Apr 24 – 30, 2022
Ettore Majorana Foundation and Centre for Scientific Culture
Europe/Rome timezone

Session

A. Balandin

Apr 25, 2022, 9:00 AM
Ettore Majorana Foundation and Centre for Scientific Culture

Ettore Majorana Foundation and Centre for Scientific Culture

Via Gian Filippo Guarnotti, 26, 91016 Erice TP (Italy)

Description

Abstract:
In this lecture, I will start with an introduction consisting of a brief historical overview and the fundamental properties of the 1/f noise in metals and semiconductors. The introduction will include basic information on the noise mechanisms and sources – fluctuations in the number of carriers vs. fluctuations of the mobility, surface vs. volume effects, and approaches for studying the noise in electronic devices. In the second part of the lecture, I will describe the characteristics of 1/f noise in graphene and other quasi-two-dimensional (2D) materials and devices. Graphene and few-layer graphene constitute a convenient material platform for addressing some of the fundamental questions of the 1/f noise research field. On the other side, reduction of 1/f noise is a requirement for any practical application of 2D materials in communications or sensors [1]. The topics of discussion will include the effect of defects, introduced in a controllable way, on the 1/f noise level [2], and the use of the low-frequency noise as a signal in sensors based on graphene field-effect transistors [3]. In the third part of the lecture, I will focus on low-frequency noise in quasi-2D charge-density-wave (CDW) materials and devices. A CDW phase is a macroscopic quantum state consisting of a periodic modulation of the electronic charge density accompanied by a periodic distortion of the atomic. The CDW field experiences rebirth owing to the emergence of quasi-2D and 1D layered van der Waals materials that reveal numerous CDW phases, including some that exist above the room temperature [4-5]. I will describe the “narrow-band noise” in 2D materials, the sliding of CDWs in 1T-TaS2, and the use of low-frequency noise for monitoring the phase transitions and CDW depinning in 2D CDW quantum materials.

[1] A. A. Balandin, Nature Nano, 8, 549 (2013); [2] M. Z. Hossain, et al., Appl. Phys. Lett., 102, 153512 (2013); [3] S. Rumyantsev, et al., Nano Lett., 12, 2294 (2012); [4] G. Liu, et al., Nature Nano, 11 845 (2016); [5] A. A. Balandin, S. V. Zaitzev-Zotov, and G. Grüner, Appl. Phys. Lett., 119, 170401 (2021); [6] A. Mohammadzadeh, et al., Appl. Phys. Lett., 118, 223101 (2021).

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