scholarly journals Confinement of long-lived interlayer excitons in WS2/WSe2 heterostructures

2021 ◽  
Vol 4 (1) ◽  
Author(s):  
Alejandro R.-P. Montblanch ◽  
Dhiren M. Kara ◽  
Ioannis Paradisanos ◽  
Carola M. Purser ◽  
Matthew S. G. Feuer ◽  
...  
Keyword(s):  
Optical Lattices ◽  
Emission Rate ◽  
Many Body ◽  
Patterned Substrate ◽  
Periodic Arrays ◽  
High Particle ◽  
Quantum Particles ◽  
Long Range Interactions ◽  
Long Lifetime ◽  
Temporally Correlated

AbstractInterlayer excitons in layered materials constitute a novel platform to study many-body phenomena arising from long-range interactions between quantum particles. Long-lived excitons are required to achieve high particle densities, to mediate thermalisation, and to allow for spatially and temporally correlated phases. Additionally, the ability to confine them in periodic arrays is key to building a solid-state analogue to atoms in optical lattices. Here, we demonstrate interlayer excitons with lifetime approaching 0.2 ms in a layered-material heterostructure made from WS2 and WSe2 monolayers. We show that interlayer excitons can be localised in an array using a nano-patterned substrate. These confined excitons exhibit microsecond-lifetime, enhanced emission rate, and optical selection rules inherited from the host material. The combination of a permanent dipole, deterministic spatial confinement and long lifetime places interlayer excitons in a regime that satisfies one of the requirements for simulating quantum Ising models in optically resolvable lattices.

QLB for Quantum Many-Body and Quantum Field Theory

2018 ◽  
Author(s):  
Sauro Succi
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Quantum Mechanics ◽  
Quantum Computing ◽  
Single Particle ◽  
Body Problem ◽  
Three Dimensions ◽  
Quantum Field ◽  
Many Body ◽  
Quantum Particles

Chapter 32 expounded the basic theory of quantum LB for the case of relativistic and non-relativistic wavefunctions, namely single-particle quantum mechanics. This chapter goes on to cover extensions of the quantum LB formalism to the overly challenging arena of quantum many-body problems and quantum field theory, along with an appraisal of prospective quantum computing implementations. Solving the single particle Schrodinger, or Dirac, equation in three dimensions is a computationally demanding task. This task, however, pales in front of the ordeal of solving the Schrodinger equation for the quantum many-body problem, namely a collection of many quantum particles, typically nuclei and electrons in a given atom or molecule.

scholarly journals Experimentally Accessible Witnesses of Many-Body Localization

2019 ◽  
Vol 1 (1) ◽  
pp. 50-62 ◽  
Author(s):  
Marcel Goihl ◽  
Mathis Friesdorf ◽  
Albert H. Werner ◽  
Winton Brown ◽  
Jens Eisert
Keyword(s):  
Statistical Physics ◽  
Optical Lattices ◽  
Cold Atoms ◽  
Quantum Statistical Mechanics ◽  
Quantum Systems ◽  
Many Body ◽  
Physical Systems ◽  
Tensor Network ◽  
Distinct Features ◽  
Flight Measurements

The phenomenon of many-body localized (MBL) systems has attracted significant interest in recent years, for its intriguing implications from a perspective of both condensed-matter and statistical physics: they are insulators even at non-zero temperature and fail to thermalize, violating expectations from quantum statistical mechanics. What is more, recent seminal experimental developments with ultra-cold atoms in optical lattices constituting analog quantum simulators have pushed many-body localized systems into the realm of physical systems that can be measured with high accuracy. In this work, we introduce experimentally accessible witnesses that directly probe distinct features of MBL, distinguishing it from its Anderson counterpart. We insist on building our toolbox from techniques available in the laboratory, including on-site addressing, super-lattices, and time-of-flight measurements, identifying witnesses based on fluctuations, density–density correlators, densities, and entanglement. We build upon the theory of out of equilibrium quantum systems, in conjunction with tensor network and exact simulations, showing the effectiveness of the tools for realistic models.

scholarly journals Finite-Size Error in Many-Body Simulations with Long-Range Interactions

2006 ◽  
Vol 97 (7) ◽  
Author(s):  
Simone Chiesa ◽  
David M. Ceperley ◽  
Richard M. Martin ◽  
Markus Holzmann
Keyword(s):  
Long Range ◽  
Finite Size ◽  
Many Body ◽  
Long Range Interactions

scholarly journals A glimpse of quantum phenomena in optical lattices

2012 ◽  
Vol 370 (1969) ◽  
pp. 2916-2929 ◽  
Author(s):  
Smitha Vishveshwara
Keyword(s):  
Optical Lattices ◽  
Periodic Potential ◽  
Hexagonal Lattice ◽  
Atomic Gases ◽  
Many Body ◽  
Atomic Systems ◽  
Lattice Quantum ◽  
Disorder Potential ◽  
Quantum Phenomena ◽  
Potential Landscape

Optical lattices in cold atomic systems offer an excellent setting for realizing quantum condensed matter phenomena. Here, a glimpse of such a setting is provided for the non-specialist. Some basic aspects of cold atomic gases and optical lattices are reviewed. Quantum many-body physics is explored in the case of interacting bosons on a lattice. Quantum behaviour in the presence of a potential landscape is examined for three different cases: a hexagonal lattice potential, a quasi-periodic potential and a disorder potential.

scholarly journals Quantum gas magnifier for sub-lattice-resolved imaging of 3D quantum systems

Nature ◽  
2021 ◽  
Vol 599 (7886) ◽  
pp. 571-575
Author(s):  
Luca Asteria ◽  
Henrik P. Zahn ◽  
Marcel N. Kosch ◽  
Klaus Sengstock ◽  
Christof Weitenberg
Keyword(s):  
Optical Imaging ◽  
Optical Lattices ◽  
Quantum Simulation ◽  
Matter Wave ◽  
Single Atom ◽  
Optical Traps ◽  
Quantum Gas ◽  
Many Body ◽  
Small Depth ◽  
Lattice Resolution

AbstractImaging is central to gaining microscopic insight into physical systems, and new microscopy methods have always led to the discovery of new phenomena and a deeper understanding of them. Ultracold atoms in optical lattices provide a quantum simulation platform, featuring a variety of advanced detection tools including direct optical imaging while pinning the atoms in the lattice1,2. However, this approach suffers from the diffraction limit, high optical density and small depth of focus, limiting it to two-dimensional (2D) systems. Here we introduce an imaging approach where matter wave optics magnifies the density distribution before optical imaging, allowing 2D sub-lattice-spacing resolution in three-dimensional (3D) systems. By combining the site-resolved imaging with magnetic resonance techniques for local addressing of individual lattice sites, we demonstrate full accessibility to 2D local information and manipulation in 3D systems. We employ the high-resolution images for precision thermodynamics of Bose–Einstein condensates in optical lattices as well as studies of thermalization dynamics driven by thermal hopping. The sub-lattice resolution is demonstrated via quench dynamics within the lattice sites. The method opens the path for spatially resolved studies of new quantum many-body regimes, including exotic lattice geometries or sub-wavelength lattices3–6, and paves the way for single-atom-resolved imaging of atomic species, where efficient laser cooling or deep optical traps are not available, but which substantially enrich the toolbox of quantum simulation of many-body systems.

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