Communications Physics,
Journal Year:
2018,
Volume and Issue:
1(1)
Published: Dec. 18, 2018
Abstract
Recently,
we
witnessed
a
tremendous
effort
to
conquer
the
realm
of
acoustics
as
possible
playground
test
with
topologically
protected
sound
wave
propagation.
In
this
article,
review
latest
efforts
explore
waves
topological
states
quantum
matter
in
two-
and
three-dimensional
systems
where
discuss
how
spin
valley
degrees
freedom
appear
highly
novel
ingredients
tailor
flow
form
one-way
edge
modes
defect-immune
acoustic
waves.
Both
from
theoretical
stand
point
based
on
contemporary
experimental
verifications,
summarize
advancements
flourishing
research
frontier
sound.
Reviews of Modern Physics,
Journal Year:
2021,
Volume and Issue:
93(1)
Published: Feb. 24, 2021
Quantum
systems
that
are
coupled
to
an
external
bath
can
often
be
described
in
terms
of
a
non-Hermitian
effective
Hamiltonian.
In
isolated
with
Hermitian
Hamiltonians,
topological
aspects
the
band
structure,
and
resulting
phases,
have
been
interest.
The
combination
two
concepts,
i.e.,
properties
open
systems,
leads
qualitatively
new
effects.
This
review
provides
introduction
these
quantum
mechanical
concepts
their
classical
analogs,
discusses
number
applications
ranging
from
metamaterials
dissipative
cold-atom
systems.
Science,
Journal Year:
2018,
Volume and Issue:
359(6381)
Published: Feb. 1, 2018
Topological
insulators
are
phases
of
matter
characterized
by
topological
edge
states
that
propagate
in
a
unidirectional
manner
is
robust
to
imperfections
and
disorder.
These
attributes
make
insulator
systems
ideal
candidates
for
enabling
applications
quantum
computation
spintronics.
We
propose
concept
exploits
effects
unique
way:
the
laser.
lasers
whose
lasing
mode
exhibits
topologically
protected
transport
without
magnetic
fields.
The
underlying
properties
lead
highly
efficient
laser,
defects
disorder,
with
single-mode
even
at
very
high
gain
values.
laser
alters
current
understanding
interplay
between
disorder
lasing,
same
time
opens
exciting
possibilities
physics,
such
as
gain.
On
technological
side,
provides
route
arrays
semiconductor
operate
one
high-power
coupled
efficiently
into
an
output
port.
Nature Communications,
Journal Year:
2015,
Volume and Issue:
6(1)
Published: Nov. 4, 2015
Topological
states
of
quantum
matter
exhibit
unique
disorder-immune
surface
protected
by
underlying
nontrivial
topological
invariants
the
bulk.
Such
immunity
from
backscattering
makes
or
edge
ideal
carriers
for
both
classical
and
information.
So
far,
matters
have
been
explored
only
in
realms
electronics
photonics,
with
limited
range
bulk
properties
largely
immutable
materials.
These
constraints
thus
impose
severe
performance
trade-offs
experimentally
realizable
topologically
ordered
states.
In
contrast,
phononic
metamaterials
not
provide
access
to
a
much
wider
material
properties,
but
also
allow
temporal
modulation
non-adiabatic
regime.
Here,
first-principles
we
demonstrate
numerically
first
metamaterial
an
elastic-wave
analogue
spin
Hall
effect.
A
dual-scale
crystal
slab
is
used
support
two
effective
spins
phonon
over
broad
bandwidth,
strong
spin-orbit
coupling
realized
breaking
spatial
mirror
symmetry.
By
preserving
polarization
external
load
symmetry,
are
shown
be
robust
against
scattering
discrete
defects
as
well
disorders
continuum.
Our
system
opens
up
possibility
realizing
materials
phonons
static
time-dependent
regimes.
