Creating stable Floquet–Weyl semimetals by laser-driving of 3D Dirac materials

Hübener, Hannes; Sentef, Michael A.; Giovannini, Umberto De; Kemper, A. F.; Rubio, Ángel

doi:10.1038/ncomms13940

Cited by 332 publications

(240 citation statements)

References 61 publications

Supporting

Mentioning

237

Contrasting

Unclassified

Order By: Relevance

“…To obtain the electronic structure underlying the bands observed in the photoemission spectrum we use Floquet analysis of the time-dependent Hamiltonian generated by the TDDFT calculation. 95 In this method a stationary state is expanded action between sidebands (see for instance Supplementary Fig. S2).…”

Section: Resultsmentioning

confidence: 99%

“…[84][85][86][87][88][89] However, recently there has been considerable activity in the theoretical framework of Floquet-theory for light-driven matter following the proposal of the Floquet topological insulator. [90][91][92][93][94][95] The Floquet-phonon framework proposed here can be used as a paradigm to treat vibrationally excited systems and is thus for example also applicable for shaken optical lattices, where instead of a phonon mode a macroscopic vibration is applied. 96 It is equally applicable to the interpretation of vibrational spectroscopy in molecules, where the phonon-dressed sidebands occur as a series of vibrational peaks.…”

Section: -83mentioning

confidence: 99%

See 1 more Smart Citation

Phonon Driven Floquet Matter

2018

Self Cite

View full text Add to dashboard Cite

The effect of electron-phonon coupling in materials can be interpreted as a dressing of the electronic structure by the lattice vibration, leading to vibrational replicas and hybridization of electronic states. In solids a resonantly excited coherent phonon leads to a periodic oscillation of the atomic lattice in a crystal structure bringing the material into a non-equilibrium electronic configuration. Periodically oscillating quantum systems can be understood in terms of Floquet theory, which has a long tradition in the study of semi-classical light-matter interaction. Here, weshow that the concepts of Floquet analysis can be applied to coherent lattice vibrations reflecting the underlying coupling mechanism between electrons and coherent bosonic modes. This coupling leads to phonon-or photon-dressed quasi-particles imprinting specific signatures in the spectrum of the electronic structure. Such dressed electronic states can be detected by time-and angularresolved photoelectron spectroscopy (ARPES) manifesting as sidebands to the equilibrium band structure. Taking graphene as a paradigmatic material with strong electron-phonon interaction and non-trivial topology we show how the phonon-dressed states display an intricate sideband structure revealing the electron-phonon coupling at the Brillouin zone center and topological ordering of the Dirac bands. Most strikingly, we find that the non-equilibrium electronic structure created by coherent dynamical dressing is the same for photon and phonon perturbations. We demonstrate that if time-reversal symmetry is broken by the coherent lattice perturbations a topological phase transition can be induced. This work establishes that the recently demonstrated concept of lightinduced non-equilibrium Floquet phases can also be applied when using coherent phonon modes for the dynamical control of material properties. The present results are generic for bosonic timedependent perturbations, therefore we envision similar phenomena to be observed for example for plasmon, magnon or exciton driven materials.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: -83mentioning

confidence: 99%

Phonon Driven Floquet Matter

2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…Although this strategy has yet to be experimentally demonstrated in condensed-matter systems, theoretical progress is being made at a rapid pace. Dynamical engineering protocols for manipulating Berry curvatures in Dirac systems 146 , transforming trivial materials into Floquet topological insulators 5,6,130 , p-wave superconductors 147 , Weyl semimetals 145,148 , chiral spin liquids 149 and quantum Hall phases without external magnetic fields 4,68,149 , eagerly await experimental implementation. These endeavours will draw heavily from knowledge accumulated in the cold-atom and molecule community and forge greater synergy with condensed-matter physics.…”

