Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-valley lifetimes in a silicon quantum dot with tunable valley
  splitting   Although silicon is a promising material for quantum computation, the
degeneracy of the conduction band minima (valleys) must be lifted with a
splitting sufficient to ensure formation of well-defined and long-lived spin
qubits. Here we demonstrate that valley separation can be accurately tuned via
electrostatic gate control in a metal-oxide-semiconductor quantum dot,
providing splittings spanning 0.3 - 0.8 meV. The splitting varies linearly with
applied electric field, with a ratio in agreement with atomistic tight-binding
predictions. We demonstrate single-shot spin readout and measure the spin
relaxation for different valley configurations and dot occupancies, finding
one-electron lifetimes exceeding 2 seconds. Spin relaxation occurs via phonon
emission due to spin-orbit coupling between the valley states, a process not
previously anticipated for silicon quantum dots. An analytical theory describes
the magnetic field dependence of the relaxation rate, including the presence of
a dramatic rate enhancement (or hot-spot) when Zeeman and valley splittings
coincide.

20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs
16
The categories of this paper are: stat
23
The categories of this paper are: solv-int
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
24
The categories of this paper are: dg-ga
6
The categories of this paper are: astro-ph
14
The categories of this paper are: math-ph
0
The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an