2D Materials Conference 2024 | Arindam Ghosh (Indian Institute of Science, India)

Value of the Information & Strength of the Argument

The talk provides valuable insights into the use of noise spectroscopy as a complementary tool to transport measurements for probing correlated states in 2D materials. The argumentation is solid, based on experimental data and supported by theoretical collaboration. The speaker systematically builds the case for noise as a sensitive probe, from basic principles to specific observations. He acknowledges limitations, such as the absence of superconductivity in his samples, and offers plausible explanations. The presentation is well-structured and convincing.

Scientific Rigor, Source Quality, Title Accuracy

The scientific rigor is high: the speaker presents original experimental data with clear methodology, and the interpretation is grounded in established models (e.g., McWhorter model, Hooge parameter). He cites his own work and that of collaborators, but specific references are not provided in the talk. The title accurately reflects the content, focusing on low-frequency noise in heterostructures of near-MATBG and TMD layers. The talk is given at a specialized conference, indicating peer-level scrutiny.

The title accurately reflects the content: a conference talk on 2D materials, specifically focusing on low-frequency noise in twisted bilayer graphene and TMD heterostructures.

8/10

The talk is given by a leading experimental physicist at a specialized conference, presenting original research with clear methodology and data. The claims are supported by experimental evidence and theoretical collaboration, though not peer-reviewed in this format.

Markers derived by PSI from the transcript: the creator did not define chapters.

• 00:00Introduction: motivation for using noise as a probe.
• 02:00Basics of 1/f noise and its measurement challenges.
• 05:00Origin of 1/f noise in graphene devices: charge trapping and McWhorter model.
• 08:00Comparison of noise in graphene on BN vs SiO2, and contact effects.
• 10:00Noise in twisted bilayer graphene: lower noise near magic angle, Hooge parameter.
• 12:00Observation of random telegraphic signals near Moiré gap at low temperature.
• 14:00Interpretation as generation-recombination noise from BN defects.
• 16:00Using noise to detect correlated states: dips at fractional fillings.
• 18:00Noise in TBG/TMD heterostructures: new states at half-integer fillings.
• 20:00Summary and Q&A session.

• Noise in graphene and 2D materials (attocube webinar description) — Description of the talk and key aspects.

• Correlated insulator behaviour at half-filling in magic-angle graphene superlattices — Seminal paper on correlated states in TBG, supporting the existence of correlated phases.

• Superconductivity in magic-angle graphene — The speaker notes the absence of superconductivity in his samples, contrasting with other reports.