Jie Qin
Let $F^{2,m}(\mathbb{C})$ denote the Fock-Sobolev space of complex plane. In this paper, we characterize the semi-commutator of two Toeplitz operators on $F^{2,m}(\mathbb{C})$ is zero. The result is different from the result of Bauer, Choe, and Koo. (J. Funct. Anal., 268 (2015): 3017-3060.)
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In this paper, we completely characterize when two dual truncated Toeplitz operators are essentially commuting and when the semicommutator of two dual truncated Toeplitz operators is compact. Our main idea is to study dual truncated Toeplitz operators via Hankel operators, Toeplitz operators and function algebras.
Toeplitz matrices are ubiquitous and play important roles across many areas of mathematics. In this paper, we present some algebraic results concerning block Toeplitz matrices with block entries belonging to a commutative algebra $Å$. The characterization of normal block Toeplitz matrices with entries from $Å$ is also obtained.
Commuting Toeplitz operators with harmonic symbols on the Fock space
该研究针对Bauer等人提出的交换Toeplitz算子刻画给出反例，修正了单复变量Fock空间上带指数型调和符号的Toeplitz算子的刻画。
Commuting analytic and co-analytic Toeplitz operators on the harmonic Bergman space
本文通过构造二次型，证明了调和Bergman空间上解析与共解析Toeplitz算子交换时至少一个符号为常数，解决了1999年的开放问题。
The maximal algebras of scalar Toeplitz matrices are known to be formed by generalized circulants. The identification of algebras consisting of block Toeplitz matrices is a harder problem, that has received little attention up to now. We consider the case when the block entries of the matrices belong to a commutative algebra $ \mathcal{A} $. After obtaining some general results, we classify all the maximal algebras for certain particular cases of $ \mathcal{A}$.
We make a progress towards describing the semi-commutants of Toeplitz operators on Fock-Sobolev spaces of nonnegative orders. We generalize the results in \cite{Bauer1,Qin}. For the certain symbol spaces, we obtain two Toeplitz operators can semi-commute only in the trivial cases, which is different from what is known for the classical Fock spaces. As an application, we consider the conjecture which was shown to be false for Fock space in \cite{MA}. The main results of this paper say that there is the fundamental difference between the geometries of Fock and Fock-Sobolev space.
Norm bounds for self-adjoint Toeplitz operators with non-radial symbols on the Fock space
本研究将Galbis的Fock空间自伴Toeplitz算子范数界推广至非径向有界可积符号，通过移植Nicola-Tilli等周不等式与适配Galbis的二维积分逼近论证完成拓展。
A Fourier Criterion for the Toeplitzness of Operators on Fock Spaces
给出福克空间上识别有界可测符号托普利兹算子的傅里叶准则，通过反对角限制的傅里叶逆变换恢复符号，还用于刻画加权复合算子和广义沃尔泰拉型算子的托普利兹可表示性。
Toeplitz operators on large vector-valued Fock spaces
本文刻画了大向量值Fock空间上Toeplitz算子的有界性、紧性及Schatten类性质，通过引入算子值Berezin变换和平均函数，并利用Carleson测度给出完整表征。
In this paper we characterize the Schatten $p$ class membership of Toeplitz operators with positive measure symbols acting on generalized Fock spaces for the full range $0 < p < \infty$.
Toeplitz Operators with Positive Measures on Harmonic Fock Spaces
该研究聚焦调和Fock空间上带正测度的Toeplitz算子，借助算子的Berezin变换方法，推导得出该算子有界性、紧性及Schatten类S_p的等价条件。
In this paper, we investigate the boundedness of Toeplitz product $T_{f}T_{g}$ and Hankel product $H_{f}^{*} H_{g}$ on Fock-Sobolev space for two polynomials $f$ and $g$ in $z,\overline{z}\in\mathbb{C}^{n}$. As a result, the boundedness of Toeplitz operator $T_{f}$ and Hankel operator $H_{f}$ with the polynomial symbol $f$ in $z,\overline{z}\in\mathbb{C}^{n}$ is characterized.
