<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mi>N</mml:mi><mml:mi>K</mml:mi></mml:mrow></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mi>Δ</mml:mi><mml:mi>K</mml:mi></mml:mrow></mml:mrow></mml:math>states in the chiral<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mrow><mml:mi mathvariant="normal">SU</mml:mi><mml:mrow><mml:mo>(</mml:mo>

Huang, F.; Zhang, Z. Y.

doi:10.1103/physrevc.70.064004

Cited by 66 publications

(127 citation statements)

References 23 publications

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“…Within this framework, various di-hadron bound states were investigated such as ∆∆ [357], ΩΩ [358], NΩ [359], ∆K [360,361], Nφ [362], ΣK [363], Ωπ [364], and Ωω [365].…”

Section: Chiral Quark Modelmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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In the past decade many charmonium-like states were observed experimentally. Especially those charged charmoniumlike Z c states and bottomonium-like Z b states can not be accommodated within the naive quark model. These charged Z c states are good candidates of either the hidden-charm tetraquark states or molecules composed of a pair of charmed mesons. Recently, the LHCb Collaboration discovered two hidden-charm pentaquark states, which are also beyond the quark model. In this work, we review the current experimental progress and investigate various theoretical interpretations of these candidates of the multiquark states. We list the puzzles and theoretical challenges of these models when confronted with the experimental data. We also discuss possible future measurements which may distinguish the theoretical schemes on the underlying structures of the hidden-charm multiquark states.

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“…Within this framework, various di-hadron bound states were investigated such as ∆∆ [357], ΩΩ [358], NΩ [359], ∆K [360,361], Nφ [362], ΣK [363], Ωπ [364], and Ωω [365].…”

Section: Chiral Quark Modelmentioning

confidence: 99%

The hidden-charm pentaquark and tetraquark states

et al. 2016

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“…The chiral SU(3) quark model has been widely described in the literature [11,12] and we refer the reader to those works for details. Here we just give the salient features of the extended chiral SU (3) …”

Section: Formulation a Modelmentioning

confidence: 99%

“…The mixing angle θ S is an open issue because the structure of the σ meson is still unclear and controversial. We adopt two possible values as in our previous works [11,12], one is 35.264 • which means that σ and f 0 [In our previous works f 0 was named ǫ and a 0 was named σ ′ ] are ideally mixed by σ 0 and σ 8 , and the other is −18 • which is provided by Dai and Wu based on their recent investigation of a dynamically spontaneous symmetry breaking mechanism [27]. In both of these two cases, the attraction of the σ meson can be reduced a lot, and thus we can get reasonable S-wave KN phase shifts.…”

Section: Formulation a Modelmentioning

confidence: 99%

“…In our previous works [11,12], we dynamically studied the S-, P -, D-, and F -wave KN phase shifts by performing a RGM calculation. Comparing with Ref.…”

Section: Introductionmentioning

confidence: 99%

“…As we did in Refs. [11,12], the mass of the σ meson is taken to be 675 MeV and the mixing of σ 0 (scalar singlet) and σ 8 (scalar iso-scalar) is considered.…”

Section: Introductionmentioning

confidence: 99%

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Kaon-nucleon interaction in the extended chiral SU(3) quark model

Huang

Zhang

2005

Phys. Rev. C

Self Cite

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The chiral SU(3) quark model is extended to include the coupling between the quark and vector chiral fields. The one-gluon exchange (OGE) which dominantly governs the short-range quarkquark interaction in the original chiral SU(3) quark model is now nearly replaced by the vectormeson exchange. Using this model, the isospin I = 0 and I = 1 kaon-nucleon S, P , D, F wave phase shifts are dynamically studied by solving the resonating group method (RGM) equation. Similar to those given by the original chiral SU(3) quark model, the calculated results for many partial waves are consistent with the experiment, while there is no improvement in this new approach for the P 13 and D 15 channels, of which the theoretical phase shifts are too much repulsive and attractive respectively when the laboratory momentum of the kaon meson is greater than 300 MeV.

