scholarly journals Persistent coherence of quantum superpositions in an optimally doped cuprate revealed by 2D spectroscopy

2020 ◽  
Vol 6 (9) ◽  
pp. eaaw9932 ◽  
Author(s):  
Fabio Novelli ◽  
Jonathan O. Tollerud ◽  
Dharmalingam Prabhakaran ◽  
Jeffrey A. Davis
Keyword(s):  
Energy Range ◽  
Electronic Properties ◽  
Excited States ◽  
Quantum Coherence ◽  
Complex Materials ◽  
Many Body ◽  
Quantum Superposition ◽  
Coherent Spectroscopy ◽  
Quantum Materials ◽  
Future Technologies

Quantum materials displaying intriguing magnetic and electronic properties could be key to the development of future technologies. However, it is poorly understood how the macroscopic behavior emerges in complex materials with strong electronic correlations. While measurements of the dynamics of excited electronic populations have been able to give some insight, they have largely neglected the intricate dynamics of quantum coherence. Here, we apply multidimensional coherent spectroscopy to a prototypical cuprate and report unprecedented coherent dynamics persisting for ~500 fs, originating directly from the quantum superposition of optically excited states separated by 20 to 60 meV. These results reveal that the states in this energy range are correlated with the optically excited states at ~1.5 eV and point to nontrivial interactions between quantum many-body states on the different energy scales. In revealing these dynamics and correlations, we demonstrate that multidimensional coherent spectroscopy can interrogate complex quantum materials in unprecedented ways.

The Importance of Photodissociative Trichloromethanol for Atmospheric Chemistry

2003 ◽  
Vol 68 (12) ◽  
pp. 2297-2308 ◽  
Author(s):  
Max Mühlhäuser ◽  
Melanie Schnell ◽  
Sigrid D. Peyerimhoff
Keyword(s):  
Energy Range ◽  
Excited States ◽  
Atmospheric Chemistry ◽  
Configuration Interaction ◽  
Configuration Interaction Calculations

Multireference configuration interaction calculations are carried out for ground and excited states of trichloromethanol to investigate two important photofragmentation processes relevant to atmospheric chemistry. For CCl3OH five low-lying excited states in the energy range between 6.1 and 7.1 eV are found to be highly repulsive for C-Cl elongation leading to Cl2COH (X2A') and Cl (X2P). Photodissociation along C-O cleavage resulting in Cl3C (X2A') and OH (X2Π) has to overcome a barrier of about 0.8 eV (13A'', 11A'') and 1.2 eV (13A') because the low-lying excited states 11A'', 13A' and 13A'' become repulsive only after elongating the C-O bond by about 0.3 Å.

scholarly journals Erratum: Diabatic-ramping spectroscopy of many-body excited states [Phys. Rev. A 90 , 062334 (2014)]

2017 ◽  
Vol 96 (3) ◽  
Author(s):  
Bryce Yoshimura ◽  
W. C. Campbell ◽  
J. K. Freericks
Keyword(s):  
Excited States ◽  
Many Body

scholarly journals Exciton-polaron Rydberg states in monolayer MoSe2 and WSe2

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Erfu Liu ◽  
Jeremiah van Baren ◽  
Zhengguang Lu ◽  
Takashi Taniguchi ◽  
Kenji Watanabe ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Excited States ◽  
Ground State ◽  
Transition Metal Dichalcogenides ◽  
Rydberg States ◽  
Energy Shift ◽  
Many Body ◽  
Electron Hole ◽  
Metal Dichalcogenides ◽  
Excitonic States

AbstractExciton polaron is a hypothetical many-body quasiparticle that involves an exciton dressed with a polarized electron-hole cloud in the Fermi sea. It has been evoked to explain the excitonic spectra of charged monolayer transition metal dichalcogenides, but the studies were limited to the ground state. Here we measure the reflection and photoluminescence of monolayer MoSe2 and WSe2 gating devices encapsulated by boron nitride. We observe gate-tunable exciton polarons associated with the 1 s–3 s exciton Rydberg states. The ground and excited exciton polarons exhibit comparable energy redshift (15~30 meV) from their respective bare excitons. The robust excited states contradict the trion picture because the trions are expected to dissociate in the excited states. When the Fermi sea expands, we observe increasingly severe suppression and steep energy shift from low to high exciton-polaron Rydberg states. Their gate-dependent energy shifts go beyond the trion description but match our exciton-polaron theory. Our experiment and theory demonstrate the exciton-polaron nature of both the ground and excited excitonic states in charged monolayer MoSe2 and WSe2.

scholarly journals Capturing excitonic and polaronic effects in lead iodide perovskites from many-body perturbation theory

2021 ◽  
Author(s):  
Pooja Basera ◽  
Arunima Singh ◽  
Deepika Gill ◽  
Saswata Bhattacharya
Keyword(s):  
Optical Properties ◽  
Perturbation Theory ◽  
Binding Energy ◽  
Electronic Properties ◽  
Effective Mass ◽  
Exciton Binding Energy ◽  
Many Body ◽  
Energy Materials ◽  
Lead Iodide ◽  
Many Body Perturbation Theory

Lead iodide perovskites have attracted considerable interest as promising energy-materials. However, till date, several key electronic properties such as optical properties, effective mass, exciton binding energy and the radiative exciton...

scholarly journals Quantum Computers - An Emerging Cybersecurity Threat

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Dajana Jelčić Dubček
Keyword(s):  
Information Processing ◽  
Quantum Coherence ◽  
Quantum Physics ◽  
Quantum Computers ◽  
Practical Implementation ◽  
Quantum Superposition ◽  
Processing And Storage ◽  
And Storage ◽  
Superposition Of States

Quantum computational supremacy may potentially endanger the current cryptographic protection methods. Although quantum computers are still far from a practical implementation in information processing and storage, they should not be overlooked in the context of cybersecurity. Quantum computers operate with qubits - units of information that are governed by the fundamental principles of quantum physics, such as quantum superposition of states and quantum coherence. In order to address the new challenge that quantum computers pose to cybersecurity, the very principles of their operation have to be understood and are overviewed in this contribution.

Charge-Transfer Excited States in Aqueous DNA: Insights from Many-Body Green’s Function Theory

2014 ◽  
Vol 112 (22) ◽  
Author(s):  
Huabing Yin ◽  
Yuchen Ma ◽  
Jinglin Mu ◽  
Chengbu Liu ◽  
Michael Rohlfing
Keyword(s):  
Charge Transfer ◽  
Green’S Function ◽  
Excited States ◽  
Green's Function ◽  
Function Theory ◽  
Many Body

On excited states of the Au3 cluster: an ab initio study

Open Physics ◽  
2008 ◽  
Vol 6 (4) ◽  
Author(s):  
Alexander Rusakov ◽  
André Zaitsevskii
Keyword(s):  
Excited States ◽  
Spectroscopic Data ◽  
Reasonable Agreement ◽  
Dipole Moments ◽  
Electronic States ◽  
Ab Initio Study ◽  
Many Body ◽  
Transition Energies ◽  
Vertical Transition ◽  
Theoretical Results

AbstractExcited electronic states of the Au3 cluster are studied within the shape-consistent small-core relativistic pseudopotential model using many-body multipartitioning perturbation theory. Vertical transition energies and dipole moments are evaluated. For highly symmetric isomer, these theoretical results are in reasonable agreement with spectroscopic data from experiments.

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