scholarly journals Room temperature strain-induced Landau levels in graphene on a wafer-scale platform

2019 ◽  
Vol 5 (11) ◽  
pp. eaaw5593 ◽  
Author(s):  
P. Nigge ◽  
A. C. Qu ◽  
É. Lantagne-Hurtubise ◽  
E. Mårsell ◽  
S. Link ◽  
...  
Keyword(s):  
Room Temperature ◽  
Landau Levels ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Model Calculations ◽  
Wafer Scale ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Quantum Phenomena ◽  
New Applications ◽  
Micrometer Scale

Graphene is a powerful playground for studying a plethora of quantum phenomena. One of the remarkable properties of graphene arises when it is strained in particular geometries and the electrons behave as if they were under the influence of a magnetic field. Previously, these strain-induced pseudomagnetic fields have been explored on the nano- and micrometer-scale using scanning probe and transport measurements. Heteroepitaxial strain, in contrast, is a wafer-scale engineering method. Here, we show that pseudomagnetic fields can be generated in graphene through wafer-scale epitaxial growth. Shallow triangular nanoprisms in the SiC substrate generate strain-induced uniform fields of 41 T, enabling the observation of strain-induced Landau levels at room temperature, as detected by angle-resolved photoemission spectroscopy, and confirmed by model calculations and scanning tunneling microscopy measurements. Our work demonstrates the feasibility of exploiting strain-induced quantum phases in two-dimensional Dirac materials on a wafer-scale platform, opening the field to new applications.

The Coexistence of Superconductivity and Topological Order in the Bi2Se3 Thin Films

Science ◽  
2012 ◽  
Vol 336 (6077) ◽  
pp. 52-55 ◽  
Author(s):  
Mei-Xiao Wang ◽  
Canhua Liu ◽  
Jin-Peng Xu ◽  
Fang Yang ◽  
Lin Miao ◽  
...  
Keyword(s):  
Thin Films ◽  
Three Dimensional ◽  
Surface States ◽  
Scanning Tunneling ◽  
Majorana Fermions ◽  
Topological Order ◽  
Tunneling Microscopy ◽  
Angle Resolved Photoemission Spectroscopy ◽  
Topological Surface ◽  
Quantum Phenomena

Three-dimensional topological insulators (TIs) are characterized by their nontrivial surface states, in which electrons have their spin locked at a right angle to their momentum under the protection of time-reversal symmetry. The topologically ordered phase in TIs does not break any symmetry. The interplay between topological order and symmetry breaking, such as that observed in superconductivity, can lead to new quantum phenomena and devices. We fabricated a superconducting TI/superconductor heterostructure by growing dibismuth triselenide (Bi2Se3) thin films on superconductor niobium diselenide substrate. Using scanning tunneling microscopy and angle-resolved photoemission spectroscopy, we observed the superconducting gap at the Bi2Se3 surface in the regime of Bi2Se3 film thickness where topological surface states form. This observation lays the groundwork for experimentally realizing Majorana fermions in condensed matter physics.

Room temperature observation of the correlation between atomic and electronic structure of graphene on Cu(110)

RSC Advances ◽  
2016 ◽  
Vol 6 (100) ◽  
pp. 98001-98009 ◽  
Author(s):  
Thais Chagas ◽  
Thiago H. R. Cunha ◽  
Matheus J. S. Matos ◽  
Diogo D. dos Reis ◽  
Karolline A. S. Araujo ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Chemical Vapor Deposition ◽  
Scanning Tunneling Microscopy ◽  
Vapor Deposition ◽  
Room Temperature ◽  
Chemical Vapor ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Temperature Observation ◽  
Atomic And Electronic Structure

We have used atomically-resolved scanning tunneling microscopy and spectroscopy to study the interplay between the atomic and electronic structure of graphene formed on copper via chemical vapor deposition.

Surface Structures of Phosphorus and Indium on Si(111)

1998 ◽  
Vol 05 (01) ◽  
pp. 69-76
Author(s):  
F. P. Netzer ◽  
L. Vitali ◽  
J. Kraft ◽  
M. G. Ramesy
Keyword(s):  
Elevated Temperature ◽  
Room Temperature ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Low Energy Electron Diffraction ◽  
Diffusion Limited ◽  
Lower Terrace ◽  
Surface Reconstructions ◽  
Low Energy Electron ◽  
Stm Images

The interaction of vapor phase P2 with the [Formula: see text] monolayer surface at room temperature and elevated temperature has been monitored by scanning tunneling microscopy (STM) and spectroscopy (STS) in conjunction with Auger electron spectroscopy and low-energy electron diffraction (LEED). The surface rection can be readily followed by STM because of the very different contrast of the reacted areas in the STM images. The reaction develops around overlayer defects at room temperature and appears to be diffusion-limited, whereas at 300°C the reaction is initiated at the step edges, from which the reaction front progresses onto the lower terrace areas. At elevated temperature several ordered surface reconstructions, showing different STS fingerprints, are detected on the P–In/Si(111) surfaces, which are associated tentatively with P- and Si-terminated structures and an ordered InP phase.

