Continuous-time Monte Carlo methods for quantum impurity models
- E. Gull, A. Millis, A. Lichtenstein, A. Rubtsov, M. Troyer, P. Werner
- Physics
- 20 December 2010
Quantum impurity models describe an atom or molecule embedded in a host material with which it can exchange electrons. They are basic to nanoscience as representations of quantum dots and molecular…
Continuous-time quantum Monte Carlo method for fermions: Beyond auxiliary field framework
- A. Rubtsov, A. Lichtenstein
- Physics
- 31 July 2004
A numerically exact continuous-time quantum Monte Carlo algorithm for finite fermionic systems with nonlocal interactions is proposed. The scheme is particularly applicable for general multiband…
High-harmonic spectroscopy of ultrafast many-body dynamics in strongly correlated systems
- R. E. F. Silva, I. Blinov, A. Rubtsov, O. Smirnova, M. Ivanov
- Physics
- 27 April 2017
We bring together two topics that, until now, have been the focus of intense but non-overlapping research efforts. The first concerns high-harmonic generation in solids, which occurs when an intense…
Attosecond spectral singularities in solid-state high-harmonic generation
- A. J. Uzan, G. Orenstein, N. Dudovich
- PhysicsNature Photonics
- 20 January 2020
Strong-field-driven electric currents in condensed-matter systems are opening new frontiers in petahertz electronics. In this regime, new challenges are arising as the roles of band structure and…
Renormalization group approach to the Fröhlich polaron model: application to impurity-BEC problem
- F. Grusdt, Y. Shchadilova, A. Rubtsov, E. Demler
- PhysicsScientific Reports
- 8 October 2014
A renormalization group approach for analyzing a paradigmatic model of polarons, the so-called Fröhlich model, is developed and applied to a problem of impurity atoms immersed in a Bose-Einstein condensate of ultra cold atoms, finding a smooth crossover from weak to strong coupling regimes.
Dual fermion approach to nonlocal correlations in the Hubbard model
- A. Rubtsov, M. Katsnelson, A. Lichtenstein
- Physics
- 7 December 2006
A diagrammatic technique is developed to describe nonlocal effects (e.g., pseudogap formation) in the Hubbard-like models. In contrast to cluster approaches, this method utilizes an exact transition…
DC-ELECTRIC-FIELD-INDUCED AND LOW-FREQUENCY ELECTROMODULATION SECOND-HARMONIC GENERATION SPECTROSCOPY OF SI(001)-SIO2 INTERFACES
- O. Aktsipetrov, A. A. Fedyanin, Usa
- Physics
- 3 May 1998
The mechanism of dc-electric-field-induced second-harmonic ~EFISH! generation at weakly nonlinear buried Si(001)-SiO2 interfaces is studied experimentally in planar Si(001)-SiO 2-Cr MOS structures by…
Dual fermion approach to the two-dimensional Hubbard model: Antiferromagnetic fluctuations and Fermi arcs
- A. Rubtsov, M. Katsnelson, A. Lichtenstein, A. Georges
- Physics
- 21 October 2008
We present an efficient diagrammatic method to describe nonlocal correlation effects in lattice fermion Hubbard-type models, which is based on a change of variables in the Grassmann path integrals.…
Plasmons in strongly correlated systems: spectral weight transfer and renormalized dispersion.
- E. van Loon, H. Hafermann, A. Lichtenstein, A. Rubtsov, M. Katsnelson
- PhysicsPhysical Review Letters
- 24 June 2014
The calculated plasmon spectra are qualitatively different from those in the random-phase approximation: they exhibit a spectral density transfer and a renormalized dispersion with enhanced deviation from the canonical √q behavior.
Competing phases of the Hubbard model on a triangular lattice: Insights from the entropy
- Gang Li, A. Antipov, A. Rubtsov, S. Kirchner, W. Hanke
- Physics
- 21 November 2012
Based on the ladder dual-fermion approach, we present a comprehensive study of the phases of the isotropic Hubbard model on the triangular lattice. We find a rich phase diagram containing most of the…
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