Speaker
Silvan Roth
(EPFL)
Description
Black phosphorus (BP) consists of a layered puckered structure of P atoms in a hexagonal arrangement, with outstanding optical, [1] electrical [2] and thermal properties [3].
Unlike his carbon counterpart graphene, it exhibits a thickness-dependent electronic band gap, spanning from 2 eV for phosphorene (single layer) down to 0.33 eV for bulk BP.
Our trARPES experiment now shows that the electronic structure of BP undergoes dramatic transient changes, namely a complete or almost complete gap closure, when the system is excited by an ultrafast IR pulse.
[1] Jia, Y. et al., Nat. Commun., 5, 1–6 (2014)
[2] Li L. et al., Nat. Nanotec., 9, 372–377 (2014)
[3] Luo, Z. et. al., Nat. Commun., 6, 8572 (2015)
Authors
Silvan Roth
(EPFL)
Alberto Crepaldi
(EPFL)
Gianmarco Gatti
(EPFL)
Mr
Michele Puppin
(EPFL)
Prof.
Majed Chergui
(EPFL-SB-ISIC-LSU)
Prof.
Marco Grioni
(EPFL)
