will show oscillations with the Rabi-Higgs frequency. arXiv:1909.12310v1 [cond-mat.supr-con]

show abstract

“…As of now, two main approaches to study Higgs oscillations exist, namely measurements of the optical conductivity in pump-probe experiments [31][32][33] and resonances in thirdharmonic generation in periodically driven systems [34,35], where both methods allow to deduce the intrinsic Higgs modes. The only different approach, also in a pump-probe setup, was the prediction of Higgs oscillations in tr-ARPES [36][37][38], where the position of the maximum of the energy distribution curve shows oscillations with the same frequency as the Higgs mode.…”

Section: Introductionmentioning

confidence: 99%

Momentum-resolved analysis of condensate dynamic and Higgs oscillations in quenched superconductors with time-resolved ARPES

2020

View full text Add to dashboard Cite

Higgs oscillations in nonequilibrium superconductors provide a unique tool to obtain information about the underlying order parameter. Several properties like the absolute value, existence of multiple gaps, and the symmetry of the order parameter can be encoded in the Higgs oscillation spectrum. Studying Higgs oscillations with time-resolved angle-resolved photoemission spectroscopy (ARPES) has the advantage over optical measurements that a momentum-resolved analysis of the condensate dynamic is possible. In this paper, we investigate the time-resolved spectral function measured in ARPES for different quench protocols. We find that analyzing amplitude oscillations of the ARPES intensity in the whole Brillouin zone allows to understand how the condensate dynamic contributes to the emerging of collective Higgs oscillations. Furthermore, by evaluating the phase of these oscillations, the symmetry deformation dynamic of the condensate can be revealed, which gives insight about the ground state symmetry of the system. With such an analysis, time-resolved ARPES experiments might be used in the future as a powerful tool in the field of Higgs spectroscopy.

show abstract

Efficient prediction of time- and angle-resolved photoemission spectroscopy measurements on a nonequilibrium BCS superconductor

Cited by 8 publications

References 61 publications

Ultrafast Optical Control of Magnetic Order and Fermi Surface Topology at a Quantum Critical Point

Ultrafast Optical Control of Magnetic Order and Fermi Surface Topology at a Quantum Critical Point

Nonlinear dynamics of driven superconductors with dissipation

Momentum-resolved analysis of condensate dynamic and Higgs oscillations in quenched superconductors with time-resolved ARPES

Contact Info

Product

Resources

About