An estimate for the norm of selfadjoint Toeplitz operators with a radial, bounded and integrable symbol is obtained. This emphasizes the fact that the norm of such operator is strictly less than the supremum norm of the symbol. Consequences for time-frequency localization operators are also given.
We give a characterization of compact and Fredholm operators on polyanalytic Fock spaces in terms of limit operators. As an application we obtain a generalization of the Bauer-Isralowitz theorem using a matrix valued Berezin type transform. We then apply this theorem to Toeplitz and Hankel operators to obtain necessary and sufficient conditions for compactness. As it turns out, whether or not a Toeplitz or Hankel operator is compact does not depend on the polyanalytic order. For Hankel operators this even holds on the true polyanalytic Fock spaces.
Hyponormality and quasinormality of unbounded Toeplitz operators with non harmonic symbol on the Fock Sobolev space
本文研究了非谐振算符在福克-索波列夫空间上的本征值和准本征值本质标准，揭示了非谐振算符的准本征值与本征值之间的关系。
In this paper we will give necessary and sufficient conditions for the operator $T_ν^s$ to be in the symmetrically normed ideal $\mathcal{C}_Φ$ for an arbitrary symmetric norming function $Φ$ where $T_ν$ is the Toeplitz operator on the generalized Fock Space (also known as the generalized Bargmann-Fock space) with a positive measure symbol $ν$ and $0<s\leq 1$.
Sarason Toeplitz product problem asks when the operator TuTv is bounded on various Hilbert spaces of analytic functions, where u and v are analytic. The problem is highly nontrivial for Toeplitz operators on the Hardy space and the Bergman space (even in the case of the unit disk). In this paper, we provide a complete solution to the problem for a class of Fock spaces on the complex plane. In particular, this generalizes an earlier result of Cho, Park, and Zhu.
Our purpose is to characterize the so-called horizontal Fock-Carleson type measures for derivatives of order $k$ (we write it $k$-hFC for short) for the Fock space as well as the Toeplitz operators generated by sesquilinear forms given by them. The boundedness conditions for such operators are found. We introduce real coderivatives of $k$-hFC type measures and show that the C*-algebra generated by Toeplitz operators with the corresponding class of symbols is commutative and isometrically isomorphic to certain $C^*$-subalgebra of $L_{\infty}(\mathbb{R}^{n})$. The above results are extended to m…
Toeplitz operators on weighted Fock spaces with $A_{\infty}$-type weights
本文研究了在带有$A_{\infty}$型权重的加权Fock空间上Toeplitz算子的有界性、紧致性及Schatten $p$-类性质，并探讨了其在Volterra算子和加权复合算子中的应用。
Compared with harmonic Bergman spaces, this paper introduces a new function space which is called the pluriharmonic Hardy space $h^{2}(\mathbb{T}^{2})$. We character (semi-) commuting Toeplitz operators on $h^{2}(\mathbb{T}^{2})$ with bounded pluriharmonic symbols. Interestingly, these results are quite different from the corresponding properties of Toeplitz operators on Hardy spaces, Bergman spaces and harmonic Bergman spaces. Our method for Toeplitz operators on $h^{2}(\mathbb{T}^{2})$ gives new insight into the study of commuting Toeplitz operators on harmonic Bergman spaces.
