Qingxiang Xu

collaborators

4 papers

math.FA2025

A simplified formula for the matched projection of an idempotent

Qingxiang Xu

Let $L (H)$ be the set of all adjointable operators on a Hilbert $C^{*}$ -module $H$ . For each $T \in L (H)$ , $T^{*}$ denotes its adjoint operator, and $∣ T^{*} ∣$ is the po…

math.FA2025

The numerical ranges of the generalized quadratic operators

Kangjian Wu, Qingxiang Xu

We investigate the generalized quadratic operator defined by $T = (a I_{H} c A^{*} A b I_{K}),$ where $H$ and $K$ are Hilbert spaces, $…

math.FA2025

Convex inequalities in Hilbert $C^{*}$ -modules

Kangjian Wu, Jia Li, Qingxiang Xu

The H $o ¨$ lder-McCarty inequalities are originally derived in the Hilbert space case and have been generalized via a convex inequality. The main purpose of this paper is t…

cond-mat.mtrl-sci2024

Room-temperature nonlinear transport and microwave rectification in antiferromagnetic MnBi $_{2}$ Te $_{4}$ films

Shanshan Liu, Rhonald Burgos, Enze Zhang +13

The discovery of the nonlinear Hall effect provides an avenue for studying the interplay among symmetry, topology, and phase transitions, with potential applications in signal doub…

A simplified formula for the matched projection of an idempotent

The numerical ranges of the generalized quadratic operators

Convex inequalities in Hilbert C∗-modules

Room-temperature nonlinear transport and microwave rectification in antiferromagnetic MnBi2​Te4​ films

Convex inequalities in Hilbert $C^{*}$ -modules

Room-temperature nonlinear transport and microwave rectification in antiferromagnetic MnBi $_{2}$ Te $_{4}$ films