Coherent excitation of materials via ultrafast laser pulses can have interesting, observable dynamics in time-resolved photoemission measurements. The broad spectral width of ultrafast pump pulses can coherently excite multiple exciton energy levels. When such coherently excited states are probed by means of photoemission spectroscopy, interference between the polarization of different exciton levels can lead to observable coherent exciton beats. Here, we present the theoretical formalism for evaluating the Time- and Angle- Resolved Photoemission Spectra (tr-ARPES) arising from the coherently excited exciton states. We subsequently apply our formalism to a simple model example of hydrogenic exciton energy levels to identify the dependencies that control the quantum beats. Our findings indicate that the most pronounced effect of coherent quantum excitonic beats is seen midway between the excited exciton energy levels and the central energy of the pump pulse provides tunability of this effect.
Exchange-controlled quantum beats and entanglement in an exciton--bimodal-cavity system
Federal University of Santa Maria（圣玛丽亚联邦大学）；Universidad Privada del Norte（北方私立大学）；Institute for Basic Science (IBS)（基础科学研究院）；Ewha Womans University（梨花女子大学）
Quasi-steady electron-excitonic complexes coupling in a two-dimensional semiconductor
Institute for Advanced Studies, Wuhan University（武汉大学高等研究院）；Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences（中国科学院物理研究所和凝聚态物理北京国家实验室）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；Songshan Lake Materials Laboratory（松山湖材料实验室）；Wuhan Institute of Quantum Technology（武汉量子技术研究院）
The role of non-equilibrium populations in dark exciton formation
Georg-August-Universität Göttingen（哥廷根大学）；Philipps-Universität（菲利普斯大学）；University of Cambridge（剑桥大学）；King Fahd University of Petroleum & Minerals (KFUPM)（法赫德国王石油与矿物大学）；National Institute for Materials Science（日本物质材料研究机构）
Odd-to-Even-Layer Switch of Spontaneous Excitonic State in $\rm{TiSe_{2}}$ Thin Films
National Laboratory of Solid State Microstructure, School of Physics, Nanjing University（南京大学固体微结构物理学院国家实验室）；Jiangsu Physical Science Research Center, Nanjing University（南京大学江苏省物理科学研究中心）；Hefei National Laboratory（合肥国家实验室）；Quantum Science Center of Guangdong-Hong Kong-Macao Greater Bay Area（粤港澳大湾区量子科学中心）；State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University（清华大学物理系低维量子物理国家重点实验室）；Department of Physics and Guangdong Basic Research Center of Excellence for Quantum Science, Southern University of Science and Technology（南方科技大学物理系广东省量子科学基础研究中心）
Raman spectroscopy of van der Waals topological magnet GdGaI
The University of Osaka（大阪大学）；The University of Tokyo（东京大学）；Chinese Academy of Sciences（中国科学院）；Okinawa Institute of Science and Technology Graduate University（冲绳科学技术大学院大学）；National Institute for Materials Science（国立材料研究所）
Excited state band mapping and momentum-resolved ultrafast population dynamics in In/Si(111) nanowires investigated with XUV based time- and angle-resolved photoemission spectroscopy
ARPES signatures of trions in van der Waals materials
Philipps-Universität Marburg（马尔堡菲利普斯大学）；mar.quest | Marburg Center for Quantum Materials and Sustainable Technologies（mar.quest | 马尔堡量子材料与可持续技术中心）；Stockholm University（斯德哥尔摩大学）；Georg-August-Universität Göttingen（格奥尔格·奥古斯特哥廷根大学）
Spectroscopic signatures of persistent exciton condensation in a bulk magnetic topological insulator
Stanford University（斯坦福大学）；Aarhus University（奥胡斯大学）；Università degli Studi di Trieste（的里雅斯特大学）；Elettra - Sincrotrone Trieste S.C.p.A.（Elettra-的里雅斯特同步辐射中心）；Tohoku University（东北大学）；Technical University of Denmark（丹麦技术大学）