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Competition between Free Carriers and Excitons Mediated by Defects Observed in Layered WSe₂ Crystal with Time‐Resolved Terahertz Spectroscopy

Zhu

Zhao

et al. 2018

Advanced Optical Materials

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are new types of semiconductors in which adjacent layers are held by van der Waals force. [1] TMDs have many rich physical properties such as extremely weak phonon-assisted photoluminescence (PL) in bulk structures, relatively strong PL yield in monolayer structures, [2][3][4][5] strong valley-dependent absorption in visible range, [6][7][8] and strong nonlinear optical response. [9][10][11][12] By taking advantage of these properties, significant progresses have been made in the development of electronic and optoelectronic technologies by these materials, [13,14] such as photodetectors, [15] field-effect transistors, [16][17][18] solar cells, [19,20] light-emitting diodes, [21,22] valleytronics, [8,23] integrated circuits, [24] and so on.The exciton binding energy in the monolayer TMDs has been observed in the range of 0.1-1.1 eV, [25][26][27][28] which is larger than that in traditional bulk semiconductors and traditional quantum well. [29,30] This rich excitonic state makes it possible to observe the complex exciton dynamics at room temperature, [31] such as charged and neutral phase of carriers, [32] trions, [33] and biexciton. [34] Meanwhile, bounded exciton could not only dominate the optical response but also play an important role in the optoelectronic processes, such as photocurrent generation and photoconduction in TMD semiconductors. [33,35,36] As a typical TMD material, the bulk WSe 2 has an indirect bandgap of 1.2 eV, and it would transform to the ≈1.65 eV direct bandgap as decreasing to monolayer. [37,38] WSe 2 has been widely used in optoelectronic devices due to its high absorption coefficients in the visible range. Field-effect transistors based on single crystal WSe 2 have been achieved and a carrier mobility comparable to silicon at room temperature was demonstrated. [39] Besides, WSe 2 can also play an important role in the development of van der Waals heterostructures, [40][41][42] in which long-lived interlayer excitons have been observed.Recently, ultrafast time-resolved photoexcited carrier dynamics has been studied in layered TMDs by the most widely used tools, such as optical-pump optical-probe spectroscopy, [43] PL spectroscopy, [38] photocurrent spectroscopy, [36] and electroluminescence. [35,44] The prevalentThe dynamics of photoexcited species is quite important for the development of next-generation ultrafast optoelectronic devices based on transition metal dichalcogenides (TMDs). Herein, time-resolved optical pump terahertz (THz) probe spectroscopy, which is sensitive to both bounded excitons and free electrons/holes, is employed to study the dynamics of photo-induced carriers in the typical layered TMDs crystal tungsten diselenide (WSe 2 ). Initial photoexcitation could generate both free carriers and excitons. The free carriers decay followed by phonon-assistance (≈30 ps) and defect-assistance (≈200-280 ps). The excitons decay followed by the phonon-assisted recombination (≈100 ps) and the defect-induced exciton separation (≈40-200 ps). With the increasing of pump fluence, more f...

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NKandΔKstates in the chiralSU(

Cited by 66 publications

References 23 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Kaon-nucleon interaction in the extended chiral SU(3) quark model

Competition between Free Carriers and Excitons Mediated by Defects Observed in Layered WSe₂ Crystal with Time‐Resolved Terahertz Spectroscopy

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NKandΔKstates in the chiralSU(

Cited by 66 publications

References 23 publications

The hidden-charm pentaquark and tetraquark states

The hidden-charm pentaquark and tetraquark states

Kaon-nucleon interaction in the extended chiral SU(3) quark model

Competition between Free Carriers and Excitons Mediated by Defects Observed in Layered WSe2 Crystal with Time‐Resolved Terahertz Spectroscopy

Contact Info

Product

Resources

About

Competition between Free Carriers and Excitons Mediated by Defects Observed in Layered WSe₂ Crystal with Time‐Resolved Terahertz Spectroscopy