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PreprintCC BYChemRxiv

Symmetry-Controlled Topological Phase Coherence Length as a Quantum Descriptor for Interfacial Charge Transfer

  • Parul Kumar Sharma1
  • Subhadip Ghosh2,3
  • Rajesh Thakur4,5
  • Krista R Khiangte4,6
  • Sanjeev Kumar Srivastava4,3
  • Samit Kumar Ray4,3
  • Samik Mukherjee1
  • PARUL KUMAR SHARMA
6 affiliations
  1. 1Jio Institute
  2. 2School of Nano Science and Technology
  3. 3Indian Institute of Technology Kharagpur
  4. 4Department of Physics
  5. 5Himachal Pradesh University
  6. 6Indian Institute of Technology Gandhinagar
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Abstract

Topological crystalline insulators (TCIs) provide a unique platform where crystalline symmetry protects spin-polarized surface states, enabling phase-coherent quantum transport. Here, we establish the topological phase coherence length () as a quantitative quantum descriptor that links symmetry protection, spin transport, and interfacial charge-transfer reactivity in SnTe-based TCIs. Structural confinement (SnTe@S) and vanadium (V) substitution (SnTe@V) are employed to tune the coherence of topological surface states (TSS). Low-temperature (7 K) electron spin resonance measurements reveal pronounced weak antilocalization (WAL) behavior in SnTe@V, exhibiting the highest WAL prefactor ( α) = 1.8 ± 0.2, and the longest phase coherence length ( = 12.5 ± 2.5 nm , signifying multiple coherent TSS channels stabilized by mirror-symmetry restoration. Density functional theory (DFT) calculations demonstrate that spin–orbit coupling (SOC) induced TSS enhance the local density of states and optimize hydrogen adsorption energetics through orbital hybridization between Sn and V, yielding the most favorable Gibbs free energy for hydrogen evolution. The direct correlation between the enlarged and accelerated charge-transfer kinetics identifies the symmetry-controlled topological phase coherence length as a fundamental quantum descriptor dictating charge-transport efficiency. This work establishes phase coherence length as a predictive quantum descriptor for catalytic charge transfer in topological materials.

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Cite

BibTeXRIS
BibTeX
@misc{sharma2026symmetrycontrolled,
  title = {{Symmetry-Controlled Topological Phase Coherence Length as a Quantum Descriptor for Interfacial Charge Transfer}},
  author = {Parul Kumar Sharma and Subhadip Ghosh and Rajesh Thakur and Krista R Khiangte and Sanjeev Kumar Srivastava and Samit Kumar Ray and Samik Mukherjee and PARUL KUMAR SHARMA},
  howpublished = {ChemRxiv},
  year = {2026},
  month = aug,
  doi = {10.26434/chemrxiv.15008050/v1},
  url = {https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008050/v1},
  note = {CC BY},
}
RIS
TY  - UNPB
TI  - Symmetry-Controlled Topological Phase Coherence Length as a Quantum Descriptor for Interfacial Charge Transfer
AU  - Parul Kumar Sharma
AU  - Subhadip Ghosh
AU  - Rajesh Thakur
AU  - Krista R Khiangte
AU  - Sanjeev Kumar Srivastava
AU  - Samit Kumar Ray
AU  - Samik Mukherjee
AU  - PARUL KUMAR SHARMA
PY  - 2026
DA  - 2026/08/30
PB  - ChemRxiv
DO  - 10.26434/chemrxiv.15008050/v1
UR  - https://chemrxiv.org/doi/full/10.26434/chemrxiv.15008050/v1
AB  - Topological crystalline insulators (TCIs) provide a unique platform where crystalline symmetry protects spin-polarized surface states, enabling phase-coherent quantum transport. Here, we establish the topological phase coherence length () as a quantitative quantum descriptor that links symmetry protection, spin transport, and interfacial charge-transfer reactivity in SnTe-based TCIs. Structural confinement (SnTe@S) and vanadium (V) substitution (SnTe@V) are employed to tune the coherence of topological surface states (TSS). Low-temperature (7 K) electron spin resonance measurements reveal pronounced weak antilocalization (WAL) behavior in SnTe@V, exhibiting the highest WAL prefactor ( α) = 1.8 ± 0.2, and the longest phase coherence length ( = 12.5 ± 2.5 nm , signifying multiple coherent TSS channels stabilized by mirror-symmetry restoration. Density functional theory (DFT) calculations demonstrate that spin–orbit coupling (SOC) induced TSS enhance the local density of states and optimize hydrogen adsorption energetics through orbital hybridization between Sn and V, yielding the most favorable Gibbs free energy for hydrogen evolution. The direct correlation between the enlarged and accelerated charge-transfer kinetics identifies the symmetry-controlled topological phase coherence length as a fundamental quantum descriptor dictating charge-transport efficiency. This work establishes phase coherence length as a predictive quantum descriptor for catalytic charge transfer in topological materials.
ER  -