visitant ::
identificació
|
|||||||||||||||
Cerca | Lliura | Ajuda | Servei de Biblioteques | Sobre el DDD | Català English Español |
Pàgina inicial > Articles > Articles publicats > Experimental Demonstration of a Magnetically Induced Warping Transition in a Topological Insulator Mediated by Rare-Earth Surface Dopants |
Data: | 2023 |
Resum: | Magnetic topological insulators constitute a novel class of materials whose topological surface states (TSSs) coexist with long-range ferromagnetic order, eventually breaking time-reversal symmetry. The subsequent bandgap opening is predicted to co-occur with a distortion of the TSS warped shape from hexagonal to trigonal. We demonstrate such a transition by means of angle-resolved photoemission spectroscopy on the magnetically rare-earth (Er and Dy) surface-doped topological insulator BiSeTe. Signatures of the gap opening are also observed. Moreover, increasing the dopant coverage results in a tunable p-type doping of the TSS, thereby allowing for a gradual tuning of the Fermi level toward the magnetically induced bandgap. A theoretical model where a magnetic Zeeman out-of-plane term is introduced in the Hamiltonian governing the TSS rationalizes these experimental results. Our findings offer new strategies to control magnetic interactions with TSSs and open up viable routes for the realization of the quantum anomalous Hall effect. |
Ajuts: | Agencia Estatal de Investigación PID2020-116181RB-C31 European Commission 824140 Ministerio de Economía y Competitividad SPGC2018-098613-B-C21 Ministerio de Economía y Competitividad EQC2019-006304-P Ministerio de Ciencia e Innovación PID2021-123776NB-C21 Ministerio de Economía y Competitividad SEV-2017-0706 Agencia Estatal de Investigación PID2019-111773RB-I00 Agencia Estatal de Investigación PID2019-107338RB-C65 Ministerio de Ciencia e Innovación CEX2020-001039-S Agencia Estatal de Investigación CEX2018-000805-M European Commission 881603 |
Drets: | Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, i la comunicació pública de l'obra, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original. No es permet la creació d'obres derivades. |
Llengua: | Anglès |
Document: | Article ; recerca ; Versió publicada |
Matèria: | Magnetic topological insulators ; Rare-earth doping ; Topological surface state ; Time-reversal symmetry breaking ; Angle-resolved photoemission spectroscopy ; Quantum anomalous Hall effect |
Publicat a: | Nano letters, Vol. 23, Issue 13 (July 2023) , p. 6249-6258, ISSN 1530-6992 |
10 p, 5.6 MB |