Essential positivity for Toeplitz operators on the Fock space
针对Fock空间上Toeplitz算子的本质正性问题，本文用极限算子给出刻画，并证明该猜想在非径向但符号为VMO时成立。
Toeplitz Operators on Quaternionic Fock Spaces
本文研究了四元数福克空间上具有正测度符号和切片函数符号的Toeplitz算子的有界性和紧性，通过归一化再生核和对称盒子平均提出判据，同时引入全局四元数福克空间定义具有实值测度符号的Toeplitz算子。
There are three main results in this paper. First, we find an easily computable and simple condition which is necessary and sufficient for a commuting tuple of contractions to possess a non-zero Toeplitz operator. This condition is just that the adjoint of the product of the contractions is not pure. On one hand this brings out the importance of the product of the contractions and on the other hand, the non-pureness turns out to be equivalent to the existence of a pseudo-extension to a tuple of commuting unitaries. The second main result is a commutant pseudo-extension theorem obtained by stud…
Toeplitz Operators on Fock Space $F_α^{\infty}$
本文通过Berezin变换研究复空间正Borel测度成为特定Fock-Carleson测度的充要条件，讨论对应Toeplitz算子在$F_α^{\boldsymbol{\infty}}$上的有界性与紧性，并刻画符号属$BMO$的Toeplitz算子的相关性质。
In sprite by Berger-Coburn theorems and their conjecture in \cite{Coburn1994}, we use the Fourier transform to decompose $ T_{g}$ as an infinite sum of Toeplitz operators with symbols which have compact support in the frequency domain. As a consequence, we obtain a sufficient condition for $ T_{g}$ to be bounded in terms of the Carleson measure conditions defined by the heat transform of the symbol $g$. Moreover the decomposition of a Toeplitz operator leads us to get easily understanding that for a bounded function $g$, if its Berezin transform vanishes at infinity, then the Toeplitz operator…
Toeplitz operators on non-reflexive Fock spaces
本文将自反 Fock 空间上 Toeplitz 算子的紧性、Fredholm 性质及 Toeplitz 代数等结果推广至非自反情形，并改进了相关对应理论。
On the unit ball B^n we consider the weighted Bergman spaces H_λand their Toeplitz operators with bounded symbols. It is known from our previous work that if a closed subgroup H of \widetilde{\SU(n,1)} has a multiplicity-free restriction for the holomorphic discrete series of $\widetilde{\SU(n,1)}$, then the family of Toeplitz operators with H-invariant symbols pairwise commute. In this work we consider the case of maximal abelian subgroups of \widetilde{\SU(n,1)} and provide a detailed proof of the pairwise commutativity of the corresponding Toeplitz operators. To achieve this we explicitly d…
In this paper, we completely characterize the finite rank commutator and semi-commutator of two monomial-type Toeplitz operators on the Bergman space of certain weakly pseudoconvex domains. Somewhat surprisingly, there are not only plenty of commuting monomial-type Toeplitz operators but also non-trivial semi-commuting monomial-type Toeplitz operators. Our results are new even for the unit ball.%The situation is different from the case of unit disk. %Our results extend several known results using completely different arguments. Some interesting higher-dimensional phenomena appear on the unit p…
The classical theory of Toeplitz operators in spaces of analytic functions deals usually with symbols that are bounded measurable functions on the domain in question. A further extension of the theory was made for symbols being unbounded functions, measures, and compactly supported distributions, all of them subject to some restrictions. In the context of a reproducing kernel Hilbert space we propose a certain framework for a `maximally possible' extension of the notion of Toeplitz operators for a `maximally wide' class of `highly singular' symbols. Using the language of sesquilinear forms we …
Analytic continuation of Toeplitz operators and commuting families of $C^*-$algebras
本文研究单位球加权 Bergman 空间上 Toeplitz 算子的解析延拓，证明其生成的 C*-代数在特定符号下可交换，并推广限制原理得到广义 Segal-Bargmann 变换及谱的积分公式。
Weighted theory of Toeplitz operators on the Fock spaces
本文研究了Fock空间上Toeplitz算子的加权紧致性和有界性，通过Berezin变换的无穷远处消失性刻画了算子的紧致性，并建立了Fock投影的双权不等式，回答了Bergman-Toeplitz算子加权紧致性的问题。
The Fock space $\mathcal{F}(\mathbb{C}^n)$ is the space of holomorphic functions on $\mathbb{C}^n$ that are square-integrable with respect to the Gaussian measure on $\mathbb{C}^n$. This space plays an important role in several subfields of analysis and representation theory. In particular, it has for a long time been a model to study Toeplitz operators. Esmeral and Maximenko showed in 2016 that radial Toeplitz operators on $\mathcal{F}(\mathbb{C})$ generate a commutative $C^*$-algebra which is isometrically isomorphic to the $C^*$-algebra $C_{b,u}(\mathbb{N}_0,ρ_1)$. In this article, we exten…
Commuting Slant Toeplitz Operators on the Bergman Space
本文研究了开单位圆盘Bergman空间上的斜Toeplitz算子，证明了两个此类算子可交换的充要条件是两者的有界解析函数相等。
The Fock space consists of all entire functions which are square integrable with respect to Gauss measure. The Toeplitz algebra is the C*-algebra generated by the Toeplitz operator with bounded symbol on the Fock space. In this paper, we study the Toeplitz algebra on the Fock space.
