A graphene/h-BN MEMS varactor for sub-THz and THz applications

Dróżdż, Piotr A.; Haras, Maciej; Przewłoka, Aleksandra; Krajewska, Aleksandra; Filipiak, Maciej; Słowikowski, Mateusz; Stonio, Bartłomiej; Czerniak-Łosiewicz, Karolina; Mierczyk, Zygmunt; Skotnicki, T.; Lioubtchenko, Dmitri

doi:10.1039/d2nr06863j

Nanoscale

2023

DOI: 10.1039/d2nr06863j

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A graphene/h-BN MEMS varactor for sub-THz and THz applications

Piotr A. Dróżdż

Maciej Haras

Aleksandra Przewłoka

et al.

Abstract: A mm-size graphene suspended varactor was prepared and characterized. It can be combined with a dielectric rod waveguide to construct a sub-THz phase shifter.

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2024

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Size dependence of melting process of armchair hexagonal boron nitride nanoribbon

Nguyen,

Tran,

Ngo

2024

Comm. Phys.

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The dependence on the initial configuration size of armchair hexagonal boron nitride nanoribbon (h-BNNR) is investigated by molecular dynamics simulation. The initial configuration size of armchair h-BNNR containing 10000, 20000, and 30000 identical atoms of B and N is heated from 50 K to 6000 K via Tersoff potentials to study the dependence on the initial configuration size of the phase transition from crystal to liquid of armchair h-BNNR. Some results can be listed: the phase transition exhibits a first-order type; the phase transition from crystal to liquid states depends on the initial configuration size; the melting points of 10000, 20000, and 30000 atoms are 3640 K, 4000 K, and 4400 K, respectively; the dependence on the heating rate of the armchair h-BNNR is considered for the case of 20000 atoms; in this study range, the melting point decreases as the heating rate decreases; the atomic mechanism of melting process is studied by analyzing the parameter and the appearance of the liquid-like atoms based on the critical value ; the critical value is used to classify solid-like and liquid-like atoms; the appearance of liquid-like atoms upon heating starts from the edges and grow inward; at the phase transition temperature, almost the entire crystal structure of the armchair h-BNNR configuration collapses.

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Size dependence of melting process of armchair hexagonal boron nitride nanoribbon

Nguyen,

Tran,

Ngo

2024

Comm. Phys.

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show abstract

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A graphene/h-BN MEMS varactor for sub-THz and THz applications

Abstract: A mm-size graphene suspended varactor was prepared and characterized. It can be combined with a dielectric rod waveguide to construct a sub-THz phase shifter.

Cited by 1 publication

References 78 publications

Size dependence of melting process of armchair hexagonal boron nitride nanoribbon

Size dependence of melting process of armchair hexagonal boron nitride nanoribbon

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