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DC to GHz measurements of a near-ideal 2D material: P+ monolayers



Neil M. Zimmerman, Antonio Levy, Pradeep Namboodiri, Joshua M. Pomeroy, Xiqiao Wang, Joseph Fox, Richard M. Silver


P+ monolayers in Si are of great scientific and technological interest, both intrinsically as a material in the "ideal vacuum" of crystalline Si, and because they are showing great promise as qubits of electron and nuclear spin. The GHz complex conductivity σ(ω) can allow one to elucidate basic physical properties and also is important for fast devices, but measuring σ(ω) in 2D materials has not been easy. We report on such measurements, including showing i) qualitatively, a lack of any resonances up to 5 GHz (indicating no energy splittings below about 0.02 meV); and ii) quantitatively ideal Drude behavior of this novel material up to 5 GHz, showing a lower bound on the scattering rate of about 2×1010s−1. We also discuss deconvolving the confounding effect of the distributed resistance and capacitance of the monolayer.
AIP Advances


GHz transmission, P+ monolayer, Drude metal


Zimmerman, N. , Levy, A. , Namboodiri, P. , Pomeroy, J. , Wang, X. , Fox, J. and Silver, R. (2024), DC to GHz measurements of a near-ideal 2D material: P+ monolayers, AIP Advances, [online],, (Accessed April 19, 2024)
Created March 8, 2024, Updated March 14, 2024