Commuting Toeplitz operators with biharmonic symbols
研究单位圆盘上Bergman空间上符号属于双谐函数子类的Toeplitz算子的交换问题，确定其交换条件，并描述此类正常Toeplitz算子的性质。
Operators in the Fock-Toeplitz algebra
本文研究了高斯平方可积整函数Fock空间上的多类有界算子，探究其包含于Toeplitz代数的条件，结合文献综述与量子调和分析视角的新证明，并提出了新定理与已知结果间的联系。
Commuting slant Toeplitz operators for polyanalytic and harmonic symbols
研究单位圆盘Bergman空间上斜Toeplitz算子的交换性与零乘积，证明多解析与调和符号下交换等价于符号线性相关，并给出有限秩交换子为零及乘积为零的充要条件。
In the setting of the Fock space over the complex plane, Bauer and Lee have recently characterized commutants of Toeplitz operators with radial symbols, under the assumption that symbols have at most polynomial growth at infinity. Their characterization states: If one of the symbols of two commuting Toeplitz operators is nonconstant and radial, then the other must be also radial. We extend this result to the Fock-Sobolev spaces.
Nuclear Toeplitz operators between Fock spaces
研究Borel测度符号的Toeplitz算子$T_\mu: F_\alpha^p \to F_\alpha^q$的核性，给出了$q\leq p$时基于Berezin变换的充要条件，并揭示了$p<q$时Berezin变换不足以完全刻画。
In this paper, we characterize operator-theoretic properties (boundedness, compactness, and Schatten class membership) of Toeplitz operators with positive measure symbols on weighted Fock-Sobolev spaces of fractional order.
The Fredholm property of Toeplitz operators on the $p$-Fock spaces $F_α^p$ on $\mathbb{C}^n$ is studied. A general Fredholm criterion for arbitrary operators from the Toeplitz algebra $\mathcal{T}_{p,α}$ on $F_α^p$ in terms of the invertibility of limit operators is derived. This paper is based on previous work, which establishes corresponding results on the unit balls $\mathbb{B}^n$.
We study two problems involving algebraic properties of Toeplitz operators on generalized Fock spaces on $\mathbb{C}^d$ with weights of the form $\left|z\right|^{2s} e^{-\left|z\right|^{2m}}$, $m\geq 1,\ s\geq 0$. We determine the commutant of a given Toeplitz operator with a radial symbol which satisfies certain growth conditions. We also discuss the equation $T_fT_g=0$, when $f$ or $g$ is radial.
Let $f$ and $g$ be functions, not identically zero, in the Fock space $F^2$ of $C_n$. We show that the product $T_fT_{\bar g}$ of Toeplitz operators on $F^2$ is bounded if and only if $f(z)=e^{q(z)}$ and $g(z)=ce^{-q(z)}$, where $c$ is a nonzero constant and $q$ is a linear polynomial.
