Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Step-Bunching Transitions on Vicinal Surfaces and Quantum n-mers   We study vicinal crystal surfaces within the terrace-step-kink model on a
discrete lattice. Including both a short-ranged attractive interaction and a
long-ranged repulsive interaction arising from elastic forces, we discover a
series of phases in which steps coalesce into bunches of $n_b$ steps each. The
value of $n_b$ varies with temperature and the ratio of short to long range
interaction strengths. For bunches with large number of steps, we show that, at
T=0, our bunch phases correspond to the well known periodic groove structure
first predicted by Marchenko. An extension to $T>0$ is developed. We propose
that the bunch phases have been observed in very recent experiments on Si
surfaces, and further experiments are suggested. Within the context of a
mapping of the model to a system of bosons on a 1D lattice, the bunch phases
appear as quantum n-mers.

31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
2
The categories of this paper are: math
24
The categories of this paper are: dg-ga
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
34
The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th