## Abstract

Recently, Mott-insulating heterostructures have been proposed as

candidates for highly efficient solar cells [1]. Here, photoexcited

doublons and holes act as charge carriers which can proliferate due to impact ionisation processes [2].

Previous works have investigated the doublon dynamics in such systems within

time-dependent Dynamical Mean-Field Theory (DMFT) by looking at the time evolution after a photoexcitation [3].

In the present work we focus on the (quasi-) steady state of

periodically driven quantum systems. Specifically, we implement an

algorithm to deal with periodic steady states of strongly correlated

systems, making use of the nonequilibrium Floquet Green's function

formalism within the DMFT approximation.

Our model consists of a correlated layer subject to a periodic driving

via a homogeneous electric field and coupled to leads with different

chemical potentials.

We present results obtained with a Floquet DMFT implementation using the

Auxiliary Master Equation Approach (AMEA) [4] as an impurity solver.

AMEA is based upon mapping the system to an open quantum system

described by a Lindblad Master Equation. This allows the impurity to be

affected by short-ranged non-Markovian dynamics.

For comparison, we also carry out calculations on the same model within iterated perturbation

theory [5]

[1] E. Manousakis, Phys. Rev. B, 82, 125109, (2010); E.Assman et al., Phys. Rev. Lett. 110, 078701 (2013)

[2] J.Coulter et al., Phys. Rev. B, 90,165142 (2014)

[3] M.Eckstein and P. Werner, Phys. Rev. Lett., 113, 076405 (2014); P. Werner et al., Phys. Rev. B 90, 235102 (2014)

[4] E. Arrigoni et al., Phys. Rrev. Lett., 110, 086403 (2013); I. Titvinidze et al., Phys. Rev. B, 92, 245125 (2015)

[5] A. Joura et al., Phys Rrev. B, 91, 245153 (2015)

candidates for highly efficient solar cells [1]. Here, photoexcited

doublons and holes act as charge carriers which can proliferate due to impact ionisation processes [2].

Previous works have investigated the doublon dynamics in such systems within

time-dependent Dynamical Mean-Field Theory (DMFT) by looking at the time evolution after a photoexcitation [3].

In the present work we focus on the (quasi-) steady state of

periodically driven quantum systems. Specifically, we implement an

algorithm to deal with periodic steady states of strongly correlated

systems, making use of the nonequilibrium Floquet Green's function

formalism within the DMFT approximation.

Our model consists of a correlated layer subject to a periodic driving

via a homogeneous electric field and coupled to leads with different

chemical potentials.

We present results obtained with a Floquet DMFT implementation using the

Auxiliary Master Equation Approach (AMEA) [4] as an impurity solver.

AMEA is based upon mapping the system to an open quantum system

described by a Lindblad Master Equation. This allows the impurity to be

affected by short-ranged non-Markovian dynamics.

For comparison, we also carry out calculations on the same model within iterated perturbation

theory [5]

[1] E. Manousakis, Phys. Rev. B, 82, 125109, (2010); E.Assman et al., Phys. Rev. Lett. 110, 078701 (2013)

[2] J.Coulter et al., Phys. Rev. B, 90,165142 (2014)

[3] M.Eckstein and P. Werner, Phys. Rev. Lett., 113, 076405 (2014); P. Werner et al., Phys. Rev. B 90, 235102 (2014)

[4] E. Arrigoni et al., Phys. Rrev. Lett., 110, 086403 (2013); I. Titvinidze et al., Phys. Rev. B, 92, 245125 (2015)

[5] A. Joura et al., Phys Rrev. B, 91, 245153 (2015)

Originalsprache | englisch |
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Publikationsstatus | Veröffentlicht - 21 Okt 2016 |

Veranstaltung | ViCoM Fall Workshop 2016 - Oskar- Morgenstern -Platz 1 (Sky Lounge), Vienna, Österreich Dauer: 20 Okt 2016 → 21 Okt 2016 https://www.wpi.ac.at/themedata/vicom_WS |

### Konferenz

Konferenz | ViCoM Fall Workshop 2016 |
---|---|

Land | Österreich |

Ort | Vienna |

Zeitraum | 20/10/16 → 21/10/16 |

Internetadresse |

## Fields of Expertise

- Advanced Materials Science