Mojun Pan

Nonvolatile optical control of interlayer stacking order in 1T-TaS2

Junde Liu, Pei Liu, Liu Shuan Yang, Sung‐Hoon Lee et autres

Nonvolatile optical manipulation of material properties on demand is a highly sought-after feature in the advancement of future optoelectronic applications. Here, we unravel the nature of the single-laser-pulse induced hidden state in 1 T -TaS 2 by systematically investigating the electronic structure …

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High-resolution optical design of the sub-meV ARPES beamline at the Ultrafast Transient Experimental Facility

Chao Li, Baiqing Lv, Mojun Pan, Bocheng Jiang et autres

The Ultrafast Transient Experimental Facility (UTEF) at Chongqing University is constructing a next-generation angle-resolved photoemission spectroscopy (ARPES) beamline designed to simultaneously achieve sub-meV energy resolution, continuous photon energy tunability (10–40 eV), high photon flux (>10 12 photons s −1 at the sample …

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Multiple topological phases in tetradymite compounds M 2 Te 2 P ( M = Ti , Zr , or Hf)

Mojun Pan, Boxuan Li, Hao Wang, J. D. Liu et autres

Since the advent of time-reversal-invariant topological insulators, the generalization of topology concepts has led to the discovery of a wide range of topological states. These topological states may undergo topological phase transitions (TPTs) accompanied by discontinuous changes in topological invariants. In this …

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Evidence for an Excitonic Insulator State in Ta2Pd3Te5

Jierui Huang, Bei Jiang, Jingyu Yao, Dayu Yan et autres

The excitonic insulator (EI) is an exotic ground state of narrow-gap semiconductors and semimetals arising from spontaneous condensation of electron-hole pairs bound by attractive Coulomb interaction. Despite research on EIs dating back to half a century ago, their existence in real materials …

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Time-resolved ARPES with probe energy of 6.0/7.2 eV and switchable resolution configuration

Mojun Pan, Junde Liu, Famin Chen, Ji Wang et autres

We present a detailed exposition of the design for time- and angle-resolved photoemission spectroscopy using a UV probe laser source that combines the nonlinear effects of β-BaB2O4 and KBe2BO3F2 optical crystals. The photon energy of the probe laser can be switched between …

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Evidence for an Excitonic Insulator State in Ta$_2$Pd$_3$Te$_5$

Jierui Huang, Bei Jiang, Jingyu Yao, Dayu Yan et autres

The excitonic insulator (EI) is an exotic ground state of narrow-gap semiconductors and semimetals arising from spontaneous condensation of electron-hole pairs bound by attractive Coulomb interaction. Despite research on EIs dating back to half a century ago, their existence in real materials …

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Discovery of a Single-Band Mott Insulator in a van der Waals Flat-Band Compound

Shunye Gao, Shuai Zhang, Cuixiang Wang, Shaohua Yan et autres

The fundamental model for understanding Mott insulators is the single-band Hubbard model. An ideal realization of that model arises in Nb${}_{3}$Cl${}_{8}$, proving a powerful system for exploring Mott physics and other correlated states.

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Time-resolved ARPES with probe energy of 6.0/7.2 eV and switchable resolution configuration

Mojun Pan, Junde Liu, Famin Chen, Ji Wang et autres

We present a detailed exposition of the design for time- and angle-resolved photoemission spectroscopy using a UV probe laser source that combines the nonlinear effects of \b{eta}-BaB2O4 and KBe2BO3F2 optical crystals. The photon energy of the probe laser can be switched between …

Time-resolved ARPES with tunable 12–21.6 eV XUV at 400 kHz repetition rate

Famin Chen, Ji Wang, Mojun Pan, Junde Liu et autres

Time-resolved and angle-resolved photoemission spectroscopy (trARPES) is a powerful method to detect the non-equilibrium electronic structure in solid systems. In this study, we report a trARPES apparatus with tunable photon energy selectively among 12, 16.8, and 21.6 eV at a repetition rate …

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High-flux wavelength tunable XUV source in the 12–40.8 eV photon energy range with adjustable energy and time resolution for Tr-ARPES applications

Ji Wang, Famin Chen, Mojun Pan, Siyuan Xu et autres

High-order harmonic generation (HHG) has a broad spectrum covering vacuum ultraviolet to extreme ultraviolet (XUV) bands, which is useful for applications involving material analyses at different information depths. Such an HHG light source is perfect for time- and angle-resolved photoemission spectroscopy. Here, …

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Discovery of a Single-Band Mott Insulator in a van der Waals Flat-Band Compound

Shunye Gao, Shuai Zhang, Cuixiang Wang, Shaohua Yan et autres

The Mott insulator provides an excellent foundation for exploring a wide range of strongly correlated physical phenomena, such as high-temperature superconductivity, quantum spin liquid, and colossal magnetoresistance. A Mott insulator with the simplest degree of freedom is an ideal and highly desirable …

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