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TT: Fachverband Tiefe Temperaturen

TT 12: Fluctuations and Noise

TT 12.1: Vortrag

Montag, 18. März 2024, 15:00–15:15, H 3007

Full counting statistics of ultrafast quantum transport — •Matthias Hübler and Wolfgang Belzig — Universität Konstanz, D-78457 Konstanz, Germany

Quantum transport in the presence of time-dependent drives is dominated by quantum interference and many-body effects at low temperatures. For a periodic driving, the analysis of the full counting statistics revealed the elementary events that determine the statistical properties of the charge transport. However, so far only continuous wave excitations were considered, but recently transport by few-cycle light pulses were investigated [1] and the need for a statistical interpretation became eminent. We investigate the temporal dynamics of single- or few-cycle light pulses leaving traces in the charge transfer. The fingerprints of these time-dependent voltage pulses are imprinted in the full counting statistics of a coherent mesoscopic conductor at zero temperature. In addition, we identify the elementary processes that occur in the form of electron-hole pair creations, which can be investigated by the excess noise. We study the differential noise quantum oscillations induced by a wave packet consisting of an oscillating carrier modulated by a Gaussian- or a box-shaped envelope. As expected, the differential noise exhibits an oscillatory behavior with increasing amplitude. We find clear signature of the so-called carrier-envelope phase in the peak heights and positions of these quantum oscillations.

[1] T. Rybka, M. Ludwig, M. F. Schmalz, V. Knittel, D. Brida, A. Leitenstorfer, Nat. Photonics 10 (2016) 667.

[2] M. Hübler, W. Belzig; Appl. Phys. Lett. 17 (2023) 123 (3): 034006.

Keywords: Full counting statistics; Shot noise; Single-cycle pulses; Photon-assisted processes