Employing the quantum Liouville equation with phenomenological dissipation, we investigate the transport properties of massless and massive Dirac fermion systems that mimics graphene and topological insulators, respectively. The massless Dirac fermion system does not show an intrinsic Hall effect, but it shows a Hall current under the presence of circularly-polarized laser fields as a nature of a optically-driven nonequilibrium state. Based on the microscopic analysis, we find that the light-induced Hall effect mainly originates from the imbalance of photocarrier distribution in momentum space although the emergent Floquet-Berry curvature also has a non-zero contribution. We further compute the Hall transport property of the massive Dirac fermion system with an intrinsic Hall effect in order to investigate the interplay of the intrinsic topological contribution and the extrinsic light-induced population contribution. As a result, we find that the contribution from the photocarrier population imbalance becomes significant in the strong field regime and it overcomes the intrinsic contribution. This finding clearly demonstrates that intrinsic transport properties of materials can be overwritten by external driving and may open a way to ultrafast optical-control of transport properties of materials.

S A Sato, P Tang, M A Sentef, Umberto De Giovannini, H Hübener, A Rubio (2019). Light-induced anomalous Hall effect in massless Dirac fermion systems and topological insulators with dissipation. NEW JOURNAL OF PHYSICS, 21(9), 093005 [10.1088/1367-2630/ab3acf].

Light-induced anomalous Hall effect in massless Dirac fermion systems and topological insulators with dissipation

Umberto De Giovannini;
2019-09-04

Abstract

Employing the quantum Liouville equation with phenomenological dissipation, we investigate the transport properties of massless and massive Dirac fermion systems that mimics graphene and topological insulators, respectively. The massless Dirac fermion system does not show an intrinsic Hall effect, but it shows a Hall current under the presence of circularly-polarized laser fields as a nature of a optically-driven nonequilibrium state. Based on the microscopic analysis, we find that the light-induced Hall effect mainly originates from the imbalance of photocarrier distribution in momentum space although the emergent Floquet-Berry curvature also has a non-zero contribution. We further compute the Hall transport property of the massive Dirac fermion system with an intrinsic Hall effect in order to investigate the interplay of the intrinsic topological contribution and the extrinsic light-induced population contribution. As a result, we find that the contribution from the photocarrier population imbalance becomes significant in the strong field regime and it overcomes the intrinsic contribution. This finding clearly demonstrates that intrinsic transport properties of materials can be overwritten by external driving and may open a way to ultrafast optical-control of transport properties of materials.
4-set-2019
Settore FIS/03 - Fisica Della Materia
S A Sato, P Tang, M A Sentef, Umberto De Giovannini, H Hübener, A Rubio (2019). Light-induced anomalous Hall effect in massless Dirac fermion systems and topological insulators with dissipation. NEW JOURNAL OF PHYSICS, 21(9), 093005 [10.1088/1367-2630/ab3acf].
File in questo prodotto:
File Dimensione Formato  
Light-induced anomalous Hall effect in massless Dirac fermion systems and topological insulators with dissipation.pdf

accesso aperto

Tipologia: Versione Editoriale
Dimensione 908.87 kB
Formato Adobe PDF
908.87 kB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10447/568784
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus ND
  • ???jsp.display-item.citation.isi??? 33
social impact