We prove that every multiplier M (bounded operator commuting with the shift operator) on a large class of Banach spaces of sequences on Z is associated to a function essentially bounded by the norm of M on the spectrum of S.
We prove several results concerning the theory of Toeplitz algebras over $p$-Fock spaces using a correspondence theory of translation invariant symbol and operator spaces. The most notable results are: The full Toeplitz algebra is the norm closure of all Toeplitz operators with bounded uniformly continuous symbols. This generalizes a result obtained by J. Xia (J. Funct. Anal. 269:781-814, 2015) in the case $p = 2$, which was proven by different methods. Further, we prove that every Toeplitz algebra which has a translation invariant $C^\ast$ subalgebra of the bounded uniformly continuous functi…
Zero-product problem for Toeplitz operators on the Fock space
本文构造了 Fock 空间上非径向符号的 Toeplitz 算子，证明其非零但乘积为零，回答了 Bauer 和 Le 的零积问题，并给出不同维数和增长条件下的具体例子。
Recently the authors characterized the Fredholmn properties of Toeplitz operators on weighted Fock spaces when the Laplacian of the weight function is bounded below and above. In the present work the authors extend their characterization to doubling Fock spaces with a subharmonic weight whose Laplacian is a doubling measure. The geometry induced by the Bergman metric for doubling Fock spaces is much more complicated than that of the Euclidean metric used in all the previous cases to study Fredholmness, which leads to considerably more involved calculations.
We consider Toeplitz operators in the Fock space, under rather general conditions imposed on the symbols. It is proved that if the operator has finite rank and the symbol is a function then the operator and the symbol should be zero. The method of proving is different from the one used previously for finite rank theorems, and it enables one to get rid of the compact support condition for symbols imposed previously.
IDA symbols and Schatten--Lorentz theory for Toeplitz operators on weighted Fock spaces
本文研究加权Fock空间上Toeplitz算子的Schatten--Lorentz类成员资格，通过局部解析距离与Lorentz条件给出完整刻画，并推导出二次权情形的显式Weyl常数。
In this paper, we study Toeplitz algebras generated by certain class of Toeplitz operators on the $p$-Fock space and the $p$-Bergman space with $1<p<\infty$. Let BUC($\mathbb C^n$) and BUC($\mathbb B_n$) denote the collections of bounded uniformly continuous functions on $\mathbb C^n$ and $\mathbb B_n$ (the unit ball in $\mathbb C^n$), respectively. On the $p$-Fock space, we show that the Toeplitz algebra which has a translation invariant closed subalgebra of BUC($\mathbb C^n$) as its set of symbols is linearly generated by Toeplitz operators with the same space of symbols. This answers a ques…
We study mapping properties of Toeplitz operators $T_μ$ associated to nonnegative Borel measure $μ$ on the complex space $\mathbb{C}^n$. We, in particular, describe the bounded and compact operators $T_μ$ acting between Fock spaces in terms of the objects $t$-Berezin transforms, averaging functions, and averaging sequences of their inducing measures $μ$. An asymptotic estimate for the norms of the operators has been also obtained. The results obtained extend a recent work of Z. Hu and X. Lv and fills the remaining gap when both the smallest and largest Banach--Fock spaces are taken into accoun…
In this paper we show that the C*-algebra generated by radial Toeplitz operators with $L_{\infty}$-symbols acting on the Fock space is isometrically isomorphic to the C*-algebra of bounded sequences uniformly continuous with respect to the square-root-metric $ρ(j,k)=|\sqrt{\vphantom{jk}j}-\sqrt{\vphantom{jk}k}\,|$. More precisely, we prove that the sequences of eigenvalues of radial Toeplitz operators form a dense subset of the latter C*-algebra of sequences.
