707 research outputs found
Bosonization of quantum sine-Gordon field with a boundary
Boundary operators and boundary ground states in sine-Gordon model with a
fixed boundary condition are studied using bosonization and q-deformed
oscillators.We also obtain the form-factors of this model.Comment: Latex 25page
Tailoring excitonic states of van der Waals bilayers through stacking configuration, band alignment and valley-spin
Excitons in monolayer semiconductors have large optical transition dipole for
strong coupling with light field. Interlayer excitons in heterobilayers, with
layer separation of electron and hole components, feature large electric dipole
that enables strong coupling with electric field and exciton-exciton
interaction, at the cost that the optical dipole is substantially quenched (by
several orders of magnitude). In this letter, we demonstrate the ability to
create a new class of excitons in transition metal dichalcogenide (TMD) hetero-
and homo-bilayers that combines the advantages of monolayer- and
interlayer-excitons, i.e. featuring both large optical dipole and large
electric dipole. These excitons consist of an electron that is well confined in
an individual layer, and a hole that is well extended in both layers, realized
here through the carrier-species specific layer-hybridization controlled
through the interplay of rotational, translational, band offset, and
valley-spin degrees of freedom. We observe different species of such
layer-hybridized valley excitons in different heterobilayer and homobilayer
systems, which can be utilized for realizing strongly interacting
excitonic/polaritonic gases, as well as optical quantum coherent controls of
bidirectional interlayer carrier transfer either with upper conversion or down
conversion in energy
Landau-Zener-St\"{u}ckelberg Interference of Microwave Dressed States of a Superconducting Phase Qubit
We present the first observation of Landau-Zener-St\"{u}ckelberg (LZS)
interference of the dressed states arising from an artificial atom, a
superconducting phase qubit, interacting with a microwave field. The dependence
of LZS interference fringes on various external parameters and the initial
state of the qubit agrees quantitatively very well with the theoretical
prediction. Such LZS interferometry between the dressed states enables us to
control the quantum states of a tetrapartite solid-state system with ease,
demonstrating the feasibility of implementing efficient multipartite quantum
logic gates with this unique approach.Comment: 6 pages, 3 figures To appear in Physical Review B(R
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