Jiecheng Zhang

activity

20162026

most citedAnomalous Thermal Diffusivity in Underdoped YBa

_{2}

_{3}

_{6 + x}

97 citations · 173 across the 8 of their papers we have counts for

collaborators

8 papers

math.CO2026

Extremal Spanning Trees in Product Grid Graphs

Jiechen Zhang

We compare spanning-tree counts at a fixed number of vertices for Cartesian products of paths $P_{r}$ , $r \geq 1$ , or cycles $C_{s}$ , $s \geq 3$ . With the number $d$ of factors fixed, an equ…

math.CO2026

Spanning-Tree Maximization Forces Isoperimetry in the Square Lattice

Jiechen Zhang

We determine which connected sets of $N$ vertices in the square lattice support the most spanning trees, using all lattice edges between the chosen vertices. Every maximizer minimi…

math.PR2026

Threshold Rules for the Classical Prophet Inequality

Jiechen Zhang

This note records a common threshold/surplus decomposition for single-threshold stopping rules in the classical prophet inequality. The same decomposition is used to certify severa…

math.PR2025

Explicit Universal Bounds for Cumulants via Moments

Jiechen Zhang

We establish explicit, universal, and distribution-free bounds for the $n$ -th cumulant, $κ_{n} (X)$ , of a scalar random variable, controlled solely by an $n$ -th order absolute moment…

cond-mat.str-el2020★ 9 cited

Anomalous thermal transport and violation of Wiedemann-Franz law in the critical regime of a charge density wave transition

Erik D. Kountz, Jiecheng Zhang, Joshua A. W. Straquadine +5

ErTe $_{3}$ is studied as a model system to explore thermal transport in a layered charge density wave (CDW) material. We present data from thermal diffusivity, resistivity, and speci…

cond-mat.str-el2020★ 32 cited

Thermalization and Possible Signatures of Quantum Chaos in Complex Crystalline Materials

Jiecheng Zhang, Erik D. Kountz, Kamran Behnia +1

Analyses of thermal diffusivity data on complex insulators and on strongly correlated electron systems hosted in similar complex crystal structures suggest that quantum chaos is a…

cond-mat.str-el2018★ 35 cited

Thermal Diffusivity Above Mott-Ioffe-Regel Limit

Jiecheng Zhang, Erik D. Kountz, Eli M. Levenson-Falk +3

We present high-resolution thermal diffusivity measurements on several near optimally doped electron- and hole-doped cuprate systems in a temperature range that passes through the…

cond-mat.supr-con2016★ 97 cited

Anomalous Thermal Diffusivity in Underdoped YBa $_{2}$ Cu $_{3}$ O $_{6 + x}$

J. -C. Zhang, E. M. Levenson-Falk, B. J. Ramshaw +5

We present local optical measurements of thermal diffusivity in the $ab$ plane of underdoped YBCO crystals. We find that the diffusivity anisotropy is comparable to reported values…

Extremal Spanning Trees in Product Grid Graphs

Spanning-Tree Maximization Forces Isoperimetry in the Square Lattice

Threshold Rules for the Classical Prophet Inequality

Explicit Universal Bounds for Cumulants via Moments

Anomalous thermal transport and violation of Wiedemann-Franz law in the critical regime of a charge density wave transition

Thermalization and Possible Signatures of Quantum Chaos in Complex Crystalline Materials

Thermal Diffusivity Above Mott-Ioffe-Regel Limit

Anomalous Thermal Diffusivity in Underdoped YBa2​Cu3​O6+x​

Anomalous Thermal Diffusivity in Underdoped YBa $_{2}$ Cu $_{3}$ O $_{6 + x}$