We study the asymptotic expansion of the product of two Toeplitz operators on the Fock space. In comparison to earlier results we require significantly less derivatives and get the expansion to arbitrary order. This, in particular, improves a result of Borthwick related to Toeplitz quantization. In addition, we derive an intertwining identity between the Berezin star product and the sharp product.
Absolutely summing Toeplitz operators on weighted Fock spaces
本文研究加权Fock空间上复符号Toeplitz算子的绝对r-求和性，通过IDA分解和Rademacher论证等工具，给出了基于局部均值、复球平均和Berezin变换的等价刻画，并证明了准则的最优性。
Let us consider, for $n \geq 3$, the Cartan domain $\mathrm{D}_n^{\mathrm{IV}}$ of type IV. On the weighted Bergman spaces $\mathcal{A}^2_λ(\mathrm{D}_n^{\mathrm{IV}})$ we study the problem of the existence of commutative $C^*$-algebras generated by Toeplitz operators with special symbols. We focus on the subgroup $\mathrm{SO}(n) \times \mathrm{SO}(2)$ of biholomorphisms of $\mathrm{D}_n^{\mathrm{IV}}$ that fix the origin. The $\mathrm{SO}(n) \times \mathrm{SO}(2)$-invariant symbols yield Toeplitz operators that generate commutative $C^*$-algebras, but commutativity is lost when we consider sy…
The well know conjecture of {\it Coburn} [{\it L.A. Coburn, {On the Berezin-Toeplitz calculus}, Proc. Amer. Math. Soc. 129 (2001) 3331-3338.}] proved by {\it Lo} [{\it M-L. Lo, {The Bargmann Transform and Windowed Fourier Transform}, Integr. equ. oper. theory, 27 (2007), 397-412.}] and {\it Englis} [{\it M. Engli$\check{s}$, Toeplitz Operators and Localization Operators, Trans. Am. Math Society 361 (2009) 1039-1052.}] states that any {\it Gabor-Daubechies} operator with window $ψ$ and symbol ${\bf a}(x,ω)$ quantized on the phase space by a {\it Berezin-Toeplitz} operator with window $Ψ$ and sy…
Quantum harmonic analysis for polyanalytic Fock spaces
本研究构建可约情形下的量子调和分析框架并应用于多解析Fock空间，解释了已有文献中的观测现象、解答相关开放问题，推导Toeplitz量子化核的显式刻画，证明Berezin变换的单射性，并给出$\u2702_1$-代数的多种刻画。
Commutative $G$-invariant Toeplitz C$^\ast$ algebras on the Fock space and their Gelfand theory through Quantum Harmonic Analysis
本文基于量子调和分析中的谱综合概念，研究了具有特定不变符号的 Toeplitz 代数子代数及其交换子，发现了一类新的 Fock 空间上的交换 Toeplitz C$^\ast$ 代数，并探讨了其 Gelfand 理论。
A family $\{T_j\}_{j\in J}$ of commuting Hilbert space operators is said to be a spherical isometry if $\sum_{j\in J}T^*_jT_j=1$ in the weak operator topology. We show that every commuting family $\Cal F$ of spherical isometries has a commuting normal extension $\hat{\Cal F}$. Moreover, if $\hat{\Cal F}$ is minimal, then there exists a natural short exact sequence $0\to\Cal C\to C^*(\Cal F)\to C^*(\hat{\Cal F})\to 0$ with a completely isometric cross-section, where $\Cal C$ is the commutator ideal in $C^*(\Cal F)$. We also show that the space of Toeplitz operators associated to $\Cal F$ is com…
For $1 < p < \infty$ let $\mathcal{T}_p ^α$ be the norm closure of the algebra generated by Toeplitz operators with bounded symbols acting on the standard weighted Fock space $F_α^p$. In this paper, we will show that an operator $A$ is compact on $F_α^p$ if and only if $A \in \mathcal{T}_p ^α$ and the Berezin transform $B_α(A)$ of $A$ vanishes at infinity.
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