Related Experiment Video
Updated: Jan 12, 2026
10:36
Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
11.9K
Electrostatic Control of Quantum Phases in KTaO3-Based Planar Constrictions
Jordan T McCourt1, Ethan G Arnault2, Merve Baksi1
1Department of Physics, Duke University, Durham, North Carolina 27708, United States.
Nano Letters
|November 4, 2025
Summary
Researchers developed a scalable method to create tunable superconducting quantum nanostructures using complex oxide interfaces. This approach allows precise control over critical current and transitions to dissipative states with low gate voltages.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Quantum Engineering
Background:
- Two-dimensional electron gases (2DEGs) at complex oxide interfaces are promising for quantum nanostructures.
- Scalable fabrication of devices in these materials presents significant challenges.
Purpose of the Study:
- To demonstrate an efficient and scalable fabrication approach for tunable quantum nanostructures.
- To engineer superconducting properties in KTaO3-based heterostructures using electrostatic gating.
Main Methods:
- Patterning narrow constrictions in superconducting KTaO3-based heterostructures.
- Utilizing coplanar side gates for electrostatic modulation of the 2DEG.
- Leveraging the high dielectric permittivity of KTaO3 for strong electrostatic control.
Main Results:
- Achieved efficient electrostatic modulation of the superconducting 2DEG.
- Demonstrated tunable critical current and Berezinskii-Kosterlitz-Thouless transition temperature.
- Enabled transition to a dissipative state with gate voltages below 1 V.
Conclusions:
- The developed fabrication process is scalable and versatile for quantum devices.
- This platform facilitates the study of physical phenomena at complex oxide interfaces.
- Enables precise control over superconducting states in nanostructures.
Related Concept Videos
02:46Crystal Field Theory - Tetrahedral and Square Planar Complexes
48.1K
Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...
48.1K
02:58Crystal Field Theory - Octahedral Complexes
30.5K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
30.5K
01:27Electrostatic Boundary Conditions in Dielectrics
1.8K
When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's permittivity....
1.8K
02:42Valence Bond Theory
11.2K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.2K
01:16Electrostatic Boundary Conditions
922
Consider an external electric field propagating through a homogeneous medium. When the electric field crosses the surface boundary of the medium, it undergoes a discontinuity. The electric field can be resolved into normal and tangential components. The amount by which the field changes at any boundary is given by the difference between the field components above and below the surface boundary.
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
The surface integral of an electric field is given by Gauss's law in integral form and is related to...
922
01:26Photochemical Electrocyclic Reactions: Stereochemistry
2.2K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
Selection Rules: Photochemical Activation
2.2K