D. M. Basko

Centre National de la Recherche Scientifique

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Andrea C. Ferrari

University of Cambridge

Nicola Marzari

École Polytechnique Fédérale de Lausanne

A. Bonetti

University of Cambridge

Costas Galiotis

University of Patras

Tariq Mohiuddin

Sultan Qaboos University

E. M. Conwell

University of Rochester

R. Jalil

University of Manchester

Antonio Lombardo

University College London

A. K. Geǐm

Henry Royce Institute

Gianluigi Catelani

Forschungszentrum Jülich

Cooperative Institutions

Centre National de la Recherche Scientifique

University of Cambridge

University of Manchester

University of Warsaw

Université Grenoble Alpes

Laboratoire National des Champs Magnétiques Intenses

Henry Royce Institute

Warsaw University of Technology

Université de Toulouse

Institut National des Sciences Appliquées de Toulouse

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Bilayer graphene inclusions in rotational-stacked multilayer epitaxial graphene

HAL (Le Centre pour la Communication Scientifique Directe) (2011)

M. Orlita C. Faugeras J. Borysiuk J. M. Baranowski Włodek Strupiński

Bilayer graphene

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Dissipation in a superconducting artificial atom due to a single nonequilibrium quasiparticle

Physical review. B./Physical review. B (2017)

Nguyễn Văn Duy Gianluigi Catelani D. M. Basko

We study a superconducting artificial atom which is represented by a single Josephson junction or a Josephson junction chain, capacitively coupled to a coherently driven transmission line, and which contains exactly one residual quasiparticle (or less than one quasiparticle per island in a chain). We study the dissipation in the atom induced by the quasiparticle tunneling, taking into account the quasiparticle heating by the drive. We calculate the transmission coefficient in the transmission line for drive frequencies near resonance and show that, when the artificial atom spectrum is nearly harmonic, the intrinsic quality factor of the resonance increases with the drive power. This counterintuitive behavior is due to the energy dependence of the quasiparticle density of states.

10.1103/physrevb.96.214508

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Citations (7)

Erratum: Effect of inelastic collisions on multiphonon Raman scattering in graphene [Phys. Rev. B76, 081405(R) (2007)]

Physical Review B (2009)

D. M. Basko

10.1103/physrevb.79.209903

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Calculation of the RamanGpeak intensity in monolayer graphene: role of Ward identities

New Journal of Physics (2009)

D. M. Basko

The absolute integrated intensity of the single-phonon Raman peak at 1580 cm−1 is calculated for a clean graphene monolayer. The resulting intensity is determined by the trigonal warping of the electronic bands and the anisotropy of the electron–phonon coupling, and is proportional to the second power of the excitation frequency. The main contribution to the process comes from the intermediate electron-hole states with typical energies of the order of the excitation frequency, contrary to what has been reported earlier. This occurs because of strong cancellations between different terms of the perturbation theory, analogous to Ward identities in quantum electrodynamics.

Image warping

Intensity

10.1088/1367-2630/11/9/095011

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Theory of resonant multiphonon Raman scattering in graphene

Physical Review B (2008)

D. M. Basko

We present a detailed calculation of intensities of two-phonon and four-phonon Raman peaks in graphene. Writing the low-energy Hamiltonian of the interaction of electrons with the crystal vibrations and the electromagnetic field from pure symmetry considerations, we describe the system in terms of just a few independent coupling constants, considered to be parameters of the theory. The electron-scattering rate is introduced phenomenologically as another parameter. The results of the calculation are used to extract information about these parameters from the experimentally measured Raman peak intensities. In particular, the Raman intensities are sensitive to the electron-scattering rate, which is not easy to measure by other techniques. Also, the Raman intensities depend on electron-phonon coupling constants; to reproduce the experimental results, one has to take into account renormalization of these coupling constants by electron-electron interaction.

Coupling constant

Hamiltonian (control theory)

10.1103/physrevb.78.125418

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Citations (199)

Local nature and scaling of chaos in weakly nonlinear disordered chains

Physical Review E (2012)

D. M. Basko

The dynamics of a disordered nonlinear chain can be either regular or chaotic with a certain probability. The chaotic behavior is often associated with the destruction of Anderson localization by the nonlinearity. In the presentwork it is argued that at weak nonlinearity chaos is nucleated locally on rare resonant segments of the chain. Based on this picture, the probability of chaos is evaluated analytically. The same probability is also evaluated by direct numerical sampling of disorder realizations and quantitative agreement between the two results is found.

Chain (unit)

10.1103/physreve.86.036202

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Citations (19)

On the local nature and scaling of chaos in weakly nonlinear disordered chains

HAL (Le Centre pour la Communication Scientifique Directe) (2012)

D. M. Basko

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Theory of electron spin resonance in bulk topological insulators Bi₂Se₃, Bi₂Te₃and Sb₂Te₃

Journal of Physics Condensed Matter (2016)

Ousmane Ly D. M. Basko

We report a theoretical study of electron spin resonance in bulk topological insulators, such as Bi2Se3, Bi2Te3 and Sb2Te3. Using the effective four-band model, we find the electron energy spectrum in a static magnetic field and determine the response to electric and magnetic dipole perturbations, represented by oscillating electric and magnetic fields perpendicular to the static field. We determine the associated selection rules and calculate the absorption spectra. This enables us to separate the effective orbital and spin degrees of freedom and to determine the effective g factors for electrons and holes.

Topological insulator

10.1088/0953-8984/28/15/155801

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Electron-electron interactions and doping dependence of the two-phonon Raman intensity in graphene

Physical Review B (2009)

D. M. Basko S. Piscanec Andrea C. Ferrari

Raman spectroscopy is a fast and nondestructive means to characterize graphene samples. In particular, the Raman spectra are strongly affected by doping. While the resulting change in position and width of the $G$ peak can be explained by the nonadiabatic Kohn anomaly at $\ensuremath{\Gamma}$, the significant doping dependence of the $2D$ peak intensity has not been understood yet. Here we show that this is due to a combination of electron-phonon and electron-electron scattering. Under full resonance, the photogenerated electron-hole pairs can scatter not just with phonons but also with doping-induced electrons or holes, and this changes the intensity. We explain the doping dependence and show how it can be used to determine the corresponding electron-phonon coupling. This is higher than predicted by density-functional theory, as a consequence of renormalization by Coulomb interactions.

10.1103/physrevb.80.165413

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Citations (438)

Report on scipost_201811_00008v1

Gianluigi Catelani D. M. Basko

We study the effect of non-equilibrium quasiparticles on the operation of a superconducting device (a qubit or a resonator), including heating of the quasiparticles by the device operation.Focusing on the competition between heating via low-frequency photon absorption and cooling via photon and phonon emission, we obtain a remarkably simple non-thermal stationary solution of the kinetic equation for the quasiparticle distribution function.We estimate the influence of quasiparticles on relaxation and excitation rates for transmon qubits, and relate our findings to recent experiments.

10.21468/scipost.report.719

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