Dissipationless zero energy epigraphene edge state for nanoelectronics

2021 ◽  
Author(s):  
Vladimir Prudkovskiy ◽  
Yiran Hu ◽  
Kaimin Zhang ◽  
Yue Hu ◽  
Peixuan Ji ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Quantum Hall Effect ◽  
Room Temperature ◽  
Quantum Hall ◽  
Edge State ◽  
Hall Voltage ◽  
Zero Energy ◽  
Silicon Carbide Substrate ◽  
Usual Quantum ◽  
Graphene Edge

Abstract The graphene edge state is essential for graphene electronics and fundamental in graphene theory, however it is not observed in deposited graphene. Here we report the discovery of the epigraphene edge state (EGES) in conventionally patterned epigraphene using plasma-based lithography that stabilizes and passivates the edges probably by fusing the graphene edges to the non-polar silicon carbide substrate, as expected. Transport involves a single, essentially dissipationless conductance channel at zero energy up to room temperature. The Fermi level is pinned at zero energy. The EGES does not generate a Hall voltage and the usual quantum Hall effect is observed only after subtraction of the EGES current. EGES transport is highly protected and apparently mediated by an unconventional zero-energy fermion that is half electron and half hole. Interconnected networks involving only the EGES can be patterned, opening the door to a new graphene nanoelectronics paradigm that is relevant for quantum computing.

scholarly journals Morphology Evolution of Nanoscale-Thick Au/Pd Bimetallic Films on Silicon Carbide Substrate

Micromachines ◽  
2020 ◽  
Vol 11 (4) ◽  
pp. 410
Author(s):  
Francesco Ruffino ◽  
Maria Censabella ◽  
Giovanni Piccitto ◽  
Maria Grimaldi
Keyword(s):  
Silicon Carbide ◽  
Room Temperature ◽  
Three Dimensional ◽  
Morphology Evolution ◽  
Characteristic Parameters ◽  
Coalescence Model ◽  
Silicon Carbide Substrate ◽  
Sputter Deposited ◽  
Bimetallic Films ◽  
Characteristic Growth

Bimetallic Au/Pd nanoscale-thick films were sputter-deposited at room temperature on a silicon carbide (SiC) surface, and the surface-morphology evolution of the films versus thickness was studied with scanning electron microscopy. This study allowed to elucidate the Au/Pd growth mechanism by identifying characteristic growth regimes, and to quantify the characteristic parameters of the growth process. In particular, we observed that the Au/Pd film initially grew as three-dimensional clusters; then, increasing Au/Pd film thickness, film morphology evolved from isolated clusters to partially coalesced wormlike structures, followed by percolation morphology, and, finally, into a continuous rough film. The application of the interrupted coalescence model allowed us to evaluate a critical mean cluster diameter for partial coalescence, and the application of Vincent’s model allowed us to quantify the critical Au/Pd coverage for percolation transition.

scholarly journals MAXWELL-CHERN-SIMONS ELECTRODYNAMICS ON A DISK

1994 ◽  
Vol 09 (19) ◽  
pp. 3417-3441 ◽  
Author(s):  
A.P. BALACHANDRAN ◽  
L. CHANDAR ◽  
E. ERCOLESSI ◽  
T.R. GOVINDARAJAN ◽  
R. SHANKAR
Keyword(s):  
Quantum Hall Effect ◽  
Lie Group ◽  
Single Particle ◽  
Domain Walls ◽  
Quantum Hall ◽  
The Novel ◽  
Edge States ◽  
Zero Energy ◽  
Maxwell Theory ◽  
Chern Simons

The Maxwell-Chern-Simons (MCS) Lagrangian is the Maxwell Lagrangian augmented by the Chern-Simons term. In this paper, we study the MCS and Maxwell Lagrangians on a disk D. They are of interest for the quantum Hall effect, and also when the disk and its exterior are composed of different media. We show that quantization is not unique, but depends on a nonnegative parameter λ. 1/λ is the penetration depth of the fields described by these Lagrangians into the medium in the exterior of D. For λ=0, there are edge observables and edge states localized at the boundary ∂D for the MCS system. They describe the affine Lie group [Formula: see text]. Their excitations carry zero energy, signifying an infinite degeneracy of all states of the theory. There is also an additional infinity of single particle excitations of exactly the same energy proportional to |k|, k being the strength of the Chern-Simons term. The MCS theory for λ=0 has the huge symmetry group [Formula: see text]. In the Maxwell theory, the last-mentioned excitations are absent while the edge observables, which exist for λ=0, commute. Also, these excitations are described by states which are not localized at ∂D and are characterized by a continuous and infinitely degenerate spectrum. All these degeneracies are lifted and edge observables and their states cease to exist for λ>0. The novel excitations discovered in this paper should be accessible to observations. We will discuss issues related to observations, as also the generalization of the present considerations to vortices, domain walls and monopoles, in a paper under preparation.

scholarly journals Quantum Hall effect and inter-edge-state tunneling within a barrier

1995 ◽  
Vol 51 (12) ◽  
pp. 7650-7654 ◽  
Author(s):  
B. L. Johnson ◽  
A. S. Sachrajda ◽  
G. Kirczenow ◽  
Y. Feng ◽  
R. P. Taylor ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Quantum Hall ◽  
Edge State

scholarly journals Two-Dimensional Quantum Hall Effect and Zero Energy State in Few-Layer ZrTe5

Nano Letters ◽  
2021 ◽  
Author(s):  
Fangdong Tang ◽  
Peipei Wang ◽  
Mingquan He ◽  
Masahiko Isobe ◽  
Genda Gu ◽  
...  
Keyword(s):  
Hall Effect ◽  
Quantum Hall Effect ◽  
Energy State ◽  
Quantum Hall ◽  
Two Dimensional ◽  
Zero Energy
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