Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Observation of the possible chiral edge mode in Bi1-xSbx   After the classification of topological states of matter has been clarified
for non-interacting electron systems, the theoretical connection between
gapless boundary modes and nontrivial bulk topological structures, and their
evolutions as a function of dimensions are now well understood. However, such
dimensional hierarchy has not been well established experimentally although
some indirect evidences were reported, for example, such as the half-quantized
Hall conductance via quantum Hall effect and extrapolation in the
quantum-oscillation measurement. In this paper, we report the appearance of the
possible chiral edge mode from the surface state of topological insulators
under magnetic fields, confirming the dimensional hierarchy in three
dimensional topological insulators. Applying laser pulses to the surface state
of Bi1-xSbx, we find that the sign of voltage relaxation in one edge becomes
opposite to that in the other edge only when magnetic fields are applied to the
topological insulating phase. We show that this sign difference originates from
the chirality of edge states, based on coupled time-dependent Poisson and
Boltzmann equations.

15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
30
The categories of this paper are: q-alg
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
28
The categories of this paper are: alg-geom
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
2
The categories of this paper are: math