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¹H NMR: Complex Splitting01:13

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A proton M that is coupled to a proton X results in doublet signals for M. However, NMR-active nuclei can be simultaneously coupled to more than one nonequivalent nucleus. When M is coupled to a second proton A, such as in styrene oxide, each peak in the doublet is split into another doublet.
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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
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Spin–Spin Coupling Constant: Overview01:08

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In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
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Ideally, an unpaired electron shows a single peak in the EPR spectrum due to the transition between the two spin energy states. However, coupling interactions can occur between the spins of the unpaired electron and any neighboring spin-active nuclei. This hyperfine coupling results in hyperfine splitting, where the EPR signal is split into multiplets. The signals split into 2nI + 1 peaks, where n is the number of equivalent nuclei and I is the nuclear spin. These splitting patterns provide...
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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
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Maximal Rashba Splitting in GeTe/Bi2Te3 Heterostructures via Strong Band Bending.

Qing-Lin Yang1,2, Xu Yang1,3, Jia-Wan Li4

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|November 7, 2025
PubMed
Summary
This summary is machine-generated.

Researchers achieved a significantly enhanced Rashba effect in GeTe/Bi2Te3 heterostructures, crucial for room-temperature spintronic devices. This effect stems from strong band bending at the interface, paving the way for novel transistor designs.

Keywords:
Rashba effectband bendingband structureferroelectric Rashba semiconductorsheterostructure

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Spintronics

Background:

  • The Rashba effect is vital for spintronic devices, requiring large Rashba energy (ER), wavenumber offset (k0), and Rashba parameter (αR) for room-temperature operation.
  • Neither ultrathin GeTe films nor monolayer Bi2Te3 exhibit significant Rashba splitting.
  • Achieving substantial Rashba parameters is key to advancing spintronic technologies.

Purpose of the Study:

  • To investigate the Rashba effect in GeTe/Bi2Te3 heterostructures.
  • To explore the influence of heterostructure design and material thickness on Rashba parameters.
  • To elucidate the underlying mechanism responsible for enhanced Rashba splitting.

Main Methods:

  • Fabrication and characterization of GeTe/Bi2Te3 heterostructures with varying GeTe thicknesses.
  • Experimental measurement of Rashba parameters (ER, k0, αR).
  • Density functional theory (DFT) calculations to confirm spin-momentum-locked bands.

Main Results:

  • An unprecedentedly strong Rashba effect was achieved in a 1 nm GeTe / 1 QL Bi2Te3 heterostructure, with ER = 0.57 ± 0.03 eV, k0 = 0.16 ± 0.03 Å-1, and αR = 6.86 ± 0.59 eV·Å.
  • Rashba parameters significantly increased as GeTe thickness decreased in GeTe (x nm)/Bi2Te3 (10 QL) heterostructures, unlike in pure GeTe films.
  • The enhanced Rashba parameter (ΔαR) was found to be proportional to the electric field in the heterojunction region.

Conclusions:

  • The enhanced Rashba effect originates from strong band bending in the GeTe/Bi2Te3 heterojunction, caused by inversion-symmetry breaking and a sharp potential gradient.
  • This study demonstrates a novel approach to enhance Rashba splitting through interface engineering and band bending.
  • The findings open avenues for designing highly efficient spin field-effect transistors with nanoscale spin channels.