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Showing 1–9 of 9 results

Advanced filters: Author: Valentin Walther Clear advanced filters

Optical signatures of interlayer electron coherence in a bilayer semiconductor

Condensates of excitons have been observed in the quantum Hall regime, but evidence for their existence at low magnetic fields remains controversial. Now evidence of coherence between optically pumped interlayer excitons in MoS₂ marks a step towards confirming exciton condensation at low magnetic fields.

Xiaoling Liu
Nadine Leisgang
Mikhail D. Lukin
ResearchOpen Access20 Aug 2025
Nature Physics

P: 1-7
Superradiant and subradiant states in lifetime-limited organic molecules through laser-induced tuning

Laser-induced tuning of pairs of lifetime-limited organic emitters allows the controlled creation of superradiant and subradiant entangled states.

Christian M. Lange
Emma Daggett
Jonathan D. Hood
Research19 Feb 2024
Nature Physics

Volume: 20, P: 836-842
Asymmetric Rydberg blockade of giant excitons in Cuprous Oxide

Previous research showed the existence of Rydberg excitons with large principle quantum numbers in Cu₂O. Here, by using two-color pump-probe optical spectroscopy, the authors demonstrate the generation and control of long-range correlations between these giant Rydberg excitons, leading to exciton blockade.

Julian Heckötter
Valentin Walther
Marc Aßmann
ResearchOpen Access11 Jun 2021
Nature Communications

Volume: 12, P: 1-6
Giant optical nonlinearities from Rydberg excitons in semiconductor microcavities

Strong optical nonlinearities in polariton systems open up experiments on quantum-correlated states of light. Here, Walther et al. study Rydberg excitons inside a cavity and show how enhanced nonlinearities could be achieved in such systems.

Valentin Walther
Robert Johne
Thomas Pohl
ResearchOpen Access03 Apr 2018
Nature Communications

Volume: 9, P: 1-6
Rydberg exciton–polaritons in a Cu₂O microcavity

Cu₂O is a promising platform to host Rydberg exciton–polaritons, where excitons strongly couple to cavity photons, however their realization has been elusive. Here, the authors report Rydberg exciton–polaritons with principal quantum numbers up to n = 6.

Konstantinos Orfanakis
Sai Kiran Rajendran
Hamid Ohadi
Research14 Apr 2022
Nature Materials

Volume: 21, P: 767-772
Large scale purification in semiconductors using Rydberg excitons

Charged impurities are a major source of charge noise in semiconductors. Here, using pump-probe time-resolved relative transmission measurements on cuprous oxide, the authors demonstrate a strategy for mitigating charged impurities by injection and subsequent breakdown of Rydberg excitons.

Martin Bergen
Valentin Walther
Marc Aßmann
ResearchOpen Access12 Dec 2023
Nature Communications

Volume: 14, P: 1-11
Enhanced nonlinear interaction of polaritons via excitonic Rydberg states in monolayer WSe₂

Here, the authors show the formation of exciton-polaritons with enhanced nonlinear response using excited excitonic Rydberg states in monolayer WSe₂ embedded in a microcavity.

Jie Gu
Valentin Walther
Vinod M. Menon
ResearchOpen Access15 Apr 2021
Nature Communications

Volume: 12, P: 1-7
Sex-specific outcome disparities in very old patients admitted to intensive care medicine: a propensity matched analysis

Bernhard Wernly
Raphael Romano Bruno
Christian Jung
ResearchOpen Access29 Oct 2020
Scientific Reports

Volume: 10, P: 1-9
Publisher Correction: Sex-specific outcome disparities in very old patients admitted to intensive care medicine: a propensity matched analysis

Bernhard Wernly
Raphael Romano Bruno
Christian Jung
Amendments and CorrectionsOpen Access05 Jul 2021
Scientific Reports

Volume: 11, P: 1