scholarly journals Yu-Shiba-Rusinov bands in ferromagnetic superconducting diamond

2020 ◽  
Vol 6 (20) ◽  
pp. eaaz2536
Author(s):  
Gufei Zhang ◽  
Tomas Samuely ◽  
Naoya Iwahara ◽  
Jozef Kačmarčík ◽  
Changan Wang ◽  
...  
Keyword(s):  
Lattice Structure ◽  
Three Dimensional ◽  
Superconducting Devices ◽  
Electronic States ◽  
Scanning Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Boron Doped Diamond ◽  
Spin Lattice ◽  
Boron Doped ◽  
Potential Applications

The combination of different exotic properties in materials paves the way for the emergence of their new potential applications. An example is the recently found coexistence of the mutually antagonistic ferromagnetism and superconductivity in hydrogenated boron-doped diamond, which promises to be an attractive system with which to explore unconventional physics. Here, we show the emergence of Yu-Shiba-Rusinov (YSR) bands with a spatial extent of tens of nanometers in ferromagnetic superconducting diamond using scanning tunneling spectroscopy. We demonstrate theoretically how a two-dimensional (2D) spin lattice at the surface of a three-dimensional (3D) superconductor gives rise to the YSR bands and how their density-of-states profile correlates with the spin lattice structure. The established strategy to realize new forms of the coexistence of ferromagnetism and superconductivity opens a way to engineer the unusual electronic states and also to design better-performing superconducting devices.

Scanning-tunneling spectroscopy on conjugated polymer films

2003 ◽  
Vol 771 ◽  
Author(s):  
M. Kemerink ◽  
S.F. Alvarado ◽  
P.M. Koenraad ◽  
R.A.J. Janssen ◽  
H.W.M. Salemink ◽  
...  
Keyword(s):  
Polymer Films ◽  
Conjugated Polymer ◽  
Three Dimensional ◽  
Field Enhancement ◽  
Direct Consequence ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Band Alignment ◽  
Scanning Tunneling ◽  
Order Of Magnitude

AbstractScanning-tunneling spectroscopy experiments have been performed on conjugated polymer films and have been compared to a three-dimensional numerical model for charge injection and transport. It is found that field enhancement near the tip apex leads to significant changes in the injected current, which can amount to more than an order of magnitude, and can even change the polarity of the dominant charge carrier. As a direct consequence, the single-particle band gap and band alignment of the organic material can be directly obtained from tip height-voltage (z-V) curves, provided that the tip has a sufficiently sharp apex.

STM Study of Diamond(001) Surface

1992 ◽  
Vol 242 ◽  
Author(s):  
Takashi Tsuno ◽  
Takahiro Imai ◽  
Yoshiki Nishibayashi ◽  
Naoji Fujimori
Keyword(s):  
Methane Concentration ◽  
Chemical Vapor ◽  
Epitaxial Films ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Boron Doped Diamond ◽  
Boron Doped ◽  
Partially Observed ◽  
Type Reconstruction ◽  
B Doping

ABSTRACTUndoped and boron-doped diamond epitaxial films were deposited on diamond(001) substrate by micro-wave plasma assisted chemical vapor deposition and their surfaces were studied by scanning tunneling microscopy in air. An atomic order resolution was confirmed for the observation.For the undoped epitaxial films, which showed 2×1 and 1×2 RHEED patterns, dimer type reconstruction was observed and it was considered that the growth occurs through the dimer row extension. In the case of B-doped films, the dimer reconstruction was also observed. However, 2×2 structure due to the absence of dimer was partially observed.The effect of boron concentration and methane concentration during epitaxial growth on the surface morphology were also studied. The morphology observed by STM became flatter, as the concentration of B-doping and methane concentration, during growth, increased.

scholarly journals Scalable Majorana vortex modes in iron-based superconductors

2020 ◽  
Vol 6 (9) ◽  
pp. eaay0443 ◽  
Author(s):  
Ching-Kai Chiu ◽  
T. Machida ◽  
Yingyi Huang ◽  
T. Hanaguri ◽  
Fu-Chun Zhang
Keyword(s):  
Tight Binding ◽  
Three Dimensional ◽  
Scanning Tunneling Spectroscopy ◽  
Scanning Tunneling ◽  
Zero Energy ◽  
Binding Model ◽  
Zero Bias ◽  
Iron Based Superconductors ◽  
Iron Based ◽  
Important Indication