Analytical and numerical estimates of nonlocal effects at low atomic scales: periodic structures, Landau levels, and quantum box

2021 ◽  
pp. 1-6
Author(s):  
Rami Ahmad El-Nabulsi
Keyword(s):  
Kinetic Energy ◽  
Scanning Tunneling Microscope ◽  
Uncertainty Relation ◽  
Periodic Structures ◽  
Landau Levels ◽  
Scanning Tunneling ◽  
Nonlocal Effects ◽  
Tunneling Microscope ◽  
Quantum Phenomena ◽  
Low Dimensional

A generalized nonlocal uncertainty relation is constructed based on the notion of quantum acceleratum operator obtained in the framework of nonlocal-in-time kinetic energy approach for the case of reversible motion. The new uncertainty relation modified all quantum Hamiltonians and predicts nonlocal corrections to various phenomena at low-dimensional and nanoscales. We evaluate analytically and numerically nonlocal corrections for various quantum phenomena, mainly the Landau levels, the periodic structures, and the quantum box, and we constrain our results with the scanning tunneling microscope experiment. Several features were discussed accordingly.

scholarly journals Room-temperature growth of submonolayers of silicon on Si(001) studied with scanning tunneling microscopy

1997 ◽  
Vol 55 (7) ◽  
pp. 4723-4730 ◽  
Author(s):  
J. van Wingerden ◽  
A. van Dam ◽  
M. J. Haye ◽  
P. M. L. O. Scholte ◽  
F. Tuinstra
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Room Temperature ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Temperature Growth

scholarly journals The Effect of Deposition Time on the Surface Coverage of Sublimation Deposited Solid-Phase Glycine and Proline Molecules Measured by Scanning Tunneling Microscopy

Molecules ◽  
2020 ◽  
Vol 25 (13) ◽  
pp. 2962
Author(s):  
Young-Sang Youn
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Room Temperature ◽  
Deposition Time ◽  
Surface Coverage ◽  
Solid Phase ◽  
Scanning Tunneling ◽  
Adsorption Model ◽  
Tunneling Microscopy ◽  
Langmuir Adsorption ◽  
Stm Images

The effect of deposition time on the surface coverage of sublimation deposited solid-phase glycine and proline molecules onto a Ge(100) surface was studied at room temperature using scanning tunneling microscopy (STM). The STM images obtained at various coverages of glycine and proline adsorbed on the Ge(100) surface showed that (i) the adsorption rate for both molecules gradually decreased with increasing deposition time, obeying the Langmuir adsorption model, and (ii) the coverage of glycine on the Ge(100) surface is higher than that of proline under the same deposition conditions, which may be due to the differences in their molecular weight or molecular sticking probability.

Directed assembly of fullerene on modified Au(111) electrodes

2018 ◽  
Vol 54 (58) ◽  
pp. 8052-8055 ◽  
Author(s):  
Zhen-Feng Cai ◽  
Wei-Long Dong ◽  
Ting Chen ◽  
Hui-Juan Yan ◽  
Dong Wang ◽  
...  
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Room Temperature ◽  
Directed Assembly ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Conceptual Approach

Here we show a conceptual approach to realize the scanning tunneling microscopy based induced-assembly of fullerene (C60) molecules on top of a buffer organic adlayer at room temperature in a solution environment.

scholarly journals Thermal evolution of the morphology of Ni/Ge(111)-c(2 × 8) surface

2014 ◽  
Vol 32 (4) ◽  
pp. 641-647 ◽  
Author(s):  
Agnieszka Tomaszewska ◽  
Jhen-Hao Li ◽  
Xiao-Lan Huang ◽  
Tsu-Yi Fu
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Room Temperature ◽  
Thermal Evolution ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Nucleation Sites ◽  
Dual Polarity ◽  
Stm Images

AbstractThe thermal evolution of the interface formed by room temperature (RT) deposition of Ni atoms (coverage 0.1, 0.5, 1.2 ML) onto a Ge(111)-c(2 × 8) surface has been studied with the use of scanning tunneling microscopy (STM). Atomically resolved STM images revealed that, at RT, the boundaries between the different c(2 × 8) domains acted as nucleation sites for Ni atoms. After annealing the surface with deposited material at 473 to 673 K the formation of nano-sized islands of NixGey compounds was observed. In addition, the occurrence of ring-like structures was recorded. Based on the dual-polarity images the latter were assigned to Ni atoms adsorbed on Ge adatoms.

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