ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT wigner.hun-ren.hu>]

PhD Preliminary DefenseFehér BeatrixHUN-REN Wigner RCP 
SZFILaser-Field-Controlled Ultrafast Currents in MetalsTuesday, 20 January 
2026, 10:00, KFKI Campus, Bldg. 1, 2nd floor, Conference RoomStrong-field 
interaction with solid-state matter is a promising cornerstone for future 
optoelectronics, potentially enabling operations in the PHz frequency domain. 
When few-cycle laser pulses interact with solid materials just below their 
damage threshold, a variety of fascinating phenomena emerge, including 
nonlinear effects, photoemission, high harmonic generation, or the generation 
of oriented currents. Ultrafast, carrier-envelope phase (CEP)-dependent 
currents have been observed in a wide range of media, spanning graphene, 
semiconductors and dielectrics. In this presentation, I report on the 
detection of light-field-driven currents generated in ultrathin metal layers 
incorporated into heterostructures [1]. Our measurements support the 
conjecture that the transfer of current from the medium to the electrodes is 
non-local and quasi-instantaneous, implying that physical carrier transport 
is not required. To explain this behavior, the Ramo–Shockley theorem was 
invoked [1,2]. Additionally, the current generated this way is stable enough 
to be utilized in an on-chip 500-nm-resolution, 3D CEP scanner [3].[1] B. 
Fehér, V. Hanus, W. Li, Z. Pápa, J. Budai, P. Paul, A. Szeghalmi, Z. Wang, M. 
F. Kling, and P. Dombi, Light field–controlled PHz currents in intrinsic 
metals, Sci. Adv. 11, eadv5406 (2025).[2] V. Hanus, B. Fehér, Z. Pápa, J. 
Budai, P. Paul, A. Szeghalmi, and P. Dombi, Non-Local Transfer of Ultrafast 
Currents Generated by Laser Pulses, Phys. Rev. Lett., manuscript under review 
(2025).[3] V. Hanus, B. Fehér, V. Csajbók, P. Sándor, Z. Pápa, J. Budai, Z. 
Wang, P. Paul, A. Szeghalmi, and P. Dombi, Carrier-envelope phase on-chip 
scanner and control of laser beams, Nat. Commun. 14, 5068 (2023). 
 Minden érdeklődőt szívesen látunk! - Everyone is welcome to 
attend.Attila Nagysem-admin AT wigner.hun-ren.hu