The iron-based superconductor FeTexSe1−x is one of the material candidates hosting Majorana vortex modes residing in the vortex cores. It has been observed by recent scanning tunneling spectroscopy measurement that the fraction of vortex cores having zero-bias peaks decreases with increasing magnetic field on the surface of FeTexSe1−x. The hybridization of two Majorana vortex modes cannot simply explain this phenomenon. We construct a three-dimensional tight-binding model simulating the physics of over a hundred Majorana vortex modes in FeTexSe1−x. Our simulation shows that the Majorana hybridization and disordered vortex distribution can explain the decreasing fraction of the zero-bias peaks observed in the experiment; the statistics of the energy peaks off zero energy in our Majorana simulation are in agreement with the experiment. These agreements lead to an important indication of scalable Majorana vortex modes in FeTexSe1−x. Thus, FeTexSe1−x can be one promising platform having scalable Majorana qubits for quantum computing.

scholarly journals Electronic states of InAs/GaAs quantum dots by scanning tunneling spectroscopy

2010 ◽  
Vol 97 (12) ◽  
pp. 123110 ◽  
Author(s):  
S. Gaan ◽  
Guowei He ◽  
R. M. Feenstra ◽  
J. Walker ◽  
E. Towe
Keyword(s):  
Quantum Dots ◽  
Electronic States ◽  
Scanning Tunneling Spectroscopy ◽  
Tunneling Spectroscopy ◽  
Scanning Tunneling

Electrochemical incineration of vinasse in filter-press-type FM01-LC reactor using 3D BDD electrode

2008 ◽  
Vol 58 (12) ◽  
pp. 2413-2419 ◽  
Author(s):  
J. L. Nava ◽  
A. Recéndiz ◽  
J. C. Acosta ◽  
I. González
Keyword(s):  
Aqueous Media ◽  
Three Dimensional ◽  
Oxygen Demand ◽  
Electrochemical Reactor ◽  
Filter Press ◽  
Boron Doped Diamond ◽  
Diamond Electrode ◽  
Boron Doped ◽  
Boron Doped Diamond Electrode ◽  
Electrochemical Incineration

This work shows results obtained in the electrochemical incineration of a synthetic vinasse with initial chemical oxygen demand (COD) of 75.096 g L−1 in aqueous media (which resembles vinasse industrial wastewater). Electrolyses in a filter-press-type FM01-LC electrochemical reactor equipped with a three-dimensional (3D) boron doped diamond electrode (BDD) were performed at Reynolds values between 22 ≤ Re ≤ 109, and a fixed current density of 10 mA cm−2. The electrochemical incineration achieved up to 97% in vinasse mineralization with current efficiencies that surpass unity and energy consumption of 168 KW-h m−3, at Re =109. The mineralization of vinasse indicates that such degradation occurs via hydroxyl radicals formed by the oxidation of water on the BDD surface. Experimental data revealed that hydrodynamic conditions slightly influence the vinasse degradation rate and current efficiency, indicating that the oxidation involves a complex pathway.

Topology of synthetic, boron-doped diamond by scanning tunneling microscopy

1994 ◽  
Vol 3 (1-2) ◽  
pp. 94-97 ◽  
Author(s):  
Shenda M. Baker ◽  
George R. Rossman ◽  
John D. Baldeschwieler
Keyword(s):  
Scanning Tunneling Microscopy ◽  
Scanning Tunneling ◽  
Tunneling Microscopy ◽  
Boron Doped Diamond ◽  
Boron Doped

scholarly journals Emergence of Distinct Electronic States in Epitaxially-Fused PbSe Quantum Dot Superlattices

2021 ◽  
Author(s):  
Mahmut Sami Kavrik ◽  
Jordan Hachtel ◽  
Wonhee Ko ◽  
Caroline Qian ◽  
Alex Abelson ◽  
...  
Keyword(s):  
Band Gap ◽  
High Efficiency ◽  
Electronic States ◽  
Scanning Tunneling Spectroscopy ◽  
Band Gap Energy ◽  
Scanning Tunneling ◽  
Material System ◽  
High Efficiency Solar Cells ◽  
Electron Energy Loss ◽  
Band Gap Modulation

Abstract Quantum coupling in arrayed nanostructures may induce novel mesoscale properties such as electronic minibands that may lead to applications including high efficiency solar cells. Colloidal PbSe quantum dots (QDs) can self-assemble into epitaxially-fused superlattices (epi-SLs), making them a promising material system to study collective phenomena. In the present study, the presence of distinct local electronic states induced by crystalline necks connecting individual PbSe QDs is documented by several techniques that leads to modulation of the band gap energy across the epi-SL. The energy band gap measured by multi-probe scanning tunneling spectroscopy (STS) shows variation from 0.7 eV at the center of the QDs to 1.1 eV at their necks. Complementary monochromated electron energy-loss spectroscopy (EELS) measurements reveal the presence of distinct electronic states from necks in the epi-SL, confirming the STS measurements and demonstrating band gap modulation in spectral mapping. It is hypothesized that these new electronic states are induced by quantum confinement of carriers in the necks between the QDs, redefining the energy landscape of the PbSe QD epi-SL.

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