Section: Topological Phenomena Under Controlmentioning

confidence: 99%

Towards properties on demand in quantum materials

2017

View full text Add to dashboard Cite

Q uantum materials are on the ascent. This term embodies a vast portfolio of compounds and phenomena where ramifications of quantum mechanics are demonstrably real. Quantum materials are in the vanguard of contemporary physics in part because these systems afford an exceptional venue to uncover the many roles of symmetry, topology, dimensionality and strong correlations in macroscopic observables. Here we set out to explore the ways and means of creating new states of matter in quantum materials and manipulating their phases via external stimuli. Practical control of these properties is a precondition for exploiting quantum advantages in new photonic, electronic and energy technologies, a task of significant societal impact 1 . We will primarily focus on the following classes of quantum materials: transition metal oxides, Fe-and Cu-based high-T c superconductors, van der Waals semiconductors, topological insulators and Weyl semimetals, and, finally, graphene.The properties of quantum materials are anomalously sensitive to external stimuli. In these systems, interactions associated with spin, charge, lattice and orbital degrees of freedom are commonly on par with the electronic kinetic energy. A rather fragile balance between coexisting and competing ground states can be readily shifted via external stimuli, leading to a raft of quantum phases and transitions between them 2,3 . Furthermore, certain classes of driven quantum states (Fig. 1a and Box 1) are explicit products of coherent interaction between light and matter 4-6 . Alternatively, the properties of quantum materials can be pre-programmed by directly manipulating the electronic wavefunction and the attendant Berry phase that give rise to the anomalous velocity of electrons in a solid [7][8][9] . These complementary avenues of controls mean that investigations no longer need to be reduced to merely observing (in contrast, for example, to astrophysics). Instead, it is now feasible to attain, in a predictable fashion, 'properties on demand' by steering a quantum material towards a desirable ground, metastable or transient state. The past decade has witnessed an explosion in the field of quantum materials, headlined by the predictions and discoveries of novel Landau-symmetry-broken phases in correlated electron systems, topological phases in systems with strong spin-orbit coupling, and ultra-manipulable materials platforms based on two-dimensional van der Waals crystals. Discovering pathways to experimentally realize quantum phases of matter and exert control over their properties is a central goal of modern condensed-matter physics, which holds promise for a new generation of electronic/photonic devices with currently inaccessible and likely unimaginable functionalities. In this Review, we describe emerging strategies for selectively perturbing microscopic interaction parameters, which can be used to transform materials into a desired quantum state. Particular emphasis will be placed on recent successes to tailor electronic interaction parameters through th...

show abstract

“…The observation of such oscillations could be a direct proof of the existence of the chiral nodes, but since the momentum separation of the chiral nodes remains fixed for a given material, it is not likely to be usable as a tuning parameter. On the other hand, it has also been understood recently how time periodic perturbations can affect the WSM [37][38][39][40][41][42] , and in particular, how a high frequency incident elliptically polarized light can slightly modify the position of the effective chiral nodes of the WSM 43 . This provides the possibility that the external parameters controlling the perturbation can serve as tuning parameters in adjusting the separation of the chiral nodes.…”

mentioning

confidence: 99%

0−π transitions in a Josephson junction of an irradiated Weyl semimetal

2017

View full text Add to dashboard Cite

We propose a setup for the experimental realization of anisotropic 0-π transitions of the Josephson current, in a junction whose link is made of irradiated Weyl semi-metal (WSM), due to the presence of chiral nodes. The Josephson current through a time-reversal symmetric WSM has anisotropic (with respect to the orientation of the chiral nodes) periodic oscillations as a function of k0L, where k0 is the (relevant) separation of the chiral nodes and L is the length of the sample. We then show that the effective value of k0 can be tuned with precision by irradiating the sample with linearly polarized light, which does not break time-reversal invariance, resulting in 0-π transitions of the critical current. We also discuss the feasibility and robustness of our setup.

show abstract

Creating stable Floquet–Weyl semimetals by laser-driving of 3D Dirac materials

Cited by 332 publications

References 61 publications

Phonon Driven Floquet Matter

Phonon Driven Floquet Matter

Towards properties on demand in quantum materials

0−π transitions in a Josephson junction of an irradiated Weyl semimetal

Contact Info

Product

Resources

About