RT Journal Article
T1 Floquet engineering of Dirac cones on the surface of a topological insulator
A1 Díaz Fernández, Álvaro
A1 Díaz García, Elena
A1 Gómez León, Álvaro
A1 Platero, G.
A1 Domínguez-Adame Acosta, Francisco
AB We propose to Floquet engineer Dirac cones at the surface of a three-dimensional topological insulator. We show that a large tunability of the Fermi velocity can be achieved as a function of the polarization, direction, and amplitude of the driving field. Using this external control, the Dirac cones in the quasienergy spectrum may become elliptic or massive, in accordance with experimental evidence. These results help us to understand the interplay of surface states and external ac driving fields in topological insulators. In our work we use the full Hamiltonian for the three-dimensional system instead of effective surface Hamiltonians, which are usually considered in the literature. Our findings show that the Dirac cones in the quasienergy spectrum remain robust even in the presence of bulk states, and therefore, they validate the usage of effective surface Hamiltonians to explore the properties of Floquet-driven topological boundaries. Furthermore, our model allows us to introduce out-of-plane field configurations which cannot be accounted for by effective surface Hamiltonians.
PB American Physical Society
SN 2469-9950
YR 2019
FD 2019-08-06
LK https://hdl.handle.net/20.500.14352/13654
UL https://hdl.handle.net/20.500.14352/13654
LA eng
NO ©2019 American Physical SocietyThe authors thank P. Rodriguez for very enlightening discussions. This research was supported by MINECO (Grants No. MAT2016-75955 and No. MAT2017-86717-P). A.D.-F. acknowledges support from the UCM-Santander Program (Grant No. CT27/16-CT28/16), and A.G.-L. acknowledges the Juan de la Cierva program. A.G.-L. and G.P. acknowledge support from the CSIC Research Platform PTI-001.
NO Ministerio de Economia y Competitividad (MINECO)
NO Universidad Complutense de Madrid/Banco de Santander
NO Consejo Superior de Investigaciones Científicas (CSIC)
DS Docta Complutense
RD 17 ago 2024