5,380 research outputs found
Chiral topological excitonic insulator in semiconductor quantum wells
We present a scheme to realize the chiral topological excitonic insulator in
semiconductor heterostructures which can be experimentally fabricated with a
coupled quantum well adjacent to twoferromagnetic insulating films. The
different mean-field chiral topological orders, which are due to the change in
the directions of the magnetization of the ferromagnetic films, can be
characterized by the TKNN numbers in the bulk system as well as by the winding
numbers of the gapless states in the edged system. Furthermore, we propose an
experimental scheme to detect the emergence of the chiral gapless edge state
and distinguish different chiral topological orders by measuring the thermal
conductance.Comment: 14 pages, 4 figure
Search for the signal of monotop production at the early LHC
We investigate the potential of the early LHC to discover the signal of
monotops, which can be decay products of some resonances in models such as
R-parity violating SUSY or SU(5), etc. We show how to constrain the parameter
space of the models by the present data of boson hadronic decay branching
ratio, mixing and dijet productions at the LHC. Then, we study
the various cuts imposed on the events, reconstructed from the hadronic final
states, to suppress backgrounds and increase the significance in detail. And we
find that in the hadronic mode the information from the missing transverse
energy and reconstructed resonance mass distributions can be used to specify
the masses of the resonance and the missing particle. Finally, we study the
sensitivities to the parameters at the LHC with =7 TeV and an
integrated luminosity of in detail. Our results show that the
early LHC may detect this signal at 5 level for some regions of the
parameter space allowed by the current data.Comment: 25 pages, 18 figures, 3 tables, version published in Phys.Rev.
Experimental preparation and verification of quantum money
A quantum money scheme enables a trusted bank to provide untrusted users with
verifiable quantum banknotes that cannot be forged. In this work, we report an
experimental demonstration of the preparation and verification of unforgeable
quantum banknotes. We employ a security analysis that takes experimental
imperfections fully into account. We measure a total of states
in one verification round, limiting the forging probability to based
on the security analysis. Our results demonstrate the feasibility of preparing
and verifying quantum banknotes using currently available experimental
techniques.Comment: 12 pages, 4 figure
Research and Application of Workflow-Based Internal Control System of Tendering and Procurement
Aiming at the management of internal control of tendering and procurement in colleges and universities, learning from the management experience of internal control of tendering and procurement in domestic universities, based on the establishment of the tendering and procurement information management system, through sorting and optimization process, a SBMN internal control matrix based on rendering and procurement and processing was proposed. An internal control program based on the TFSP dimension was also developed, achieving real-time monitoring, risk assessment and early warning of abnormal activities of the rendering and procurement and processing in colleges and universities. Currently, this research have been applied to the tendering and procurement management system of domestic universities and achieved good results.Aiming at the management of internal control of tendering and procurement in colleges and universities, learning from the management experience of internal control of tendering and procurement in domestic universities, based on the establishment of the tendering and procurement information management system, through sorting and optimization process, a SBMN internal control matrix based on rendering and procurement and processing was proposed. An internal control program based on the TFSP dimension was also developed, achieving real-time monitoring, risk assessment and early warning of abnormal activities of the rendering and procurement and processing in colleges and universities. Currently, this research have been applied to the tendering and procurement management system of domestic universities and achieved good results
Anomalous boundary correspondence of topological phases
Topological phases protected by crystalline symmetries and internal
symmetries are shown to enjoy fascinating one-to-one correspondence in
classification. Here we investigate the physics content behind the abstract
correspondence in three or higher-dimensional systems. We show correspondence
between anomalous boundary states, which provides a new way to explore the
quantum anomaly of symmetry from its crystalline equivalent counterpart. We
show such correspondence directly in two scenarios, including the anomalous
symmetry-enriched topological orders (SET) and critical surface states. (1)
First of all, for the surface SET correspondence, we demonstrate it by
considering examples involving time-reversal symmetry and mirror symmetry. We
show that one 2D topological order can carry the time reversal anomaly as long
as it can carry the mirror anomaly and vice versa, by directly establishing the
mapping of the time reversal anomaly indicators and mirror anomaly indicators.
Besides, we also consider other cases involving continuous symmetry, which
leads us to introduce some new anomaly indicators for symmetry from its
counterpart. (2) Furthermore, we also build up direct correspondence for (near)
critical boundaries. Again taking topological phases protected by time reversal
and mirror symmetry as examples, the direct correspondence of their (near)
critical boundaries can be built up by coupled chain construction that was
first proposed by Senthil and Fisher. The examples of critical boundary
correspondence we consider in this paper can be understood in a unified
framework that is related to \textit{hierarchy structure} of topological
nonlinear sigma model, that generalizes the Haldane's derivation of
sigma model from spin one-half system.Comment: 17 pages, 5 figure
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